Savings Goal Calculator
Enter your savings goal, current balance, interest rate, and deadline. Get the exact deposit amount you need — and see how compound interest reduces what you have to save yourself.
How is your savings goal calculated?
Working out how much you need to save each month to reach your goal is a classic future-value problem in personal finance. The calculation uses the PMT formula — the same formula used by banks, financial planners, and spreadsheet tools like Excel's PMT() function. The key insight is that each deposit earns interest, and those deposits combine with your existing savings to compound over time.
This savings goal calculator with compound interest works in two steps. First, it calculates how much your existing savings will grow to by your deadline. Then it calculates the deposit required to fund the remaining gap — accounting for the compounding that will occur on each deposit too.
FV = goal − (current savings × (1 + r)ⁿ) — your adjusted shortfall
r = annual rate ÷ deposits per year — the periodic interest rate
n = deposits per year × years — the total number of deposits
Step-by-step walkthrough
Step 1 — Grow your existing savings. If you already have money saved, it earns interest between now and your deadline. Multiply your current balance by (1 + r)ⁿ to find what it will be worth at the end.
Step 2 — Find the shortfall. Subtract that grown value from your goal. This is the gap your new deposits need to cover.
Step 3 — Apply the PMT formula. Plug the shortfall into the formula above. The result is the deposit you need to make every period — daily, weekly, monthly, or at whatever frequency you chose.
To understand how compound interest affects your savings timeline, consider this: the longer you save and the higher the rate, the more each deposit earns on top of itself. At 4.5% over five years, around 15–20% of your final balance typically comes from interest alone.
Alex's example — saving for a career break fund
Alex, a product manager, wants to save the equivalent of £10,000 / $10,000 for a six-month career break in three years. They already have £1,500 / $1,500 set aside, and their savings account pays 4.5% AER / APY, compounded monthly (n = 36).
Step 1: £1,500 grows to approximately £1,714 at 4.5% over 36 months.
Step 2: Shortfall = £10,000 − £1,714 = £8,286.
Step 3: PMT = £8,286 × 0.00375 ÷ ((1.00375)³⁶ − 1) ≈ £220 per month. Total from Alex's own pocket: £7,920. Interest covers the remaining £366.
If Alex wonders what happens when increasing monthly savings by 10 percent — from £220 to £242 — the calculator shows the goal is reached roughly 7 weeks early, or alternatively a slightly larger final balance is achieved within the same timeframe.
For goals more than five years away, a savings goal calculator adjusting for inflation is more accurate. Subtract expected inflation from your nominal rate (e.g., 4.5% rate minus 2.5% inflation = 2% real rate) and enter the real rate instead. This ensures your deposits preserve purchasing power, not just hit a nominal number. See the Compound Interest Calculator for a deeper dive into how compounding frequency and inflation interact.
What does my savings goal result mean?
The monthly deposit figure is the minimum you need to contribute, assuming a fixed interest rate and regular deposits throughout. If your number feels large, you have three levers: increase the interest rate (by switching to a better account), extend the timeline, or reduce the goal. If it feels comfortable, consider contributing a little more — compounding rewards early over-saving disproportionately.
How to act on your result — UK savers
For UK savers, the most tax-efficient home for your deposits depends on your goal timeline. A Cash ISA savings goal calculator shows that sheltering interest inside an ISA avoids tax on every penny earned — important at rates of 4–5% on larger balances. The annual ISA allowance is £20,000 for the 2026/27 tax year (correct as of 2026-05-01), which accommodates up to £1,666 of monthly deposits. From April 2027, the Cash ISA sub-limit drops to £12,000 for under-65s, though the total £20,000 ISA wrapper remains. For goals within 1–3 years, a Cash ISA or high-interest easy-access account (currently 4–5% AER) is usually the right call. For goals of 5+ years — particularly a pension or long-term pot — a Stocks and Shares ISA has historically delivered significantly better real returns, though with more volatility.
The FSCS protects up to £85,000 per person per institution (correct as of 2026-05-01). If your goal implies a balance approaching this limit, consider splitting across two providers.
How to act on your result — US savers
For US savers, a high yield savings account goal calculator makes most sense for short-to-medium-term goals. Online HYSAs currently pay 4–5% APY and are FDIC-insured up to $250,000 per institution (correct as of 2026-05-01). If your goal is retirement-related, check whether contributions to a 401(k) or IRA can substitute — the 2026 401(k) contribution limit is $24,500 (correct as of 2026-05-01), with a $7,500 IRA limit for under-50s. If your employer offers a 401(k) match, capture that first — it's an instant guaranteed return before your savings account rate even matters.
What are the most common savings goal mistakes?
Setting a goal without a deadline. "I want to save £20,000 eventually" is a wish, not a plan. A savings goal needs both a target and a timeframe — the deadline is what the maths depends on.
Using an overly optimistic interest rate. Entering 8% because you've seen long-run equity market figures quoted is fine for a Stocks and Shares ISA over 20 years, but misleading for a 2-year cash goal. Match the rate to the actual account you're using.
Ignoring tax on interest. Outside an ISA (UK) or tax-advantaged account (US), interest is taxable income. UK basic-rate taxpayers have a £1,000 Personal Savings Allowance; higher-rate taxpayers only £500. At 4.5%, you'd exceed the higher-rate PSA with a balance of around £11,000. For a goal implying a large balance, an ISA or HYSA in a tax-advantaged wrapper is worth the setup effort.
Savings Goal Calculator — FAQs
To calculate your monthly savings goal, you divide your target shortfall by the number of months you have — then adjust upward for the interest your deposits will earn. The exact formula is PMT = FV × r ÷ ((1 + r)ⁿ − 1). This calculator handles all the maths: enter your goal, current savings, annual interest rate, and timeframe to get the precise deposit amount per period.
At 4.5% AER/APY over 3 years with no existing savings, you need approximately £500/month to reach £20,000, or $500/month for $20,000. Over 5 years at the same rate, that drops to around £294/month. The exact figure changes with your interest rate and starting balance — use the calculator above for your specific situation.
The 50/30/20 rule allocates 50% of take-home pay to needs, 30% to wants, and 20% to savings and debt repayment. For goal-based saving, your 20% savings portion should be split across an emergency fund, specific goals, and long-term investments. Use this calculator to check whether your 20% actually covers your monthly savings target — if not, you may need to extend the timeline or look for ways to increase contributions.
Most financial planners recommend at least 20% of take-home pay for savings and debt repayment. If you have a specific target — a house deposit, emergency fund, or career break — work backwards from your goal using this calculator to find the exact minimum monthly amount. Anything above that minimum accelerates your timeline; anything below extends it.
Yes — and the effect grows over time. At 4.5% over 5 years, roughly 15–20% of your final balance typically comes from compound interest alone. This means you need to contribute meaningfully less from your own income than if saving at 0%. This calculator accounts for compound interest automatically, so the monthly figure it gives you already reflects the work your interest rate does.
Most UK first-time buyers target between 5% and 20% of the property price. On an average UK home of around £290,000 in 2026, that's £14,500 to £58,000. Many buyers target 10% to qualify for better mortgage rates. A Lifetime ISA (for eligible 18–39 year olds) adds a 25% government bonus on up to £4,000 per year — worth factoring in if you qualify.
Self-employed workers in the UK should typically reserve 25–30% of gross income for Income Tax and Class 4 NICs, kept in a dedicated tax pot. In the US, 1099 contractors should set aside around 25–30% for self-employment tax and federal income tax. Beyond those reserves, target the same savings goals as employees — ideally 20% of net income. Treat goal-based savings and tax reserves as entirely separate pots, each with its own target and timeline, and use this calculator for each one independently.
Missing one deposit doesn't derail your goal — it just means you'll need to contribute slightly more going forward to stay on track. The simplest fix is to update your current savings balance in this calculator and recalculate. The most reliable way to avoid missed deposits is a standing order or automatic transfer timed to leave your account on payday, before the money can be spent on anything else.