Speed shows up in more unit systems than almost anything else you’ll convert — road signs, weather reports, aviation charts, and boat speedometers all default to something different. Our new Speed Converter handles all four at once.
- Two-way live conversion — type a number in either box and the other updates instantly; no “Convert” button to click.
- Swap in one click — flip the “From” and “To” units (and their values) without retyping anything.
- All four units, always visible — a reference table below the converter shows your value in km/h, mph, m/s, and knots simultaneously, so you don’t have to run the conversion four times.
- Exact conversion factors — km/h, mph, and knots are all defined as exact fractions of a meter per second (1⁄3.6, 0.44704, and 0.514444 respectively), not rounded approximations, so results are limited only by floating-point precision.
- Shareable links — your value and unit choice sync to the URL, so you can bookmark or share a specific conversion.
Try it with 100 km/h and you’ll see it’s about 62.137 mph, 27.778 m/s, and 53.996 knots — all in the same glance.