Calculators built on real data.
Free, accurate tools for Finance, Construction, Business, Health & Food, Cars & Transport and more. No ads, no sign-up — just the numbers.
Investments, mortgage, savings, debt, income tax and budgeting.
Professional estimating, materials, drainage and lighting calculations.
Board & batten spacing, home improvement ROI, tiling, wallpaper, fencing and home project tools.
VAT, percentages, averages, mean, median, mode and everyday maths tools.
Day rate, break-even analysis, VAT returns and tools for freelancers and small businesses.
TDEE & calorie targets, meat cooking times, alcohol units and NHS-backed health tools.
PCP vs HP car finance, electric vs petrol running costs, and HMRC mileage allowance.
Daily habit costs, coffee vs investing, and what a lottery win is really worth.
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.
SavingsCalculate 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.
BudgetingWork out whether your loft conversion, extension, or kitchen remodel is financially worth it — with UK 2025/26 cost benchmarks, value uplift data, and a plain-English verdict.
DIY ▐▌Calculate perfect board and batten spacing so every gap is identical. Enter wall length, board width and target spacing — get the exact tape-measure cut list.
DIYConvert 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