Free Speed Calculator - Distance & Time Made Easy
Calculate speed, distance, or time using the speed formula. Convert between speed units like mph, km/h, m/s, and knots for travel and physics.
Quick Answer
Speed = distance ÷ time. 300 miles in 5 hours = 60 mph. Conversions: 1 mph = 1.609 km/h = 0.447 m/s.
Key Facts about Speed Calculator:
- Speed = distance / time
- 1 mph = 1.609 km/h
- 1 m/s = 2.237 mph
- 1 knot = 1.151 mph
- Average speed considers entire trip
Why Use Our Speed Calculator?
Complete speed calculations:
Speed Formula
Speed = distance ÷ time.
Distance
Calculate distance traveled.
Time
Calculate travel time.
Unit Conversion
mph, km/h, m/s, knots.
Instant Results
Get answers immediately.
100% Private
Your data stays private.
How to Speed Calculator in 3 Easy Steps
Calculate speed:
Enter Known Values
Any two of speed, distance, time.
Select Units
Choose your units.
Get Result
See calculated value.
Travel Planning
Calculate any variable
Unit conversions
Travel time planning
Physics calculations
Common Use Cases for Speed Calculator
Perfect for:
Frequently Asked Questions
Everything you need to know about our speed calculator
How do I calculate speed?
Speed = Distance ÷ Time
Speed = Distance / Time. If you travel 150 miles in 3 hours, speed = 150/3 = 50 mph. To find distance: D = S × T. To find time: T = D / S.
How do I convert mph to km/h?
mph × 1.609 = km/h
Multiply mph by 1.609 to get km/h. 60 mph = 96.5 km/h. To convert km/h to mph, divide by 1.609 or multiply by 0.621.
What is average speed vs instantaneous speed?
Average = total distance/time; instantaneous = current speed
Average speed is total distance divided by total time. Instantaneous speed is your speed at any specific moment (what your speedometer shows).
Still have questions? Try the tool yourself!
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