At One Place

40 mph to km/h

40 miles per hour in kilometers per hour
40 mph = 64.37376 km/h
km/h = mph × 1.609344

40 miles per hour is 64.37376 kilometers per hour. To get there, multiply by 1.609344.

Values either side

Miles per hour near 40, converted to kilometers per hour.
Miles per hour Kilometers per hour
32 mph 51.49901
35 mph 56.32704
36 mph 57.93638
37 mph 59.54573
40 mph ← 64.37376
45 mph 72.42048
50 mph 80.4672
55 mph 88.51392
60 mph 96.56064

How the conversion works

The relationship is km/h = mph × 1.609344. Both units measure speed, so the conversion is a fixed factor that never changes.

Common questions

What is 40 mph in kilometers per hour?
40 mph is 64.37376 km/h.
How do you convert miles per hour to kilometers per hour?
Multiply by 1.609344.

Related pages

Sources

  1. Guide for the Use of the International System of Units (SP 811) — NIST (Public domain (US Government))
  2. The International System of Units (SI Brochure) — Bureau International des Poids et Mesures
  3. Calculated on this page — At One Place

How these figures are compiled and checked