Common Speed Conversions: A Quick Reference Guide

4 min read•June 1, 2025•Reviewed: June 1, 2026

✓Reviewed by Apex Conversion Editorial Team · Last reviewed June 1, 2026

Speed conversions come up in driving, aviation, meteorology, sports, and engineering. This quick-reference guide covers all the key conversion factors and typical speeds across different contexts, so you can find the number you need without working through the math each time.

All Key Speed Conversion Factors

mph  → km/h: × 1.609344
km/h → mph:  × 0.621371
mph  → kn:   × 0.868976
kn   → mph:  × 1.150779
km/h → kn:   × 0.539957
kn   → km/h: × 1.852000  (exact)
m/s  → km/h: × 3.600000  (exact)
km/h → m/s:  × 0.277778
m/s  → mph:  × 2.236936
mph  → m/s:  × 0.447040

Reference Speeds by Context

Walking speed: approximately 3–4 mph (4.8–6.4 km/h). Running pace: 5–8 mph (8–13 km/h) for recreational runners; elite marathon pace is around 12–13 mph (19–21 km/h). Cycling: 12–18 mph (19–29 km/h) for casual riders; competitive road cycling 25–30 mph (40–48 km/h).

Cars: US urban limit 25–35 mph (40–56 km/h); US highway 65–70 mph (105–113 km/h); European motorway 130 km/h (81 mph). Aircraft: commercial cruising speed roughly 450–500 knots (520–575 mph / 830–925 km/h). Wind: Beaufort scale storm force starts at 48–55 knots (55–63 mph).

Quick Mental Conversion Tips

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mph ↔ km/h: multiply/divide by 1.6 for a fast estimate (within 0.6%).
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knots ↔ km/h: knots × 1.85 ≈ km/h. Easy to remember: 1 knot ≈ 2 km/h (rough), exact is 1.852.
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m/s ↔ km/h: exactly × 3.6. No rounding needed — this conversion is exact.
✓
m/s ↔ mph: multiply by 2.24 (or divide by 0.447).

Frequently Asked Questions

What is 60 mph in km/h?

60 mph equals approximately 96.56 km/h. Quick estimate: 60 × 1.6 = 96 km/h.

What is 100 km/h in m/s?

100 km/h ÷ 3.6 = 27.78 m/s. The conversion km/h → m/s is always exactly ÷ 3.6, or equivalently × 0.2778.

What is wind speed at hurricane force in km/h?

Hurricane-force winds begin at 64 knots (119 km/h / 74 mph) on the Beaufort scale. A Category 1 hurricane has sustained winds of 64–82 knots (119–153 km/h / 74–95 mph).

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