What is a Length Converter?
Screen sizes in inches, running distances in km, timber in feet — length units mix constantly, and approximations compound into real errors.
One input converts into every common metric and imperial unit at once, using exact definitions (1 inch = 25.4 mm).
How to use the Length Converter
- Enter a value.
- Pick its unit.
- Read every conversion in the table.
Frequently asked questions
Are the factors exact?
Yes — the inch is defined as exactly 25.4 mm, and everything else derives from that and the meter.
Feet-and-inches input?
Convert the parts separately for now (5'10" = 5×30.48 + 10×2.54 cm) — a combined input is planned.
Nautical miles?
Not yet — this covers everyday statute units.
How many decimals are shown?
Up to six meaningful digits; extreme values switch to scientific notation.