Unit Converter
Convert between units across 17 categories — length, mass, volume, time, speed, area, energy, power, pressure, force, frequency, angle, temperature, data storage, density, fuel economy, cooking.
How to Use
- Pick a category — length, mass, temperature, etc.
- Pick From and To units. Type on either side; the other updates live.
- Shareable URL: add ?category=X&from=Y&to=Z to deep-link any pair.
Show Work
17 categories, one tool
Convert between units across length, mass, volume, time, speed, area, energy, power, pressure, force, frequency, angle, temperature, data storage, density, fuel economy, and cooking. All conversions run locally in your browser.
Deep-link any pair via ?category=X&from=Y&to=Z. Conversion table on the right shows the entered value in every unit of the current category.
Popular conversions
About the Unit Converter
Need a hand with everyday maths and number work? The Unit Converter does the work for you — free, and right here in your browser. Convert between units across 17 categories — length, mass, volume, time, speed, area, energy, power, pressure, force, frequency, angle, temperature, data storage, density, fuel economy, cooking.
How it works
Enter a number and choose your units — the converted value shows instantly. Everything runs locally, so nothing you type leaves your device. Double-check the direction of the conversion and you are set.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
Is temperature handled correctly?
Yes — temperature uses affine conversions (°F has an offset of 32). Celsius, Fahrenheit, Kelvin, Rankine, Réaumur all supported.
L/100km is odd — higher means less efficient?
Correct — it is an inverse measure (volume per distance). The tool inverts correctly when converting between km/L or mpg and L/100km.
KB (decimal) vs KiB (binary)?
Both available. 1 KB = 1000 B. 1 KiB = 1024 B. Matters for file size vs disk capacity claims.
How do I use the Unit Converter?
Simply type or paste your value and read the result, which refreshes the instant you change something. There is nothing to submit and nothing to wait for.
Is it free? Does it work without internet?
Yes to both. It is free with no sign-up, and once the page has loaded it keeps working even with no internet.
Where does my data go?
Nowhere — every calculation runs on your own device. Nothing you enter is uploaded, logged, or stored.
Common Use Cases
Quick daily converts
Kilos → pounds, miles → km, °F → °C.
Engineering
Pressure (psi/bar/kPa), power (hp/kW), torque via force × length.
Deep-link a pair
Bookmark ?category=length&from=meter&to=foot.
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