Unit Converter
Real-time conversion across length, weight, area, volume, temperature, speed, and data size. Handy when a recipe, blueprint, or weather forecast uses a unit you don't think in. Your input never leaves your browser.
How to use Unit Converter
Select a category, choose the "From unit" and "To unit", then enter a number. The result updates in real time. Press the ⇄ button to instantly swap the From and To units. Not sure where to start? Click one of the "Examples (click to try)" chips above the value field — it sets the category, units, and number for you and shows the result right away.
Worked example: Pick the "Length" category, set the From unit to "Mile" and the To unit to "Kilometer", then type 1 in the value field. The result shows 1.609344 (1 mile = 1.609 km). Change the value to 3 and it updates in place to 4.828032 — no Enter key needed.
Speed tip: Conversion runs live on every keystroke, so there's no button to press. Just edit the value and the result follows along, and changing a unit recalculates instantly.
- Length: Supports 9 units — m, km, cm, mm, mile, yard, feet, inch, and nautical mile.
- Weight: Supports 7 units — g, kg, mg, ton (t), pound (lb), ounce (oz), and monme.
- Area: Supports m², km², cm², mm², hectare (ha), are (a), tsubo, jo (tatami), and acre.
- Volume: Supports L, mL, m³, cm³, US gallon, US quart, US pint, cup (240 mL), tablespoon, and teaspoon.
- Temperature: Supports Celsius (℃), Fahrenheit (℉), and Kelvin (K).
- Speed: Supports km/h, m/s, mph, and knot.
- Data Size: Supports B, KB, MB, GB, and TB (using 1 KB = 1024 B).
Useful scenarios
- Convert cups and ounces in foreign recipes to metric units (mL, g)
- Convert inch and feet measurements for DIY materials to cm and m
- Convert Fahrenheit temperatures to Celsius before traveling abroad
- Check unit conversions for science or math homework and exam prep
What are tsubo, jo and monme?
Three of the units here come from Japan's traditional system and still show up in everyday Japanese life. Tsubo (坪) is the standard unit for floor area and land — 1 tsubo ≈ 3.306 m² (traditionally about two tatami mats), so apartment listings and house plans are usually quoted in tsubo. Jo (畳) is literally one tatami mat; room sizes are commonly given as "6 jo" rather than in square meters. This tool uses the Edo-size mat (1 jo = 1.5488 m², i.e. 176 cm × 88 cm), which varies a little by region. Monme (匁) is a traditional weight of 3.75 g, still used for pearls and some wholesale goods. Convert any of them to metric to get an intuitive feel for the size or weight.