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Featured calculators
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Percentage calculator
Find a percentage of a number.
MathReverse percentage
Find what percentage one value represents.
MathDiscount and percentage change
Calculate a discounted or increased price.
MathCompound interest
Capital and deposits, year by year.
Savings & expensesSavings plan
Calculate savings from monthly deposits.
Savings & expensesAppliance energy use
How many kWh does a device use?
Home & energyElectricity cost
Estimate electricity expense from kWh.
Home & energyTrip fuel cost
How much fuel will a trip cost?
Cars & travelFuel economy conversion
Convert L/100 km ↔ km/L.
Cars & travelDays between dates
Find the difference between two dates.
TimePercentage change
Measure an increase or decrease.
MathVAT calculator
Add or extract a chosen tax rate.
Savings & expensesSplit a bill
Split the cost, with an optional tip.
Savings & expensesSavings goal
How many months to reach your goal?
Savings & expensesCompare savings plans
Two monthly deposits, two outcomes.
Savings & expensesAppliance running cost
Turn power and usage into cost.
Home & energyAverage speed
Distance and time, in km/h.
Cars & travelAdd or subtract days
Find a future or past date.
TimeNo results found
Try another word or choose a different category.
Make sense of the numbers
How compound interest works
Capital, deposits and returns: understand the simulation step by step.
Read the explanationVAT: add it or extract it?
A practical example to understand net amount, tax and gross amount.
Read the explanationFrom watts to your energy bill
See how power, usage and unit price affect running costs.
Read the explanationResults are estimates or mathematical calculations. Always check the assumptions stated for each tool.