Simple Financial Calculators for the UK
Free tools to help you understand savings, ISAs and investments — with transparent maths and up-to-date UK rules.
Your ISA plan
Presets are illustrative. Adjust the rate to match your own assumption.
Show yearly breakdown
| Year | Contributions | LISA bonus | Growth | Balance |
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Popular calculators
Every tool is instant, transparent about its maths, and shares with one link.
ISA Calculator
Model a Cash, Stocks & Shares or Lifetime ISA — including the 25% LISA bonus and your £20,000 annual allowance.
Open calculator →UK Savings Calculator
See how regular saving grows over time, in nominal pounds and adjusted for inflation.
Open calculator →Compound Interest Calculator
See how compounding frequency — daily to annually — and regular contributions grow your money.
Open calculator →Investment Return Calculator
Model investment growth, or work out the monthly amount you need to reach a target.
Open calculator →UK Income Tax Calculator
See your 2026/27 Income Tax by band, your Personal Allowance and effective rate.
Open calculator →UK Salary Calculator
Work out take-home pay after Income Tax and National Insurance — monthly and weekly.
Open calculator →National Insurance Calculator
See your Class 1 employee National Insurance by band — 8% and 2% — for 2026/27.
Open calculator →UK Mortgage Calculator
Work out monthly repayments, total interest and LTV — repayment or interest-only.
Open calculator →Mortgage Overpayment Calculator
See how much interest you save and how much sooner you clear your mortgage with a monthly overpayment.
Open calculator →UK Stamp Duty Calculator
Estimate Stamp Duty in England & NI, Scotland and Wales for 2026/27 — with first-time buyer relief.
Open calculator →UK Pension Calculator
See how your pot, contributions, tax relief and growth add up by retirement — and your 25% tax-free lump sum.
Open calculator →UK Retirement Calculator
Find the income gap, the pot you need and the monthly saving to get there — State Pension included.
Open calculator →UK Capital Gains Tax Calculator
Estimate CGT for 2026/27 — chargeable gain, the £3,000 allowance, and 18%/24% rates.
Open calculator →UK Dividend Tax Calculator
See what you owe on dividend income after the £500 allowance at 2026/27 rates.
Open calculator →UK Inflation Calculator
See what money is worth over time with CPI inflation — and the buying power you lose.
Open calculator →Transparent maths
Every calculator shows its formula and assumptions. No black boxes.
No sign-up
Open the page and calculate. No accounts, no email walls.
No data stored
Everything runs in your browser. Your numbers never leave your device.
UK rules
Thresholds reference official GOV.UK sources and state the tax year they apply to.
Built for UK rules. Checked against official sources. Calculated in your browser — How we calculate →