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.