Savings Goal Calculator: Plan How Much to Save Each Month

Start with the calculator above

Enter your target amount, your starting balance, the date or number of months you have, and an estimated annual interest rate. The savings goal calculator fills in the missing piece: the monthly contribution you need, or, if you fix the monthly amount instead, the time it will take to get there. Change one number and everything else updates, which is the quickest way to find a plan you can actually stick to.

What a savings goal really is

A savings goal is just a target amount tied to a deadline. "I want to save more" rarely works because there is nothing to measure against. "I want £6,000 for a deposit by August next year" works because it forces a monthly number you can either afford or you cannot. The job of this tool is to expose that number early, while you still have room to change the target, the timeline or your spending.

Most UK savers are working towards one of a handful of goals: a house deposit, a wedding, a new car, a holiday, a baby on the way, or an emergency fund worth three to six months of outgoings. The maths is identical for all of them. Only the numbers and the urgency change.

Two ways to plan: fix the amount or fix the time

There are two honest ways to approach a savings goal, and this calculator handles both.

• Fix the deadline, solve for the monthly amount. You know you need £10,000 by a wedding date 18 months away. The tool tells you what to save each month to land on time. This is the right mode when the date is non-negotiable.
• Fix the monthly amount, solve for the time. You know you can comfortably spare £200 a month and not a penny more. The tool tells you how many months until you hit the target. This is the right mode when your budget is the hard limit, not the date.

Plenty of people flip between the two. You start with a deadline, see the monthly figure is unaffordable, then switch modes to find out how long the realistic amount actually takes. That back-and-forth is the point.

How the savings goal calculator works

Strip away the interest for a moment and the core formula is simple arithmetic:

Monthly saving = (Target amount − Money you already have) ÷ Number of months

So if you want £6,000, you already have £600, and you have 18 months, you need (£6,000 − £600) ÷ 18 = £300 a month. Reverse it to solve for time: Months = (Target − Starting balance) ÷ Monthly saving. Saving £300 a month towards a £5,400 gap takes 18 months.

Interest makes it slightly more generous, because the money you save earns more money while it sits there. Each month your balance grows by your new contribution plus a small slice of interest on everything already saved. The calculator applies the monthly equivalent of your annual rate to the running balance, which is why a goal with interest needs slightly smaller monthly payments than the plain division suggests. The longer the timeline and the higher the rate, the bigger that effect becomes. This is compounding doing the heavy lifting, and you can explore it in more detail with our compound interest calculator.

One thing to keep in mind: the interest rate you enter is an estimate of what a savings account or ISA pays, not a fixed official figure. Rates move with the Bank of England base rate and with whatever deals providers are offering, so it is sensible to plug in a cautious number rather than the headline rate on a short-lived bonus account.

Worked example: Priya saving for a house deposit

Priya is a 29-year-old nurse in Leeds who wants a £20,000 deposit. She already has £3,500 saved and wants to buy in three years (36 months). She has found an easy-access account paying 4% a year.

The gap she needs to close is £20,000 − £3,500 = £16,500.

Ignoring interest, the plain monthly figure is £16,500 ÷ 36 = £458.33 a month.

With 4% annual interest compounding monthly, two things help her. Her existing £3,500 grows on its own, and every monthly contribution earns interest for the months that follow. Over three years that means she reaches £20,000 with a monthly contribution a little under the £458 figure, because the interest fills part of the gap for her. The exact saving depends on how the account compounds, but the direction is always the same: interest reduces the monthly amount you personally have to find.

If £458 a month is too steep for Priya's budget, she has three levers, and only three: save more each month, give herself longer, or lower the target. Switching the calculator to "solve for time" shows her that £350 a month would still get her there, just over a longer period. That is a far more useful conversation than guessing.

A second example: building a £3,000 emergency fund

Tom is a self-employed electrician with no safety net, which feels uncomfortable when work is patchy. He wants a £3,000 buffer and starts from zero. He decides £250 a month is doable in busy months.

£3,000 ÷ £250 = 12 months with no interest. Park it in an account paying a little interest and he gets there a few weeks sooner. The emotional payoff matters here too: knowing one slow month will not tip you into a credit card is worth planning for, and a clear finish line makes the saving feel temporary rather than endless.

How interest speeds you up

Interest is the difference between saving alone and saving with a tailwind. Three settings change how much it helps:

• The rate. A higher annual rate means more growth on the same balance. Even one percentage point adds up over years.
• The timeline. Compounding rewards patience. A two-year goal sees modest interest; a ten-year goal can see a meaningful chunk of the target paid for by interest alone.
• Where you keep it. A tax-free wrapper keeps more of the interest in your pocket, which we cover below.

For longer or larger goals it is worth modelling the growth properly with our savings calculator or, if you are paying in a steady amount every month, the regular savings calculator, which is built around monthly-saver products.

Tax on your savings interest, briefly

Interest you earn is potentially taxable, but most savers never pay a penny because of the Personal Savings Allowance. A basic-rate taxpayer can earn up to £1,000 of savings interest a year tax-free; a higher-rate taxpayer gets £500; additional-rate taxpayers get nothing. Below those limits your savings interest is yours to keep.

If your goal is large and the interest pushes you near those limits, an ISA shelters the interest entirely. The annual ISA allowance is £20,000, and anything held inside it grows free of UK tax on interest, with no allowance to worry about. For most goal savers a cash ISA is the simplest tax-free home. You can plan one with our ISA calculator.

Setting a monthly amount you can actually keep up

The most common reason savings goals fail is setting a monthly figure that looks fine on a spreadsheet and falls apart the first time the boiler breaks. A few practical checks before you commit:

• Base it on your real spare cash. Work out your income minus your genuine monthly outgoings first, then set the goal against what is left. Our budget calculator is the right place to find that number honestly.
• Automate it on payday. A standing order that moves the money the day you are paid beats relying on willpower at the end of the month. You save what is left after saving, not the other way round.
• Leave a margin. If the calculator says £458 and that is the absolute maximum you can manage, you have no slack. Aim for a figure that survives a bad month.
• Review at three months. If you have hit the target every month, consider nudging it up. If you have missed twice, lower it before you give up entirely.

Where to keep your goal savings

The right home depends on your timeline. For goals under about five years, cash is usually the sensible choice, because you cannot afford for the pot to fall in value just before you need it. Options to weigh:

• Easy-access savings for short goals or an emergency fund you might need at any moment.
• A cash ISA if interest would otherwise be taxed, or you simply prefer a tax-free wrapper.
• A regular saver for the best headline rates, though these usually cap how much you can pay in each month.
• Fixed-rate bonds if you are certain you will not touch the money before a set date.

For longer goals well beyond five years, investing rather than saving may suit better, but that brings the risk of short-term falls and is a different decision entirely. Whatever you choose, make sure the provider is covered by the FSCS, which protects eligible deposits up to £85,000 per banking licence.

Common mistakes people make with savings goals

• Forgetting the money they already have. If you have £3,500 saved, the goal is the gap, not the full target. Entering a £20,000 target with a £0 starting balance overstates the monthly figure badly.
• Using an optimistic interest rate. Plugging in a 12-month bonus rate that drops after a year inflates the help interest gives you. Use a conservative, sustainable figure.
• Setting a deadline with no give. A wedding date is fixed; "a new car at some point" is not. Tying a flexible goal to a tight deadline only sets you up to feel behind.
• Ignoring inflation on long goals. A £20,000 deposit target set today may need to be higher in five years if house prices rise. For distant goals, build in a buffer.
• Treating the emergency fund and the goal as the same pot. If you raid your deposit savings every time something breaks, you never make progress. Keep a separate buffer so the goal pot stays untouched.
• Counting interest as taxable when it usually is not. Many savers assume HMRC takes a slice of every penny of interest. In practice the Personal Savings Allowance covers most people entirely.

Across the UK the savings mechanics are the same in England, Scotland, Wales and Northern Ireland: there is no regional savings tax and the ISA and Personal Savings Allowance rules apply everywhere. Scotland sets its own income tax bands, which can affect whether you are a basic or higher-rate taxpayer for the purposes of your Personal Savings Allowance, but the savings interest rates and allowances themselves are UK-wide.

For independent, non-commercial guidance on building a savings habit, the government-backed MoneyHelper guide to saving is a solid starting point.

These results are estimates for guidance only and not personal tax or financial advice. Interest rates, allowances and your own circumstances will affect the real outcome.

Related calculators

Once you have your monthly target, line up the rest of your plan. Check the growth with the savings calculator, see how monthly-saver rates compare on the regular savings calculator, and find your true spare cash with the budget calculator before you set the figure in stone.