Free calculators for money, building, and everyday life
Every calculator is free, works on your phone, and needs no sign-up.
Your favourites
Finance
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What it does
Work out your monthly mortgage payment, total interest and loan-to-value for a repayment or interest-only mortgage.
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What it does
Work out Stamp Duty Land Tax on a home in England or Northern Ireland, including first-time buyer relief and the second home surcharge.
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What it does
See how savings grow with compound interest and monthly payments. Free, with the formula and a worked example.
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What it does
Work out the monthly repayment on a personal loan or car loan, the total interest, and how the balance falls year by year.
Business
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What it does
Add VAT to a price or take it off, at 20%, 5% or any rate. Shows the VAT amount and the prices with and without VAT.
Construction & DIY
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What it does
Work out how much concrete you need for a slab, base or path, with extra for waste and an approximate weight.
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What it does
Find a roof's pitch in degrees, as a rise in 12 and as a percentage, from its rise and run, plus the rafter length.
Engineering
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What it does
Find voltage, current or resistance from the other two using Ohm's law, plus the power in watts.
Health
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What it does
Work out your body mass index (BMI) in cm and kg, feet and inches, or stones and pounds, and see the healthy weight range for your height.
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What it does
Work out how many UK units of alcohol are in a drink from its size and strength, and how that compares with the weekly guideline.
Maths
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What it does
Work out a percentage of a number, what percentage one number is of another, percentage change, and adding or taking off a percentage.
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What it does
Add, subtract, multiply and divide fractions and mixed numbers, with the answer simplified, as a mixed number and as a decimal.
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What it does
Find the mean, median, mode and range of a list of numbers. Paste or type them separated by commas, spaces or new lines.
Time & date
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What it does
Count the days, weeks and weekdays between two dates, with the option to include the end date.
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What it does
Work out the hours in a shift from start and finish times, minus breaks, in hours and minutes and decimal hours, plus weekly hours and pay.
Conversion
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What it does
Convert temperatures between Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Rømer, Newton and Delisle, with the formulas.