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Age Calculator
Calculate an exact age between two dates in seconds.
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Percentage Calculator
Four everyday percentage calculations in one place, with instant results as you type.
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Frequently asked questions
What is the difference between percentage change and percentage difference?
Percentage change compares a new value against a specific original value. Percentage difference compares two values against their average, so the order does not matter.
Can I use decimals and negative numbers?
Yes. Both fields accept decimals and negative values, and results are rounded sensibly for readability.
Why does a field say the value cannot be zero?
Dividing by zero has no meaningful result, so the calculator asks for a non-zero total or original value in those modes.
Is anything sent to a server?
No. Every calculation runs in your browser and your numbers never leave your device.