The Quick Unit Convert Blog

Energy shows up as joules in physics, Calories on a cereal box, and BTUs on a furnace label. Here is how those units connect with exact factors, plus the capital-C trap that doubles confusion.

A nautical mile is not a sea-flavored version of a regular mile, and a knot is not just a fast speed. Here is how these navigation units connect to the planet itself, with exact conversions.

One meter equals exactly 3.280839895 feet. Here is how to use that factor correctly, convert the leftover inches, and avoid the rounding errors that trip people up.

The metric system scales in powers of ten while imperial units come from historical, irregular divisions. Here is how each one works and how to move between them.

Celsius, Fahrenheit, and Kelvin measure the same thing on different scales. Learn what sets them apart and the formulas that convert between all three.

A US cup is 236.588 ml, but a cup of flour weighs about 120 g while a cup of honey weighs 340 g. Here is how to convert cups, grams, milliliters, and oven temperatures correctly.

A practical, precise guide to converting kilograms to pounds, including the exact definition, quick mental shortcuts, real-world examples, and the errors people make most.

A US gallon and an Imperial gallon differ by about 20 percent, which makes liters-to-gallons conversion a common source of error. Here are the exact factors, worked examples, and the mistakes to avoid.

A byte is 8 bits, but a "megabyte" can mean 1,000,000 or 1,048,576 bytes depending on who is counting. Here is how data storage units really work and why your drive looks smaller than the label.

Four units dominate everyday speed: miles per hour, kilometers per hour, knots, and meters per second. Here are the exact conversion factors, why they are what they are, and how to switch between them without slipping a decimal.

Pressure shows up in pounds per square inch, bar, kilopascals, and more, and the units rarely match the gauge in front of you. Here are the exact factors and the gauge-versus-absolute trap that catches almost everyone.

One square foot equals exactly 0.09290304 square meters, and one square meter equals about 10.7639 square feet. Here is why you must square the factor, plus worked examples for rooms, apartments, acres, and hectares.

Power is energy per second: 1 watt equals 1 joule per second. Here is how watts, kilowatts, and the two kinds of horsepower relate, plus the kW-versus-kWh distinction that trips everyone up.

Degrees and radians both measure angles, but they answer different questions. Here is how to convert between them exactly, why radians are the natural unit in math and physics, and the slip-ups that quietly corrupt results.