Unit Converter
Convert between 14+ measurement categories instantly. Length, weight, temperature, volume, speed, data storage, and more.
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Categories
Length
Meters, kilometers, miles, feet, inches, yards, nautical miles, and more.
Weight & Mass
Kilograms, grams, pounds, ounces, stones, metric tons.
Temperature
Celsius, Fahrenheit, and Kelvin.
Volume
Liters, gallons, cups, tablespoons, milliliters, fluid ounces.
Speed
m/s, km/h, mph, knots.
Energy
Joules, calories, kilocalories, kilowatt-hours.
Power
Watts, kilowatts, horsepower.
Pressure
Pascals, bars, PSI, atmospheres.
Area
Square meters, acres, hectares, square feet, square miles.
Time
Seconds, minutes, hours, milliseconds, nanoseconds.
Data Storage
Bytes, KB, MB, GB, TB, PB.
And More
Force, frequency, angle, fuel efficiency — all built on Apple's Foundation Measurement system for accuracy.
How to Use
Pick a category — Tap the category name at the top to open the category picker.
Select units — Choose your source and target units (e.g., kilometers to miles).
Enter a value — Use the keypad to type a number. The conversion appears instantly.
Swap direction — Tap the swap arrow to reverse the conversion.
Frequently Asked Questions
How many unit categories are included?
14+ categories covering length, weight, temperature, volume, speed, energy, power, pressure, force, area, time, frequency, angle, fuel efficiency, and data storage.
Does it need an internet connection?
No. Unit Converter works entirely offline. It uses Apple's Foundation Measurement framework for accurate conversions, so no network request is ever made.
Is it really free and ad-free?
Yes. Completely free, no ads, no tracking, no paywall. It's a pure utility.
How accurate are the conversions?
They use Apple's built-in Foundation Measurement API, which is the same library iOS uses for system-wide unit conversions. Precision matches industry standards.
Can I add custom units?
Not currently. The app covers the standard Foundation Measurement units. If there's a unit you need that's missing, let me know on Instagram or LinkedIn.
Privacy
Unit Converter performs all calculations on-device. No data is stored, collected, or transmitted. It's a pure utility with zero network activity.