Calculators built on real data.
Free, accurate tools for finance, maths and unit conversions. No sign-up — just the numbers.
Investments, retirement, mortgages, savings, debt and income tax — built on real market data and current UK tax rules.
Investment Returns Simulator
See what your lump sum and monthly contributions could have grown to across every historical period since 1957.
INVESTMENTS · S&P 500 DATAUK Salary Calculator
Exact take-home pay after income tax, NI, pension and student loan. Updated for 2026/27 with Scottish rates.
INCOME & TAX · 2026/27Investments & Retirement
Mortgage & Property
Savings, Budgeting & Cash
Debt
Income & Tax
Percentages, VAT, averages and everyday maths — with step-by-step workings shown.
Instant metric and imperial conversions. Type in any field and all others update live.
Unit Converter Dashboard
Convert 300+ units across 30 categories — length, mass, pressure, viscosity, flow rate and more. One dashboard, no page-hopping.
TOOLS & UTILITIESTemperature Converter
Celsius, Fahrenheit and Kelvin with reference points for freezing, boiling and body temperature.
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UK Fuel Prices — live from GOV.UK
Every UK forecourt, every price. Unleaded, super unleaded, diesel and premium diesel — updated every 30 minutes. Plus a dedicated Lake District regional guide.