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167 free calculators for money, health, fitness and everyday maths. Built on current UK rules, instant as you type, nothing to sign up for.

Popular: Take-Home Pay Mortgage Payment BMI Stamp Duty (SDLT) Stone to KG Converter VAT
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167 calculators across 8 categories.

60

Finance

Pay, tax, mortgages, savings, loans and business maths on 2026/27 UK rules.

All 60 finance
27

Fitness

Strength, nutrition, running, cycling and training-volume tools.

All 27 fitness
26

Health

BMI, body fat, energy, vitals, sleep, pregnancy and wellbeing.

All 26 health
8

Maths

Percentages, statistics, algebra, number theory and geometry.

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14

Converters

Length, weight, temperature, speed, cooking and data units.

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5

Date & Time

Days between dates, working days, week numbers and durations.

All 5 date & time
22

Markets

Live crypto, metals and exchange rates, plus trading and investing maths.

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5

Home & Auto

Fuel and EV charging costs, plus paint, tile and concrete quantities.

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The calculators people open most.

Take-Home PayUK income tax + National Insurance on your salary, broken down by band.Finance Mortgage PaymentMonthly repayment from a known loan amount, rate and term.Finance BMIBody mass index from height and weight.Health Stamp Duty (SDLT)What you'd owe on a purchase in England or Northern Ireland.Finance Percentage CalculatorFind a percentage, apply an increase, or reverse one.Finance Income Tax CalculatorBand-by-band income tax, England and Scotland.Finance Compound Interest / ISAGrow a lump sum plus monthly contributions inside your ISA allowance.Finance Loan & EMIMonthly repayment and total interest on any loan amount and term.Finance TDEETotal daily energy expenditure, Mifflin-St Jeor.Health Age CalculatorExact age in years, months, weeks and days.Health Stone to KG ConverterStones and pounds to kilograms and back.Converters GBP to USDLive GBP to USD converter with quick amounts.Markets

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Current UK rules

Tax, National Insurance, stamp duty and benefit calculators use the 2026/27 rates and thresholds, so the figures match what you will actually pay.

Remembers your numbers

Enter your salary or bodyweight once and related calculators fill themselves in. It is saved in your browser, not on a server.

Private by design

Every calculation runs in your browser. What you type is never uploaded, and there is no account to create.

Live where it matters

Crypto, gold and currency calculators fetch current prices as you use them, with a manual fallback if a feed is down.