Speed Conversion Chart
Quick-reference speed conversion chart. The tables below compare the most common units side by side. Download the free PDF for offline and printable use.
Standards and method
Values are calculated from the shared conversion-factor library. Exact defined relationships are preserved; displayed results are rounded only for readability.
Maintained by Miguel Coelho. Updated . See our editorial policy.
Printable speed conversion chart
km/h, mph, m/s, knots and ft/s, with the Beaufort wind scale. Includes the exact definition, formulas, a worked example and sources. Conversion values are checked against the defining constants, and reference data is cited to its source, before the PDF is published.
Free to print, share and use in teaching materials with attribution (CC BY 4.0).
Also in the Pilot Reference Pack, with related sheets in one PDF.
Speed Conversion Table
| Unit | per 1 km/h | per 1 mph | per 1 m/s |
|---|---|---|---|
| Meter per Second (m/s) | 0.277778 m/s | 0.44704 m/s | 1 m/s |
| Kilometer per Hour (km/h) | 1 km/h | 1.60934 km/h | 3.6 km/h |
| Mile per Hour (mph) | 0.621371 mph | 1 mph | 2.23694 mph |
| Knot (kn) | 0.539957 kn | 0.868976 kn | 1.94384 kn |
| Foot per Second (ft/s) | 0.911344 ft/s | 1.46667 ft/s | 3.28084 ft/s |
Values are calculated from the shared conversion-factor library. Exact defined relationships are preserved; displayed results are rounded only for readability.
Full speed conversion chart
km/h, mph, m/s, knots and ft/s, with the Beaufort wind scale. These are the same tables as the printable PDF. For: Drivers, pilots, sailors, cyclists and weather watchers.
- Exact definition
- 1 mph = 1.609 344 km/h; 1 kn = 1.852 km/h; 1 m/s = 3.6 km/h (all exact)
- Formula
- mph = km/h ÷ 1.609 344; km/h = m/s × 3.6
- Reverse
- km/h = mph × 1.609 344; kn = km/h ÷ 1.852
- Worked example
- 100 km/h = 62.14 mph = 27.78 m/s = 54.0 kn
- Rounding
- Matrix values use 6 significant figures; tables to 1–2 decimal places.
Conversion factor matrix
Read across: 1 unit in the left column equals the value shown in each column unit.
| 1 unit = | m/s | km/h | mph | kn | ft/s |
|---|---|---|---|---|---|
| 1 m/s | 1 | 3.6 | 2.23694 | 1.94384 | 3.28084 |
| 1 km/h | 0.277778 | 1 | 0.621371 | 0.539957 | 0.911344 |
| 1 mph | 0.44704 | 1.60934 | 1 | 0.868976 | 1.46667 |
| 1 kn | 0.514444 | 1.852 | 1.15078 | 1 | 1.68781 |
| 1 ft/s | 0.3048 | 1.09728 | 0.681818 | 0.592484 | 1 |
km/h to mph, m/s and knots
| Kilometres per hour (km/h) | Miles per hour (mph) | Metres per second (m/s) | Knots (kn) |
|---|---|---|---|
| 10 | 6.2 | 2.78 | 5.4 |
| 20 | 12.4 | 5.56 | 10.8 |
| 30 | 18.6 | 8.33 | 16.2 |
| 40 | 24.9 | 11.11 | 21.6 |
| 50 | 31.1 | 13.89 | 27.0 |
| 60 | 37.3 | 16.67 | 32.4 |
| 70 | 43.5 | 19.44 | 37.8 |
| 80 | 49.7 | 22.22 | 43.2 |
| 90 | 55.9 | 25.00 | 48.6 |
| 100 | 62.1 | 27.78 | 54.0 |
| Kilometres per hour (km/h) | Miles per hour (mph) | Metres per second (m/s) | Knots (kn) |
|---|---|---|---|
| 110 | 68.4 | 30.56 | 59.4 |
| 120 | 74.6 | 33.33 | 64.8 |
| 130 | 80.8 | 36.11 | 70.2 |
| 140 | 87.0 | 38.89 | 75.6 |
| 150 | 93.2 | 41.67 | 81.0 |
| 160 | 99.4 | 44.44 | 86.4 |
| 170 | 105.6 | 47.22 | 91.8 |
| 180 | 111.8 | 50.00 | 97.2 |
| 190 | 118.1 | 52.78 | 102.6 |
| 200 | 124.3 | 55.56 | 108.0 |
mph to km/h
| Miles per hour (mph) | Kilometres per hour (km/h) |
|---|---|
| 5 | 8.0 |
| 10 | 16.1 |
| 15 | 24.1 |
| 20 | 32.2 |
| 25 | 40.2 |
| 30 | 48.3 |
| 35 | 56.3 |
| 40 | 64.4 |
| 45 | 72.4 |
| 50 | 80.5 |
| Miles per hour (mph) | Kilometres per hour (km/h) |
|---|---|
| 55 | 88.5 |
| 60 | 96.6 |
| 65 | 104.6 |
| 70 | 112.7 |
| 75 | 120.7 |
| 80 | 128.7 |
| 85 | 136.8 |
| 90 | 144.8 |
| 95 | 152.9 |
| 100 | 160.9 |
| Miles per hour (mph) | Kilometres per hour (km/h) |
|---|---|
| 105 | 169.0 |
| 110 | 177.0 |
| 115 | 185.1 |
| 120 | 193.1 |
| 125 | 201.2 |
| 130 | 209.2 |
| 135 | 217.3 |
| 140 | 225.3 |
| 145 | 233.4 |
| 150 | 241.4 |
Beaufort wind scale
| Force | Description | Knots | km/h |
|---|---|---|---|
| 0 | Calm | < 1 | < 1 |
| 1 | Light air | 1–3 | 1–5 |
| 2 | Light breeze | 4–6 | 6–11 |
| 3 | Gentle breeze | 7–10 | 12–19 |
| 4 | Moderate breeze | 11–16 | 20–28 |
| 5 | Fresh breeze | 17–21 | 29–38 |
| 6 | Strong breeze | 22–27 | 39–49 |
| Force | Description | Knots | km/h |
|---|---|---|---|
| 7 | Near gale | 28–33 | 50–61 |
| 8 | Gale | 34–40 | 62–74 |
| 9 | Strong gale | 41–47 | 75–88 |
| 10 | Storm | 48–55 | 89–102 |
| 11 | Violent storm | 56–63 | 103–117 |
| 12 | Hurricane force | ≥ 64 | ≥ 118 |
Sources for this chart
Conversion values on this sheet are generated by the AllUnitConversions conversion library and automatically checked against the exact definitions above before the PDF is produced; reference tables are taken from the sources listed.
- International Yard and Pound Agreement (1959) — 1 in = 25.4 mm, 1 ft = 0.3048 m, 1 lb = 0.453 592 37 kg exactly
- NIST Special Publication 811 — Guide for the Use of the International System of Units
- World Meteorological Organization — Beaufort wind force scale (knots); Met Office km/h equivalents
Related Converters & Charts
Speed Conversion Chart FAQs
Common questions about the speed conversion chart.
What does this speed conversion chart include?
It lists the most common speed units side by side with their conversion factors, plus a free printable PDF you can download for offline reference.
What exact definition is this speed chart based on?
1 mph = 1.609 344 km/h; 1 kn = 1.852 km/h; 1 m/s = 3.6 km/h (all exact). Formula: mph = km/h ÷ 1.609 344; km/h = m/s × 3.6. Matrix values use 6 significant figures; tables to 1–2 decimal places.
Can I download this chart as a PDF, CSV, or JSON?
Yes. Use the Download A4 PDF or US Letter PDF buttons for a printable version, or download the same tables as CSV or JSON from the links on this page.