Measurement studio
Every measurement, beautifully understood.
Convert units instantly, see the difference drawn to scale, and check the exact factor behind every answer.
Eight everyday measurements. One careful engine.
Each converter pairs an instant answer with a drawing made to the real scale.
Length & distance
mm to miles, drawn on a dual ruler
Height
cm and feet + inches, side by side
Temperature
°C, °F and K on one thermometer
Weight & mass
grams to tons, on a balance
Area
square feet to acres, as a floor plan
Volume
cups to gallons, US and imperial
Speed
mph and km/h, felt on a moving road
Time
seconds to weeks, on a clock you can replay
See how it works
One length, three numbers.
The three bars are always the same physical length. Only the size of the unit changes, and so does the number. One meter is 3.2808 feet because each foot is exactly 0.3048 m, and 39.37 inches because each inch is exactly 0.0254 m.
Built to be trusted.
Documented factors
Every unit is defined exactly from NIST references, such as 1 in = 2.54 cm. Results are labeled Exact or Rounded.
Runs in your browser
Conversions are calculated on your device. What you type is never sent to a server.
Instant and light
Static pages, no trackers and no third-party scripts, so answers appear as you type.
No account, no cost
Every converter is free to use, with no sign-up and no email address.