Calculators built on real data.
Free, accurate tools for Finance, Maths and Unit Conversions. No ads, no sign-up — just the numbers.
Investments, mortgage, savings, debt, income tax and budgeting.
VAT, percentages, averages, mean, median, mode and everyday maths tools.
Length, weight, temperature, volume and speed — instant metric and imperial conversions.
See what your lump sum and monthly contributions could have grown to across every historical period. Compare real outcomes against the "8% average" promise.
Investments ↘Stress-test your pension pot against every real S&P 500 window since 1957. See survival rates, ruin risk, and sequence-of-returns in action.
Investments ◎Calculate your financial independence number and how long it will take to reach it. Includes Coast FIRE milestone and year-by-year portfolio growth chart.
Investments ⇄Compare the long-term wealth impact of overpaying your mortgage versus investing. Accounts for tax band, ISA allowance, and your mortgage rate break-even point.
Mortgage ⛽Every UK forecourt, every price — sourced from the legally mandated GOV.UK Fuel Finder API under the Motor Fuel Price (Open Data) Regulations 2025. Unleaded, super unleaded, diesel and premium diesel, with 50L tank cost comparison.
Statutory · 30 min ◈See exactly how savings grow with regular deposits or withdrawals, annual rate increases, inflation adjustment, tax, and a full year-by-year breakdown.
Savings ⇄Convert 300+ units across 30 categories — length, mass, temperature, pressure, viscosity, flow rate, fuel efficiency and more. One dashboard, no page-hopping.
Tools & UtilitiesCalculate your exact take-home pay after income tax, NI, pension and student loan. Updated for 2025/26.
Income & Tax £Calculate monthly repayments, total interest, and the full amortisation schedule for any UK mortgage.
Mortgage ⇌Live Sankey flow chart of where your money goes. Track your savings rate and test what-if scenarios instantly.
BudgetingConvert between millimetres, centimetres, metres, kilometres, inches, feet, yards and miles. Type any value to update all fields simultaneously.
Unit Converter ⚖️Convert between milligrams, grams, kilograms, metric tonnes, ounces, pounds and stone. Includes a combined stone + pounds display.
Unit Converter 🌡️Instantly convert between Celsius, Fahrenheit and Kelvin. Includes reference points for freezing, boiling and body temperature.
Unit Converter