Savings Goal Calculator

Most savings tools ask "what will my money be worth?" This one works in reverse: you tell it the target, the deadline, and the return you expect, and it tells you the monthly deposit required to get there. It's the difference between a vague ambition ("I want to save for a house deposit") and a concrete, dated plan ("I need to put away £468 a month for four years").

It factors in the growth your existing savings and your ongoing contributions will earn, so the figure it returns is the gap that's actually left after compounding has done some of the work for you.

• Prospective homebuyers working out the monthly savings rate needed to build a 10% or 20% deposit by a target date.
• Emergency-fund builders mapping a realistic timeline to 3–6 months of essential spending.
• Parents saving towards university costs or a nest egg for a child.
• Anyone with a specific target — a wedding, a car, a trip — who wants to turn a wish into a dated monthly commitment.

• A specific target figure in today's money. If the goal is years away, consider whether inflation means you should aim higher (see common mistakes below).
• Your current savings earmarked for this goal — what's already in the pot.
• A realistic timeframe in years.
• An honest expected return. Match it to the asset: 3–5% for cash savings or a Cash ISA, 6–8% for a diversified Stocks & Shares ISA over 5+ years. Don't plug in 10% for a risk-free account.

• Target Amount (£) — the lump sum you want to have saved by your deadline, in today's money.
• Current Savings (£) — what you've already put aside for this goal. The calculator projects its growth and subtracts it from the target.
• Years to Goal — how long you have. More time means compounding does more of the heavy lifting, so your required monthly amount drops.
• Expected Annual Return (%) — the yearly growth you assume on the whole pot. The higher (and riskier) the return, the less of your own cash you need to contribute.

The big number is the fixed monthly deposit you'd need to make every month, on time, to hit your target. If it shows £0, your current savings are projected to grow to the target on their own — no further contributions needed. If the figure feels unaffordable, you have three levers: extend the timeframe, lower the target, or seek a higher (but riskier) return. Extending the timeframe is usually the most powerful because compounding is exponential — a small increase in years can cut the monthly requirement dramatically.

Treat the result as a floor, not a ceiling. Real returns fluctuate, so saving slightly more than the calculator suggests gives you a buffer against disappointing years.

A first-time buyer aiming for a house deposit:

• Target Goal: £30,000
• Current Savings: £5,000
• Timeframe: 4 years
• Interest Rate: 4.5% (a typical regular-saver or Cash ISA rate)

Without interest, they'd need £520 a month. But because the pot grows at 4.5%, the calculator shows they only need to save £468.42 a month. Over four years, compound interest contributes more than £2,500 toward the deposit — a meaningful reduction in the monthly burden.

Assumptions

• A constant interest rate for the whole period. Real savings rates move with the Bank of England base rate.
• The exact calculated deposit made at the end of every month, without fail.
• No withdrawals from the pot during the accumulation phase.
• Monthly compounding of interest.

What is not included

• The tax benefits of UK wrappers like ISAs and Lifetime ISAs (LISAs). A LISA adds a 25% government bonus on contributions up to £4,000/year, which can dramatically reduce the monthly amount you need to find yourself.
• Inflation. A £50,000 goal in ten years buys less than £50,000 today — consider raising the target for long horizons.
• Tax on interest earned outside an ISA (the Personal Savings Allowance is £1,000 for basic-rate, £500 for higher-rate taxpayers).
• Market volatility for investment-based goals (sequence-of-returns risk).

• Ignoring inflation. A distant goal in nominal pounds will under-deliver in real purchasing power. For horizons over five years, consider raising the target or using a Stocks & Shares ISA.
• Overstating the return. Assuming 10% on a cash account produces a plan that fails. Match the rate to the asset's real risk and return.
• Forgetting the LISA bonus. First-time buyers under 50 can get £1,000 of government money for every £4,000 saved — not using it is leaving free money on the table.
• Setting an unaffordable monthly figure. If the result is more than your budget allows, adjust the goal or timeframe rather than abandoning the plan entirely.

• Check the result against your Budget Planner surplus. If it fits, set up a standing order so the money leaves your account on payday — you won't miss what you never see.
• Choose the right home for the money: a Cash ISA or regular saver for goals under 5 years, a Stocks & Shares ISA for 5+ years where you can tolerate short-term dips.
• If you're a first-time buyer, open a Lifetime ISA to claim the 25% government bonus — see GOV.UK – Lifetime ISA.
• Re-run the calculation whenever your circumstances change — a pay rise, a moved deadline, or a new target all shift the monthly requirement.

• Compound Interest Calculator: See how your money grows if you simply leave it alone.
• Budget Planner: Find the monthly surplus to meet your new savings target.
• Savings Goals Guide: Strategies for accelerating your savings rate.
• Tax-Free Savings (ISAs) Guide: Shielding your goal's growth from tax.

SmartMoneyTools checks statutory rates and thresholds against official government publications. Results are estimates for educational purposes and may not reflect every individual circumstance. Last reviewed: 11 September 2026.

• GOV.UK – Individual Savings Accounts (ISAs)
• GOV.UK – Lifetime ISA
• MoneyHelper – Types of savings accounts
• FCA – Savings accounts guidance