This converter turns any length into all the others through the meter as an exact base unit. Metric steps by powers of ten (1 km = 1000 m, 1 m = 10 dm = 100 cm = 1000 mm = 1,000,000 μm = 1,000,000,000 nm). Imperial units use exact international definitions: 1 inch = 25.4 mm, 1 foot = 12 inch = 0.3048 m, 1 yard = 3 foot = 0.9144 m, 1 mile = 1760 yard = 1609.344 m. The nautical mile is 1852 m exactly.
Chinese market units follow the modern metric-aligned definitions: 1 li = 500 m, 1 chi (尺) = 1/3 m ≈ 0.3333 m, and 1 cun (寸) = 1/30 m ≈ 0.0333 m, so 1 chi = 10 cun. Every result keeps 12 significant figures to remove floating-point noise, and switches to scientific notation only for extreme magnitudes. All math runs locally in your browser; nothing is uploaded.