Speed Conversions
Speed conversions are useful for driving abroad, aviation, and physics. Convert mph to km/h when traveling between countries with different speed limits, or use meters per second and knots for scientific and nautical applications. Choose a converter below.
Speed conversions explained
Speed is distance over time. Common units include kilometers per hour (km/h) and miles per hour (mph).
A quick reference: 1 mph equals about 1.60934 km/h.
Quick tips
- If you’re driving, mph is common in the U.S.; km/h is common elsewhere.
- For running, you may prefer pace (min/km or min/mi) — speed can be converted either way.
- Round to whole numbers for road signs; use decimals for training.
Try a converter below, or start with the most common conversions in this category.
km/h → mphKilometer per hour to Mile per hour
mph → km/hMile per hour to Kilometer per hour
m/s → km/hMeter per second to Kilometer per hour
km/h → m/sKilometer per hour to Meter per second
mph → m/sMile per hour to Meter per second
m/s → mphMeter per second to Mile per hour
kn → km/hKnot to Kilometer per hour
km/h → knKilometer per hour to Knot