Knots to mph Converter
Convert knots to miles per hour for aviation, boating, and weather wind speed.
How It Works
Formula: kn to mph = value × 1.15077945
Example: 1 kn = 1.150779 mph
Note: 1 knot equals 1.1508 miles per hour, based on the nautical mile used in aviation and boating.
Common Uses
Quick Conversion Table
| kn | mph |
|---|---|
| 10 | 11.5078 |
| 30 | 34.5234 |
| 60 | 69.0468 |
| 65 | 74.8007 |
| 80 | 92.0624 |
| 100 | 115.0779 |
| 120 | 138.0935 |
Rounding Rule
Rounded to 4 decimal places
Error Margin
±0.0001 mph
Precision Guidance
For aviation, keep 2 decimals. For wind reports, round to 1 decimal.
Common Mistakes
A knot is based on the nautical mile (1.852 km), not the statute mile (1.609 km). Do not treat knots and mph as equal.
Frequently Asked Questions
What is 1 knot in mph?
1 knot equals 1.1508 mph using the conversion (1 knot = 1 nautical mile per hour = 1.15078 mph).
How do I convert knots to mph?
Multiply the knot value by 1.1508. For example, 30 kn × 1.1508 = 34.52 mph.
Why do planes use knots?
Aviation and maritime use knots because the nautical mile matches latitude lines on charts.
Is a knot faster than mph?
Yes, 1 knot (1.15 mph) is slightly faster than 1 mph.
Deep Dive Guide
Knots to MPH Conversion: Guide for Aviation and Marine Speeds
Convert knots to mph for aviation and marine weather reading. 1 knot equals 1.15078 mph, so 20 knots equals 23.02 mph in this practical guide.
Read Full Guide →More Converters You May Like
Exact Constants & Authoritative Sources
Every conversion on this page uses the fixed, internationally agreed constants below — drawn from NIST and the SI Brochure. No values are estimated or rounded as if exact. See the full list on our Sources & Standards page.
- EXACT1 mile per hour (mph) = 1.609344 km/h (exact, 1 mi/h)
- EXACT1 mph = 0.44704 metres per second (exact)
- EXACT1 km/h = 1/3.6 m/s (exact reciprocal)
- EXACT1 knot = 1.852 km/h (exact, 1 nautical mile/h)
Common Pitfalls & How to Avoid Them
mph vs. km/h is not a 2× rule
1 mph = 1.609344 km/h. A 60 mph limit is 96.56 km/h, not 120. The factor is ~1.6, not 2.
Knots are nautical
Aviation and marine speeds use knots (1.852 km/h). Confusing a 30-knot wind with 30 mph understates it by ~17%.
A unit-conversion reference site has no manufacturer-specific or device calibration parameters, so "layered tuning" does not apply here. The only real error-handling is input validation: the converter rejects non-numeric, empty, or out-of-range entries and shows a clear message, then falls back to exact constants above. No estimated or rounded figures are ever presented as exact.
Authoritative sources for this page
- NIST (U.S. National Institute of Standards and Technology) — NIST SP 330 — The International System of Units (SI), 2019 edition
- BIPM (International Bureau of Weights and Measures) — SI Brochure — The International System of Units (9th edition)
Last Updated 2026 | This converter was reviewed for accuracy