Convert between common units for distance, weight, temperature, and volume.
Pick a category (length, weight, temperature, or volume), choose the units to convert from and to, enter a value, and click Convert. Length covers meters, kilometers, miles, and feet; weight covers kilograms, grams, pounds, and ounces; volume covers liters, milliliters, gallons, and cups; temperature covers Celsius, Fahrenheit, and Kelvin.
Gallons and cups here use US customary definitions, which differ from UK imperial gallons and cups. If you're converting for a UK recipe or fuel figure, double-check which standard you actually need — the numbers won't match imperial measurements.
Converting Celsius to Fahrenheit follows °F = °C × 9/5 + 32 — not a simple multiplier, because the two scales don't share a zero point. Normal human body temperature, 37°C, comes out to exactly 98.6°F using that formula (37 × 9/5 + 32 = 98.6). Length, weight, and volume conversions skip that "+32" step entirely, since 0 meters and 0 feet both mean "no distance at all" — 0°C and 0°F don't share that same starting point, which is exactly why temperature needs its own formula per unit pair instead of one shared multiplier.
Length, weight, and volume are all straightforward ratios against a base unit. Temperature scales don't share a common zero point, so Celsius, Fahrenheit, and Kelvin need their own conversion formulas instead of a simple multiplier.
Length, weight, and volume results are shown to 4 decimal places; temperature results are shown to 2 decimal places.
No, conversions only work within the same category, since units from different categories (like kilograms and liters) aren't directly convertible without knowing a substance's density.
Celsius to Fahrenheit is °F = °C × 9/5 + 32. Normal human body temperature, 37°C, works out to 37 × 9/5 + 32 = 98.6°F exactly. The "+32" offset is why temperature can't use a simple multiplier the way length or weight can — Celsius and Fahrenheit don't share a zero point, so every conversion has to shift the scale as well as rescale it.