Unit Converter
Convert length, weight, temperature and more
🔒 100% free · no signup · files never leave your device
The world runs on two measurement systems at once. A recipe from the US lists cups and Fahrenheit while your kitchen scale shows grams; a product spec sheet quotes inches when your workshop is metric; a travel site gives distance in miles to someone who thinks in kilometers. Temperature is the special case: unlike length or weight, it uses offsets as well as ratios (0°C is 32°F, not some multiple of it), which is why quick mental math so often goes wrong.
This free unit converter handles length, weight, temperature, area, volume and speed with both metric and imperial units, using exact official conversion factors accurate to six significant digits. Results update instantly as you type or switch units, and you can convert in either direction without re-entering anything. Whether you're checking kg to lbs for a luggage limit, converting miles per hour to km/h for a rental car, or translating a 350°F oven to Celsius, the answer is immediate — no app install, no signup, no ads between you and the number.
Why use Unit Converter
Cooking with international recipes
Convert cups to milliliters, ounces to grams and Fahrenheit to Celsius so a foreign recipe works with your local equipment.
Checking airline baggage limits
Airlines state limits in kg or lbs depending on region — a quick kg to lbs conversion avoids surprise overweight fees at the airport.
Shopping from foreign stores
Clothing sizes, screen dimensions and parcel weights convert instantly when ordering from international marketplaces.
Engineering and DIY calculations
Converting between square feet and square meters, or PSI-adjacent speed and torque units, keeps project specs consistent.
Pro tips
- For temperature, remember it's not proportional: the tool handles the 32-degree offset — doing it mentally with just multiplication is the classic mistake.
- 1 kg ≈ 2.205 lbs and 1 inch = 25.4 mm exactly — memorizing these two anchors lets you sanity-check any conversion.
- Watch significant digits: a result of 3.280840 ft for 1 m doesn't mean your measurement was that precise.
- Speed conversions chain two units (distance and time) — 100 km/h ≈ 62 mph, the single most useful one for driving abroad.
How to use Unit Converter
- 1Pick a measurement type
- 2Enter a value
- 3Choose from/to units
- 4Read the instant result
Frequently Asked Questions
Which measurement types are supported?▾
Length, weight, temperature, area, volume and speed with all common metric and imperial units.
How accurate are the results?▾
Conversions use exact official conversion factors with up to 6 significant digits.