Savings Goal Calculator

A savings goal calculator works out how much you need to save each month to reach a target amount by a set date, or how long it will take to reach your goal at your current savings rate. It is used by anyone with a specific financial target: a house deposit, a holiday, an emergency fund, a wedding, or any other time-bound savings objective.

How to Use the Savings Goal Calculator

1. Enter your savings target (the total amount you want to reach).
2. Enter your current savings balance (if you already have some money saved).
3. Enter the annual interest rate on your savings account.
4. Enter either the time available (in months or years) to find the required monthly contribution, or enter your planned monthly contribution to find how long it will take.
5. Click calculate to see the result.

The Formula

To find the required monthly contribution to reach a target:

C = (FV - P x (1 + r)^n) x r / ((1 + r)^n - 1)

Where FV is the savings target, P is the current balance, r is the monthly interest rate (annual rate / 12), n is the number of months, and C is the required monthly contribution.

To find the time needed at a given contribution:

n = ln((FV x r + C) / (P x r + C)) / ln(1 + r)

Real-World Example

You want to save £15,000 for a house deposit in 3 years (36 months). You already have £3,000 saved and your account earns 4.2% AER (monthly rate 0.35%).

• Remaining target: £15,000 - (£3,000 x (1.0035)^36) = £15,000 - £3,405 = £11,595
• Required monthly contribution: £11,595 x 0.0035 / ((1.0035)^36 - 1) = approximately £296 per month

If you can only save £200 per month instead:

• Time to reach £15,000: approximately 48 months (4 years)

Making Your Savings Goal Stick

Setting a savings goal is straightforward; reaching it requires a system. Automate the transfer on payday so the money moves before you can spend it; people who wait until the end of the month to save typically save far less. Keep goal-specific savings in a separate, named account so the purpose is visible and the money is not accidentally spent. Review your progress quarterly rather than daily. If you fall short one month, increase the next month's contribution rather than abandoning the plan. For goals more than 5 years away, consider whether a cash savings account is the most efficient vehicle; at longer time horizons, investing in a Stocks and Shares ISA often outpaces inflation more effectively than cash, though it carries more short-term volatility.

Frequently Asked Questions

Should I keep my savings goal money in a separate account? Yes. A dedicated account prevents the funds from being absorbed into everyday spending. Named savings accounts (sometimes called "pots" or "spaces" in modern bank apps) make the goal tangible. If the account is also hard to access (notice accounts requiring 30 to 95 days) or locked for a fixed term, this adds a practical barrier to spending the money early.

Does it matter what order I contribute to savings goals? Yes. Prioritise an emergency fund of 3 to 6 months' expenses first, as this prevents you from raiding other savings when unexpected costs arise. After that, high-return goals (pension contributions, especially with employer matching) should generally come before lower-return cash savings goals. For goals within 5 years, cash or fixed-rate savings are typically appropriate. For goals more than 5 to 7 years away, investments in diversified funds tend to outperform cash after inflation.

What if interest rates change during my savings period? Recalculate periodically, especially if your savings account rate changes. If rates fall, you will need to save slightly more each month or accept a longer timeline. If rates rise, you may reach your goal faster or reduce monthly contributions. For goals dependent on a specific date (a house purchase, school fees), err on the side of a higher monthly contribution than the calculator strictly requires, to build a small buffer.

How much should I have in an emergency fund? Most financial advisers recommend 3 to 6 months of essential expenses (rent or mortgage, utilities, food, transport, minimum debt payments) held in an accessible account. Freelancers and the self-employed are often advised to hold 6 to 12 months, as income can be less predictable. Use this calculator to set a target and a timeline for reaching full emergency fund coverage.

Working back from a target to a deposit

The formula above solves for the contribution, and a single worked case shows how much the starting balance does for you. Set the target at 30,000 in 60 months, the starting balance at 5,000, and the rate at 3.8% AER, which is a monthly rate of 0.0031667.

So 60 deposits of 363.16 reach the target, and the saver's own money is 5,000 plus 21,789.61 of deposits, which is 26,789.61 of the 30,000. Interest supplies the remaining 3,210.39.

The same target with nothing saved at the start needs 454.79 a month, because the 5,000 would have grown to 6,044.43 on its own. Starting with 5,000 rather than nothing is worth 91.63 a month over six years, which puts a number on the advice to start early.

What one missed deposit costs

Missing a deposit is not a one-for-one loss, because the missed money would have earned interest for the rest of the plan. Suppose the 363.16 deposit due in month 7 does not go in, and 54 months remain.

The missed deposit would have grown to 430.77 by the end of the plan, at 363.16 x (1.0031667) to the power 54. Recovering that shortfall over the remaining 54 months costs an extra 7.33 a month. The total paid rises from 21,789.61 to 21,822.11 across the plan.

That is a small penalty for a single slip, and it stays small because the shortfall is spread over a long remaining term. The same slip in month 54 with six months to run would need most of the missed amount back in one or two payments. The lesson is not that a missed month ruins the plan. It is that the plan recovers cheaply while time remains and expensively when it does not.

The timeline against the deposit you can afford

Reverse the question and the same inputs give a timeline. Take the example above, with a 15,000 target and 3,000 already saved at 4.2% AER.

Read the table for its shape rather than its exact entries. Each step up in the deposit buys a smaller cut in the timeline than the step before it, because the starting balance and the interest do more of the work as the timeline shortens. Going from 150 to 200 a month saves 14 months. Going from 400 to 500 saves five.

The formula and the page's own example disagree at one point, and the difference is worth stating. The page prints a required contribution of approximately 296 a month for this case, and a time of approximately 48 months at 200 a month. Feeding the page's own inputs through the page's own formulas gives 302.86 a month, and 53 months at 200 a month. The figures in the table above come from the formulas, so a reader who reproduces the arithmetic will land on 302.86 and 53.

What a savings goal plan assumes

Every projection on this page holds the same things fixed, and each one is a way for the plan to drift.

The rate stays constant for the life of the plan. Deposits go in at the end of each month, so a deposit made on payday rather than at month end earns slightly more than the table shows. The target does not move with inflation, which matters over long horizons: 15,000 in six years buys less than 15,000 today, so a deposit target set in today's money may need to rise with prices. No tax is modelled, and no fees.

The deposits themselves are the assumption most likely to fail. A plan built on 400 a month assumes the income behind it continues, and the person best placed to judge that is the saver. A useful habit is to set the deposit from the lowest reliable month rather than the average month, and to treat any surplus as an early finish rather than as part of the plan.

A goal with a fixed date carries one more assumption. Where the date cannot move, such as school fees or a completion date, aiming slightly above the calculated deposit builds a buffer against a rate cut or a missed month. Where the date can move, the buffer is less valuable than the flexibility.

What a higher rate is worth over the life of a goal

The rate is the input a saver can shop for, and the same target turns into a different deposit at each rate. Take the 30,000 target over 60 months with 5,000 already saved.

Moving from 3.80% to 4.75% cuts the monthly deposit by 12.99, which is 779.23 across the plan, and it lifts the interest earned by 779.24. A saver who keeps the 363.16 deposit and finds the better rate finishes with 30,877.60, which is 877.60 above the target.

The whole spread from 3.80% to 5.00% is worth about 16 a month on this goal. That is the scale to hold in mind when comparing a fixed-rate bond against an easy-access account. Half a percentage point moves the deposit by a few pounds a month, not by tens of pounds.

Also try these free tools:

• Savings Calculator
• Compound Interest Calculator
• Emergency Fund Calculator