Unit Converter
Convert length, area, and volume between metric and imperial units.
About the Unit Converter
Every conversion here works by routing through one metric base unit per category — meters for length, square meters for area, liters for volume — so any unit can convert to any other in the same category with a single multiplication against that base, rather than needing a separate formula for every possible pair. Area and volume conversions aren't simple linear scalings of their underlying length unit: since area is length squared, converting square meters to square feet multiplies by (3.28084)² ≈ 10.764, not by 3.28084 directly.
To use it: pick a category with the buttons — length spans meters through miles, area covers square meters through acres and hectares, and volume covers liters through gallons, quarts, pints, and cups — then enter a value and its starting unit, and every other unit in that category updates simultaneously below. For example, entering 1 hectare instantly shows 10,000 square meters, roughly 2.47 acres, and about 107,639 square feet, all computed from the same underlying value. Switching categories resets to a sensible default unit so you're not left converting a length figure as if it were a volume.
Which categories are supported?+−
Length (metric and imperial), area (square meters, square feet, acres, hectares), and volume (liters, gallons, quarts, pints, cups).
Is a US gallon the same as a UK gallon?+−
No — this converter uses US customary units (a US gallon is about 3.785 liters), which differs from the UK imperial gallon (about 4.546 liters). Keep that in mind if you're converting for a UK or Commonwealth context.
Why does converting area work differently from converting length?+−
Area scales with the square of a length ratio, not the ratio itself — since 1 meter = 3.28 feet, 1 square meter equals 3.28² ≈ 10.76 square feet, not 3.28 square feet. This converter applies the correct squared factor automatically.
How precise are the conversion factors used?+−
Each category converts through one metric base unit (meters for length, square meters for area, liters for volume) using standard internationally defined conversion constants, so results are accurate to floating-point precision, not rounded approximations.
What is the difference between a hectare and an acre?+−
A hectare is exactly 10,000 square meters. An acre is a US customary unit equal to about 4,046.86 square meters — so one hectare is roughly 2.47 acres.
Can I convert between categories, like length into volume?+−
No — length, area, and volume are physically different dimensions and can't be converted into each other directly. Switch categories using the buttons above to convert within the category you need.