Length Converter

Convert length between metric and imperial units instantly.

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About this calculator

Length conversion bridges India's metric system with imperial holdouts in US construction (feet), aviation (nautical miles) and screen sizes (inches). Since 1959 all imperial units are defined exactly against the metre, so conversions are precise rather than approximate.

Formula

result = value × (from-unit factor ÷ to-unit factor), where factors are relative to the SI base unit.

Frequently Asked Questions

How exact are these conversions?

Factors use internationally agreed definitions — an inch is exactly 2.54 cm since 1959, a pound exactly 0.45359237 kg since 1959.

Why can't I enter zero or negatives?

Physical quantities here are magnitudes; negative lengths/weights are meaningless in this context.

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