Convert any unit, instantly.
A clean, accurate unit converter for length, weight, temperature, volume, area, speed, time, pressure, energy, medical and engineering units — all in one place.
1 Square Millimeters = 0.01 Square Centimeters
Popular conversions
One-tap shortcuts to the most-searched conversions on the web.
Length
Weight
All categories
From everyday units to specialized scientific measurements.
Length
Convert between metric and imperial length units including meters, feet, inches, miles, kilometers and more.
14 unitsWeight & Mass
Convert kilograms, pounds, ounces, grams, tons and other weight units instantly.
11 unitsTemperature
Convert temperatures between Celsius, Fahrenheit, Kelvin and Rankine.
4 unitsVolume
Convert liters, gallons, milliliters, cups, fluid ounces and other volume units.
15 unitsArea
Convert square meters, acres, hectares, square feet and other area measurements.
10 unitsSpeed
Convert mph, km/h, m/s, knots and other speed units.
6 unitsTime
Convert seconds, minutes, hours, days, weeks, months and years.
12 unitsPressure
Convert pascals, bars, psi, atmospheres, mmHg and other pressure units.
10 unitsEnergy
Convert joules, calories, kilowatt-hours, BTU and other energy units.
9 unitsPower
Convert watts, horsepower, kilowatts and other power measurements.
8 unitsDigital Storage
Convert bytes, kilobytes, megabytes, gigabytes, terabytes and bits.
10 unitsFrequency
Convert hertz, kilohertz, megahertz and gigahertz.
6 unitsAngle
Convert degrees, radians, gradians and other angular measurements.
6 unitsForce
Convert newtons, pounds-force, kilogram-force and dynes.
6 unitsTorque
Convert newton-meters, foot-pounds and inch-pounds for engineering torque values.
4 unitsDensity
Convert kg/m³, g/cm³, lb/ft³ and other density measurements.
5 unitsFuel Economy
Convert miles per gallon, liters per 100 km, kilometers per liter.
4 unitsBlood Glucose
Convert blood glucose between mg/dL and mmol/L for diabetes monitoring.
2 unitsCholesterol
Convert cholesterol values between mg/dL and mmol/L.
2 unitsWhy ConvertMyUnit?
Whether you're a student checking homework, an engineer working with precise tolerances, a nurse reading lab results, or a traveler converting recipes — accurate unit conversion matters. ConvertMyUnit was built to be fast, accurate, and stay out of your way. No popups, no forced signups, no clutter. Just instant conversions across every category that matters.
Built for accuracy
All conversion factors are sourced from internationally accepted standards (SI base units, NIST published constants, BIPM definitions). Calculations use 64-bit floating-point math and round to a sensible precision so you get answers you can trust — whether you're converting nanometers or light years.
Frequently asked questions
How accurate is the converter?
Conversions use internationally accepted factors and compute to 8 decimal places of precision. For unusual scientific units like electronvolts or parsecs, results round to scientific notation automatically.
Can I link to a specific conversion?
Yes. The URL updates as you convert — copy the address bar, or click the Share Link button. URLs follow the format /?from=m&to=cm&value=200 so anyone clicking will see the same conversion pre-filled.
Does it work offline?
Once a page loads, conversion happens entirely in your browser — no server round-trip needed. The page itself needs an initial network connection to load.
Are medical conversions reliable?
Medical conversions (blood glucose, cholesterol) use clinically standard factors. However, ConvertMyUnit is a reference tool — not a substitute for medical advice. Always confirm with a healthcare professional for clinical decisions.