All calculators

Every calculator shows the formula, a worked example and the assumptions behind the result.

Saving & investing

Work out how your money grows over time. These calculators cover compound interest, reaching a savings goal, the return on an investment and inflation.

Compound interest calculatorGrowth with deposits, withdrawals, compounding options and inflation.

Savings goal calculatorHow much to save each month, or how long it takes, to reach a target.

Investment return calculatorTotal return and annualized return (CAGR), with or without monthly deposits.

Inflation calculatorWhat prices become and what your money is worth later at a yearly inflation rate.

Present value and future value calculatorWhat an amount grows to, or what a future amount is worth today.

Savings withdrawal calculatorHow long your savings last with monthly withdrawals, or what amount lasts a set time.

Financial independence calculatorThe savings you need to live off your money, and how long it takes to get there.

Emergency fund calculatorHow big your emergency fund should be, and how long it takes to save.

Investment costs calculatorHow much yearly fees take from your investment, and what lower costs save.

Loans & mortgages

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See what borrowing costs. These calculators show the monthly payment, the total interest and a full schedule for a loan or a mortgage.

Loan calculatorMonthly payment, total interest and a full amortization schedule, with extra payments.

Mortgage calculatorPayment for a home loan with a down payment, and three repayment types.

Rent vs buy calculatorCompare buying a home with renting and investing, with the break-even time.

Work & business

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Everyday money maths for work and small business: add or remove VAT and convert between hourly and monthly pay.

VAT calculatorAdd VAT to a price or take it out, with the VAT amount shown separately.

Hourly wage calculatorTurn an hourly wage into a monthly and yearly salary, or the other way around.

Dutch salary calculator (gross to net)Net salary in the Netherlands for 2026, with tax, premiums and tax credits shown.

Profit margin and markup calculatorMargin and markup from cost and price, or the price for a target margin.

Car & transport

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See what driving really costs, with every cost added up in one place.

Car cost calculatorWhat a car costs per month, with value loss, fuel, insurance and maintenance.

Health

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Simple health calculators with clear formulas.

BMI calculatorBody mass index for adults, with the weight range for your height.

Calorie calculatorDaily calories to keep, lose or gain weight, from your age, size and activity.

Macro calculatorDaily protein, fat and carbohydrate in grams, from your calorie goal.

Weight loss calculatorHow long it may take to reach a goal weight, with a weight loss that slows down.

Body fat calculatorEstimate your body fat percentage from tape measurements (US Navy method).

Heart rate zones calculatorEstimate your maximum heart rate and see five training zones in beats per minute.

Calories burned calculatorCalories burned by walking, running, cycling and 17 other activities, for your weight and time.

Due date calculatorEstimated due date, weeks pregnant and key dates, from your last period or conception.

Everyday

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Handy everyday calculators with clear explanations.

Grade calculatorWeighted average of your grades, and the grade you need on the next test.

Dice rollerRoll up to 20 dice with 4 to 100 sides and see the total.

Time calculatorAdd or subtract hours and minutes, or find the time after a duration.

Percentage calculatorPercent of a number, one number as a percent of another, change and increase or decrease.

Age and date calculatorExact age in years, months and days, or the number of days between two dates.

Working days calculatorWorking days between two dates, or the date after a number of working days.