Conversion Calculator
Convert between units of length, weight, temperature, volume, area, speed, and more. Select units in the left and right columns, then enter a value to convert.
Supported unit categories.
m, km, cm, mm, mi, yd, ft, in, nmi, ly
kg, g, mg, lb, oz, t, stone, carat
°C, °F, K, °R
L, ml, gal, fl oz, cup, pt, qt, m³
m², km², ft², mi², acre, ha
m/s, km/h, mph, knot, ft/s, Mach
s, ms, min, hr, day, wk, mo, yr
Pa, kPa, bar, psi, atm, torr
J, kJ, cal, kcal, Wh, kWh, BTU
W, kW, MW, GW, hp
bit, B, KB, MB, GB, TB, KiB, MiB
deg, rad, grad, mrad, arc min/sec
The Essentials of Unit Conversion
Unit conversion is a fundamental process in science, engineering, cooking, trade, and daily life. Because different regions and industries use different measurement systems—principally the Metric system (SI) and the Imperial system—converting values between units is a frequent necessity. This Conversion Calculator provides an instant, error-free utility to translate metrics across length, weight, volume, temperature, speed, area, time, and more.
Metric vs. Imperial Systems
The Metric system is decimal-based, using prefixes like centi-, milli-, and kilo- to scale measurements by factors of 10. The Imperial system, used primarily in the United States, relies on historic standards with varied scale factors (e.g., 12 inches in a foot, 3 feet in a yard, 16 ounces in a pound). Converting between these systems requires precise conversion constants. For instance, 1 inch is defined as exactly 2.54 centimeters, and 1 pound equals approximately 0.453592 kilograms.
Ensuring Precision in Multi-Unit Calculations
When performing scientific conversions, maintaining significant figures is crucial to prevent compounding rounding errors. This calculator processes conversions using high-precision floats and outputs results rounded to 10 significant digits, making it reliable for academic assignments, cooking recipes, travel calculations, and professional projects alike.
Frequently Asked Questions
This calculator covers multiple measurement categories: Length, Weight/Mass, Temperature, Volume, Area, Speed, Time, Pressure, Energy, Power, Data, and Angle.
Temperature conversions use these formulas: Celsius to Fahrenheit: F = (C × 9/5) + 32. Fahrenheit to Celsius: C = (F − 32) × 5/9. Celsius to Kelvin: K = C + 273.15. Kelvin to Celsius: C = K − 273.15.
Many unit conversion factors are irrational or repeating decimals. The calculator shows results to high precision, which is sufficient for most engineering, cooking, and everyday measurement tasks.
Mass is a measure of the amount of matter in an object (kilograms). Weight is the gravitational force acting on that mass. On the Moon, your mass stays the same but your weight is 1/6 of Earth's.
Yes. All common imperial-to-metric and metric-to-imperial conversions are supported. You can also type in either the From or To field — the conversion works bidirectionally.