EVERYDAY
Area
Surface, land and cross-sectional area.
Try a decimal, 1e-9, 1/3, or 5 1/2.
Resultb → km²Convert barn to square kilometre
EVERYDAY · ENGINEERING · SCIENCE
Unit conversion. Made clear.
Start with a familiar unit, type a value, and get a dependable answer with sensible precision. Fractions and scientific notation are welcome.
520units ready to convert
HOW IT IS CALCULATED
Convert through square metre
Enter a barn value to calculate square kilometre with full internal precision before display rounding.
Display precisionAuto · 12 significant digits
Auto keeps up to 12 significant digits, trims unnecessary zeroes, and switches to scientific notation for extreme magnitudes.
QUICK REFERENCE
All units in this quantity
| Unit | Symbol | Converted value |
|---|---|---|
| square micrometrefrom b | µm² | Interactive |
| square millimetrefrom b | mm² | Interactive |
| square centimetrefrom b | cm² | Interactive |
| square decimetrefrom b | dm² | Interactive |
| square metrefrom b | m² | Interactive |
| arefrom b | a | Interactive |
| hectarefrom b | ha | Interactive |
| square kilometrefrom b | km² | Interactive |
| square inchfrom b | in² | Interactive |
| square footfrom b | ft² | Interactive |
| square yardfrom b | yd² | Interactive |
| acrefrom b | acre | Interactive |
| square milefrom b | mi² | Interactive |
| barnfrom b | b | Interactive |
SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.