Savings Goal Calculator
Work out exactly how much to put aside each month to hit a target by a date — and see how much of the work the interest does for you.
A savings goal calculator answers the most practical money question there is: “how much do I need to save each month to reach £X by then?” Whether it’s a £30,000 house deposit in five years, a £6,000 emergency fund, or a holiday, it works backwards from your target and date to the monthly amount you actually need to set aside. The part people overlook is how much interest does the heavy lifting: saving for a £20,000 goal over ten years at 4%, you’d put in only about £16,300 yourself — interest covers the remaining £3,700, so the monthly figure is lower than simply dividing the target by the months. A starting balance shrinks it further, since that money compounds for the whole period. And in the UK, where you keep your savings matters: interest inside an ISA is tax-free, while interest outside one can be taxed above your Personal Savings Allowance, slowing you down. This calculator shows the monthly amount, the total interest, and how a head start or an ISA changes things. To project growth, see the Compound Interest Calculator; to measure a past return, the CAGR Calculator.
Savings goal
Savings plan
Interest and tax
Inflation and mode
Savings goal result
Required monthly saving
Calculating…
Calculating…
Projected balance
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Target gap
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Time to goal
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Interest earned
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Savings tax
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Inflation-adjusted target
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Savings goal — quick lookup
The left table shows the monthly amount needed to reach £10,000 over different timeframes, with and without interest — notice how a longer timeframe slashes the monthly figure. The right shows the monthly amount for some common goals over five years at 4%. The key point: more time, a starting balance, and interest all reduce what you have to put in each month.
| Timeframe | At 0% | At 4% |
|---|---|---|
| 1 year | £833 | £818 |
| 2 years | £417 | £401 |
| 3 years | £278 | £262 |
| 5 years | £167 | £151 |
| Goal | Target | Monthly |
|---|---|---|
| Holiday fund | £5,000 | £75 |
| New car | £15,000 | £226 |
| House deposit | £30,000 | £453 |
| Wedding | £20,000 | £302 |
Left: the monthly amount to reach £10,000 from a zero starting balance, with no interest versus 4% annual interest compounded monthly — interest noticeably lowers the figure over longer periods. Right: monthly saving for common goals over five years at 4%, from a standing start. A starting balance would reduce all of these. Rates are illustrative; actual savings rates vary and change.
How a savings goal calculation works
A savings goal calculator runs compound interest backwards. Instead of asking “what will my saving become?”, it asks “what saving reaches this target?” — and the answer is usually less than you’d guess, because interest quietly contributes alongside you.
Working backwards from the target
You start with three things: your target amount, your timeframe, and the interest rate you expect. The calculator finds the monthly contribution that, compounded over the period, grows to exactly your target. If you also have a starting balance, that lump sum compounds for the whole time too, so it counts for more than its face value and reduces the monthly amount needed. The naive approach — dividing the target by the number of months — ignores interest entirely and overstates what you need.
How much interest does for you
The longer the timeframe, the more interest contributes — and the less you have to. Over a short period, interest barely moves the number: reaching £10,000 in a year needs about £818 a month at 4%, only a fraction less than the £833 with no interest. But over ten years, the effect is large: to reach £20,000 you’d put in around £136 a month — about £16,300 of your own money, with interest providing the other £3,700. Time turns interest from a rounding error into a serious partner.
Why a starting balance counts double
A lump sum you already have works harder than the same amount drip-fed later, because it compounds from day one for the entire timeframe. Saving for a £30,000 house deposit in five years needs about £453 a month from scratch — but if you start with £5,000 already saved, that drops to about £360 a month. The £5,000 head start saves you far more than £5,000 spread over the term, because it earns interest the whole way.
Worked examples
Four scenarios: the house deposit, the head-start effect, interest doing the work, and the UK tax difference an ISA makes.
Scenario 1 · House deposit
£30,000 in five years
Monthly needed: £452.50
Paid in: £27,150 · interest: £2,850
Saving £30,000 for a deposit over five years means putting aside about £453 a month. Over the period you contribute around £27,150 yourself, with interest adding the remaining £2,850 to reach the target. Knowing the exact monthly figure makes the goal concrete — you can see immediately whether it fits your budget, and if it doesn’t, the calculator shows how extending the timeframe or finding a better rate brings it down. A vague “I should save for a deposit” becomes a clear plan.
Scenario 2 · The head start
£5,000 already saved cuts the monthly
From £0: £452.50/mo · from £5,000: £360.41/mo
A £5,000 head start saves £92/mo
A £5,000 starting balance drops the monthly amount from £453 to £360 — saving you about £92 a month, or £5,520 across the five years. That’s more than the £5,000 head start itself, because the lump sum earns interest for the whole period while it sits there. It’s a neat illustration of why getting some money into a goal early matters: every pound you start with compounds longer than a pound you add later, so a head start pulls more than its weight.
Scenario 3 · Interest doing the work
£20,000 in ten years — who pays?
Monthly: £135.82 · you pay in: £16,299
Interest provides: £3,701
Over a longer horizon, interest becomes a genuine contributor. Reaching £20,000 in ten years needs only about £136 a month — across the decade you pay in £16,299, and interest supplies the remaining £3,701. The same target with no interest would demand £167 a month and all £20,000 from your pocket. The lesson: the longer you give a goal, the more the rate works for you, which is why starting sooner beats squeezing more from a shorter timeframe.
Scenario 4 · The UK tax effect
An ISA gets you there faster
In an ISA (tax-free): £22,584
Taxed at 40% (net ~2.4%): £21,144
Where you save changes the outcome. Putting £200 a month into an ISA at 4% builds £22,584 over eight years, all tax-free. The same saving in an ordinary account, for a higher-rate taxpayer whose interest exceeds the Personal Savings Allowance, effectively earns around 2.4% after tax — reaching only £21,144, nearly £1,500 short. To hit the same target, you’d need to save more each month outside an ISA. With a £20,000 annual ISA allowance available, sheltering goal savings is one of the simplest ways to reach a target sooner. See ISA vs SIPP vs GIA.
Four levers to hit your goal sooner
Most savings goal calculators just spit out a monthly number. But if that number is too high, you have four ways to bring it down — and in the UK, one of them is about tax, not saving harder. Work through these:
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1
Can you give the goal more time?
Time is the cheapest lever. Reaching £10,000 needs £833 a month over one year, but only £167 over five years — a fraction of the monthly amount for the same target. If the monthly figure feels impossible, stretching the deadline is usually the simplest fix, and it lets interest do more of the work.
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2
Do you have a starting balance to put in?
Any money you start with compounds for the whole timeframe, so it counts for more than its face value. A £5,000 head start on a £30,000 deposit saves about £92 a month — £5,520 over five years, more than the head start itself. Front-load whatever you can.
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3
Is your money in an ISA?
This is the UK lever. Interest outside an ISA is taxable above your Personal Savings Allowance, slowing your progress. Inside an ISA, with a £20,000 annual allowance, it grows tax-free — so you reach the target faster, or need to save less each month to get there.
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4
Have you matched risk to the timeframe?
For short goals (1–3 years), a safe cash savings account or cash ISA protects the money you’ll need soon. For longer goals, investing may offer higher returns — but values can fall, so it suits horizons where you can ride out the bumps. Match the account to when you need the cash.
£30,000 house deposit — what changes the monthly
Monthly amount needed, at 4%:
The same £30,000 deposit can demand £785 a month or £360, depending only on the timeframe and whether you start with something — a £425 difference for an identical goal. That’s why “how much should I save?” has no single answer until you fix the date and the starting point. For most savers the practical order is: set a realistic deadline, put in any lump sum you can up front, keep the money in an ISA so growth is tax-free, and match the account type to when you’ll need the cash. Get those right and the monthly figure often becomes manageable. The calculator lets you flex each one to find a plan that fits your budget.
Solving for time instead of money
Sometimes the monthly amount is fixed by your budget, and the real question is when you’ll get there. The calculator can work that way too: tell it how much you can save each month, and it shows how long the goal takes. Saving £200 a month toward £10,000 reaches the target in about 47 months at 4% — just under four years — versus 50 months with no interest. Flipping the question like this is useful when the deadline is flexible but the monthly amount isn’t: it turns “I can manage £200” into a concrete finish date.
Two scenarios that change the picture
What if…
You gave the goal two more years?
What if…
You’re building an emergency fund?
Key savings goal terms explained
Setting a savings goal brings together a few simple ideas about contributions, interest, and the UK accounts that protect your money. The ten below cover what you’ll meet.
- Savings goal
- A target amount and date — say £30,000 for a deposit in five years. The calculator works backwards to the monthly contribution needed to reach it.
- Monthly contribution
- The regular amount you set aside to reach the goal. The main figure the calculator produces, lower than simply dividing the target by the months because interest helps.
- Starting balance
- Money you already have toward the goal. Because it compounds for the whole timeframe, it reduces the monthly amount by more than its face value spread over the term.
- Timeframe
- How long you give yourself to reach the goal. The single biggest lever on the monthly amount — more time means a much smaller monthly contribution and more help from interest.
- Interest rate
- The annual return on your savings. The higher it is, the more interest contributes toward the goal and the less you need to save yourself, especially over long periods.
- Compounding
- Interest earning interest of its own as it’s added to the balance. It’s why a long-term goal needs less monthly saving than the target divided by the number of months.
- Emergency fund
- A common first goal: three to six months of essential expenses kept in easy-access savings, so an unexpected cost or loss of income doesn’t force you into debt.
- ISA
- A savings or investment account where interest and gains are tax-free, with a £20,000 annual allowance. Holding goal savings in one means you reach the target faster.
- Personal Savings Allowance
- The interest you can earn tax-free outside an ISA: £1,000 for basic-rate taxpayers, £500 for higher-rate. Above it, tax slows your progress toward the goal.
- Easy-access account
- Savings you can withdraw at any time without penalty. Best for short-term goals and emergency funds, where you may need the money sooner than planned.
Five mistakes people make with savings goals
Savings goals are simple in principle but easy to set up badly. These five errors, drawn from the recurring r/UKPersonalFinance and r/UKPersonalFinance budgeting threads, are the ones that derail a plan.
Ignoring interest and over-saving
Simply dividing the target by the number of months ignores the interest your savings earn, so you set the monthly amount too high. Over long periods this overstates the figure noticeably — £20,000 in ten years needs £136 a month at 4%, not £167. Let interest count toward the goal.
Cost: saving more than you need to Fix: factor in the interest rateSetting a deadline that’s too tight
A short timeframe makes the monthly amount punishingly high — £10,000 in a year is £833 a month, against £167 over five years. People set an unrealistic deadline, can’t keep up, and give up. Time is the cheapest lever; a realistic deadline you can sustain beats an ambitious one you abandon.
Cost: an unaffordable plan you quit Fix: choose a deadline you can sustainSaving for goals outside an ISA
Keeping goal savings in an ordinary account once interest tops the Personal Savings Allowance means tax slows your progress. With a £20,000 ISA allowance available, leaving it exposed costs you growth — you reach the target later, or have to save more each month. Use the wrapper.
Cost: a slower path to the target Fix: hold goal savings in an ISALocking away money you’ll need soon
Chasing a slightly higher rate by putting short-term goal money in a fixed-term account can backfire if you need it early and face penalties or can’t access it. For goals within a year or two, and for an emergency fund, easy-access savings matter more than squeezing out the top rate.
Cost: penalties or locked-up cash Fix: match access to when you need itInvesting for a short-term goal
Putting money you’ll need in a year or two into investments risks a fall in value just when you need it. Markets can drop, and short horizons leave no time to recover. Investing suits long-term goals; for anything within a few years, the safety of cash savings usually wins.
Cost: a shortfall at the worst moment Fix: keep short-term goals in cash savingsFrequently asked questions
How much do I need to save each month to reach my goal?
It depends on your target, your timeframe, and the interest rate. The calculator works backwards to the monthly amount that, compounded over the period, reaches your target. For example, £30,000 in five years at 4% needs about £453 a month from a standing start.
The figure is lower than simply dividing the target by the number of months, because the interest your savings earn counts toward the goal. A starting balance reduces it further.
How is the monthly saving amount calculated?
It rearranges the compound interest formula to solve for the contribution. In words: the monthly amount is the target, minus what any starting balance grows to, divided by a factor that accounts for each contribution compounding from when it’s paid in.
The practical effect is that the longer the timeframe and the higher the rate, the more interest contributes — so the monthly figure falls. The calculator does the maths for you; you just enter the target, timeframe, rate, and any starting balance.
Does a starting balance really make that much difference?
Yes, more than you’d expect, because it compounds for the whole timeframe. On a £30,000 deposit goal over five years, starting with £5,000 instead of nothing cuts the monthly amount from about £453 to £360 — a £92 monthly saving, or £5,520 across the term.
That’s more than the £5,000 head start itself, because the lump sum earns interest the entire time it sits there. It’s why getting some money into a goal early is so valuable: every early pound works longer than a later one.
How long will it take to reach my goal?
If your monthly amount is fixed by your budget, the calculator can solve for time instead. Saving £200 a month toward £10,000 reaches the target in about 47 months at 4% — just under four years — compared with 50 months with no interest.
This is useful when the deadline is flexible but the monthly amount isn’t. It turns “I can manage £200 a month” into a concrete finish date, and shows how a higher rate or a starting balance brings that date forward.
Should I save for my goal in an ISA?
Usually, yes. Interest inside an ISA is completely tax-free, so your savings grow faster and you reach the target sooner. Outside an ISA, interest is taxed once it exceeds your Personal Savings Allowance (£1,000 basic-rate, £500 higher-rate), which slows progress.
Over eight years, £200 a month at 4% builds £22,584 in an ISA, but only around £21,144 for a higher-rate taxpayer in a taxed account. With a £20,000 annual ISA allowance, sheltering goal savings is one of the simplest ways to get there faster.
How big should my emergency fund be?
A common guideline is three to six months of essential expenses. If your monthly costs are £2,000, that’s a target of £6,000 to £12,000, kept in easy-access savings so you can reach it quickly when needed.
Building a £6,000 buffer over 18 months needs about £324 a month at 4%. Because this is money you can’t afford to lock away or risk, an easy-access account or cash ISA suits it better than a fixed-term or investment account.
Should I save in cash or invest for my goal?
It depends on the timeframe. For short-term goals (one to three years) and emergency funds, cash savings or a cash ISA protect money you’ll need soon — investments can fall in value at the wrong moment.
For long-term goals, investing may offer higher returns, but values go up and down, so it suits horizons where you can ride out the bumps. Match the account to when you need the cash: the further off the goal, the more you can consider investing.
What if I can’t afford the monthly amount?
You have several levers. The cheapest is more time — stretching a £30,000 goal from three years to five drops the monthly amount from about £785 to £453. You can also add any starting balance you have, find a higher rate, or use an ISA to keep growth tax-free.
If none of those make it affordable, it may be a sign to adjust the target itself. A realistic plan you can stick to beats an ambitious one you abandon after a few months.
Related calculators
A savings goal connects to projecting growth, measuring returns, and the wrappers and tax that shape your progress. These calculators handle each piece.
Methodology & sources
How the maths works
The calculator solves the future value of an annuity for the monthly contribution. The target equals your starting balance grown over the period, plus the future value of your regular contributions, each compounded monthly from when it’s paid in. Rearranged, the monthly amount is the target minus the grown starting balance, divided by the annuity factor ((1 + i)^n − 1) ÷ i, where i is the monthly rate (annual rate ÷ 12) and n is the number of months. It can also solve in reverse: given a fixed monthly amount, it steps month by month to find how long the goal takes. For the UK tax illustration, growth inside an ISA is treated as tax-free, and growth outside one uses a net rate after the relevant Income Tax rate is applied to interest above the Personal Savings Allowance.
These are illustrative projections to help you plan, not a forecast or guarantee. Real outcomes depend on the actual interest or investment rate, which varies between products and changes over time, how often interest compounds, your tax position, inflation, and whether you keep contributing consistently. Savings rates and tax allowances can change, and investment values can fall as well as rise. The figures use illustrative rates to show the principle. The aim is to help you set a realistic, affordable plan to reach a target — not to recommend any particular savings or investment product.
Assumptions and conventions used
- Future value of an annuity, solved for the monthly contribution
- Monthly compounding: i = annual rate ÷ 12
- Starting balance compounds for the full timeframe
- Reverse mode: solves for time given a fixed monthly amount
- ISA growth: tax-free (£20,000 annual allowance)
- Taxed growth: net rate after tax on interest above the PSA
- Personal Savings Allowance: £1,000 basic, £500 higher
- Emergency fund: 3–6 months of essential expenses
- Rates shown are illustrative, not predictions
Primary sources
Frequently asked questions
How much do I need to save each month to reach my goal?
It depends on your target, your timeframe, and the interest rate. The calculator works backwards to the monthly amount that, compounded over the period, reaches your target. For example, £30,000 in five years at 4% needs about £453 a month from a standing start.
The figure is lower than simply dividing the target by the number of months, because the interest your savings earn counts toward the goal. A starting balance reduces it further.
How is the monthly saving amount calculated?
It rearranges the compound interest formula to solve for the contribution. In words: the monthly amount is the target, minus what any starting balance grows to, divided by a factor that accounts for each contribution compounding from when it’s paid in.
The practical effect is that the longer the timeframe and the higher the rate, the more interest contributes — so the monthly figure falls. The calculator does the maths for you; you just enter the target, timeframe, rate, and any starting balance.
Does a starting balance really make that much difference?
Yes, more than you’d expect, because it compounds for the whole timeframe. On a £30,000 deposit goal over five years, starting with £5,000 instead of nothing cuts the monthly amount from about £453 to £360 — a £92 monthly saving, or £5,520 across the term.
That’s more than the £5,000 head start itself, because the lump sum earns interest the entire time it sits there. It’s why getting some money into a goal early is so valuable: every early pound works longer than a later one.
How long will it take to reach my goal?
If your monthly amount is fixed by your budget, the calculator can solve for time instead. Saving £200 a month toward £10,000 reaches the target in about 47 months at 4% — just under four years — compared with 50 months with no interest.
This is useful when the deadline is flexible but the monthly amount isn’t. It turns “I can manage £200 a month” into a concrete finish date, and shows how a higher rate or a starting balance brings that date forward.
Should I save for my goal in an ISA?
Usually, yes. Interest inside an ISA is completely tax-free, so your savings grow faster and you reach the target sooner. Outside an ISA, interest is taxed once it exceeds your Personal Savings Allowance (£1,000 basic-rate, £500 higher-rate), which slows progress.
Over eight years, £200 a month at 4% builds £22,584 in an ISA, but only around £21,144 for a higher-rate taxpayer in a taxed account. With a £20,000 annual ISA allowance, sheltering goal savings is one of the simplest ways to get there faster.
How big should my emergency fund be?
A common guideline is three to six months of essential expenses. If your monthly costs are £2,000, that’s a target of £6,000 to £12,000, kept in easy-access savings so you can reach it quickly when needed.
Building a £6,000 buffer over 18 months needs about £324 a month at 4%. Because this is money you can’t afford to lock away or risk, an easy-access account or cash ISA suits it better than a fixed-term or investment account.
Should I save in cash or invest for my goal?
It depends on the timeframe. For short-term goals (one to three years) and emergency funds, cash savings or a cash ISA protect money you’ll need soon — investments can fall in value at the wrong moment.
For long-term goals, investing may offer higher returns, but values go up and down, so it suits horizons where you can ride out the bumps. Match the account to when you need the cash: the further off the goal, the more you can consider investing.
What if I can’t afford the monthly amount?
You have several levers. The cheapest is more time — stretching a £30,000 goal from three years to five drops the monthly amount from about £785 to £453. You can also add any starting balance you have, find a higher rate, or use an ISA to keep growth tax-free.
If none of those make it affordable, it may be a sign to adjust the target itself. A realistic plan you can stick to beats an ambitious one you abandon after a few months.
Related calculators
A savings goal connects to projecting growth, measuring returns, and the wrappers and tax that shape your progress. These calculators handle each piece.
Methodology & sources
How the maths works
The calculator solves the future value of an annuity for the monthly contribution. The target equals your starting balance grown over the period, plus the future value of your regular contributions, each compounded monthly from when it’s paid in. Rearranged, the monthly amount is the target minus the grown starting balance, divided by the annuity factor ((1 + i)^n − 1) ÷ i, where i is the monthly rate (annual rate ÷ 12) and n is the number of months. It can also solve in reverse: given a fixed monthly amount, it steps month by month to find how long the goal takes. For the UK tax illustration, growth inside an ISA is treated as tax-free, and growth outside one uses a net rate after the relevant Income Tax rate is applied to interest above the Personal Savings Allowance.
These are illustrative projections to help you plan, not a forecast or guarantee. Real outcomes depend on the actual interest or investment rate, which varies between products and changes over time, how often interest compounds, your tax position, inflation, and whether you keep contributing consistently. Savings rates and tax allowances can change, and investment values can fall as well as rise. The figures use illustrative rates to show the principle. The aim is to help you set a realistic, affordable plan to reach a target — not to recommend any particular savings or investment product.
Assumptions and conventions used
- Future value of an annuity, solved for the monthly contribution
- Monthly compounding: i = annual rate ÷ 12
- Starting balance compounds for the full timeframe
- Reverse mode: solves for time given a fixed monthly amount
- ISA growth: tax-free (£20,000 annual allowance)
- Taxed growth: net rate after tax on interest above the PSA
- Personal Savings Allowance: £1,000 basic, £500 higher
- Emergency fund: 3–6 months of essential expenses
- Rates shown are illustrative, not predictions