biyo.
Your useful little corner of the internet

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BiyoTool has 58 quick, private browser tools for the moments when a clear answer matters more than a complicated app.

Fast, local, no sign-in58 browser tools, ready when you areBrowse all tools
biyo / quick answer
15% of 240 is
36.
PercentageSaved locally
no accountno trackingready when you are
small tools, big relief

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The everyday essentials

Percentage Calculator

Work out percentages, changes, and proportions in a blink.

Age Calculator

Find an exact age between two dates, down to the day.

Discount Calculator

See the sale price and exactly what you save.

Find your lane

A tool for the shape of your problem.

NumbersHealthFinanceDate & TimeConvertersTextGeneratorsUtilities

Private where it counts.

Calculations happen in your browser. Your inputs stay yours. BiyoTool does not need an account to be useful.

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