Every General Measurements Tool, One Place
22 free unit converter and calculator tools — instantly convert length, weight, temperature, area, speed, and more, with exact standard conversion factors.
Area & Volume2
Square feet, acres, cups, liters, gallons — area and volume in one place.
Construction2
Paint, tile, and other material calculators for DIY and pros.
Cooking2
Cups, tablespoons, grams — with ingredient-aware conversion.
Health & Body2
BMI, BMR, and body metric calculators.
Length & Distance6
Inches, feet, meters, miles — convert any length unit, both ways.
Ratio & Percent1
Percentages, ratios, and quick calculations.
Speed, Time & Data3
Speed, time, and digital data sizes — all covered.
Temperature1
Celsius, Fahrenheit, Kelvin, Rankine — all four temperature scales.
Weight & Mass3
Pounds, kilograms, ounces, grams — fast and accurate.
Why These Conversions Are Accurate
Every tool on this page uses the exact international standard conversion factor for its units — not a rounded estimate. 1 inch is calculated as precisely 2.54 centimeters, 1 pound as precisely 0.45359237 kilograms, the same figures engineers, scientists, and international standards bodies use, not a simplified approximation.
Results update instantly as you type, with no page reload and no signup required. Each converter also shows the reverse calculation and common reference values side by side, so a number like "25.4 mm" is easy to sanity-check against the unit you started with.
Ready to See These Numbers Compared?
Converting is only half the picture. General Measurements also shows real, scale-accurate visual comparisons — so a converted number actually means something.
cm to inches · kg to lbs · Celsius to Fahrenheit · meters to feet — 30+ free tools, 9 categories, no signup required