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Mortgages, macros, metres and more — precision tools that load instantly and show their working.

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Finance

22 calculatorsAll Finance →

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Mortgage Repayment CalculatorMonthly cost, total interest and a year-by-year amortisation schedule.

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Health

20 calculatorsAll Health →

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BMI CalculatorAdult body mass index from height and weight, with its standard BMI category and the body-weight interval for BMI 18.5–24.9.

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Math

24 calculatorsAll Math →

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Percentage Change CalculatorThe percentage increase or decrease between two numbers, with the working shown.

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Everyday

7 calculatorsAll Everyday →

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Age CalculatorExact age in years, months and days from a date of birth.

Conversion

6 calculatorsAll Conversion →

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Centimetres to Inches ConverterCentimetres to inches and back, with a table of the values people look up.

Construction

7 calculatorsAll Construction →

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Concrete Volume CalculatorCubic metres of concrete for a slab, footing or column, plus the bags needed.

Physics

6 calculatorsAll Physics →

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Ohm's Law CalculatorVoltage, current, resistance and power — enter any two, get the rest.

Business

13 calculatorsAll Business →

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Profit Margin CalculatorGross, operating and net margin from revenue and cost.

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Engineering

7 calculatorsAll Engineering →

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Travel

1 calculatorAll Travel →

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Trip cost

Trip Cost CalculatorEstimate fuel, tolls, accommodation, food and other trip costs, split between travellers.