Convert anything, then calculate the rest.
Feet to meters, dollars to euros, a 30-year mortgage, a subnet mask or a dice roll. Everything runs right in your browser, and nothing you type is sent anywhere.
Unit & currency converter
From one box to the other
Type in either box. Pick a category, choose your units, and the other side updates as you type.
Calculator hub
22 calculators, one workbench
Open a category and pick a calculator. Results update as you change any number.
Quick reference
American standard to metric
Exact factors where they are defined by law (1 inch = 2.54 cm exactly since 1959).
The fine print
Legal & policies
Effective October 25, 2026.
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