Length Converters

Convert astronomical distances between AU, light-years, parsecs, kilometers, miles, and light-time units. Includes light-travel time, cosmic scale visualization, and real-world distance comparisons (Earth-Moon to Andromeda).

Convert a height in centimeters to feet and inches. See the calculation steps, a visual height comparison and a chart of common heights.

Instantly convert centimeters (cm) to inches with our free online converter. Includes conversion formula, visual ruler guide, and common conversions.

Convert feet and inches to centimeters instantly with visual height comparison, multi-unit output (cm, meters, total inches), and common height reference examples.

Instantly convert feet to meters with visual comparison scale, feet and inches input support, metric breakdown (centimeters/millimeters), and common length reference examples.

Convert inches to centimeters instantly with interactive visual scale, fractional inch support, multiple output units (cm, mm, m), and real-world size comparisons.

Convert inches to millimetres, including fractions like 3 1/2, 1/4 or 3/8 and mixed numbers. See the exact value on an aligned dual inch-and-mm ruler, plus cm, metres, thou and the nearest 1/16 inch. 1 inch = 25.4 mm exactly.

Convert kilometres to miles and back. Built for runners, with one-tap presets for 5K, 10K, half marathon, marathon and ultra distances, a dual-scale ruler showing both units at once, and automatic race recognition.

Instantly convert meters to feet with visual comparison scale, feet and inches breakdown, fractional inch display, and common length reference examples.

Convert miles to kilometres and back. Built for drivers and travellers, with one-tap distance presets, a dual-scale road ruler showing both units at once, and automatic road-sign speed recognition from mph to km/h.

Convert millimetres to inches as a decimal and as the nearest fraction (1/16, 1/32, 1/64). See where the measurement lands on an animated ruler, how much rounding error the fraction adds, plus cm, feet-and-inches and metres.