Speed converter
Compare speeds expressed in metric, imperial and nautical units.
Your inputs
The editable example is illustrative. Enter your own dimensions, operating data, prices, and fees. Results update as you edit.
Calculations run in your browser. Inputs are not saved or sent to analytics.
How it works
- Converted value = × f₁ ÷ f₂; SI: m/s
- Worked example: 10 m/s = 36 km/h; 1 kn = 1.852 km/h
- Supported input limits: : 0 ≤ x ≤ 1,000,000,000,000
Input and formula key
Your result
Complete the inputs to see your result.
Assumptions and limitations
Speed is converted as distance per unit time. A knot means one international nautical mile per hour, while mph uses the international mile. No wind, current or route conditions are inferred; running pace is time per distance and uses a separate calculator.
Sources
- NIST — conversion factor conventions Sources reviewed: 2026-10-06
- NIST — conversion factor table B.8 Sources reviewed: 2026-10-06
