Speed Calculator
Calculate speed, velocity, and convert between speed units. Free, fast, accurate — no signup, mobile-friendly, works in
Basic Calculation
Result
Speed Facts
- • Speed = Distance ÷ Time
- • Velocity includes direction, speed is magnitude only
- • Acceleration is the rate of change of velocity
- • Air resistance increases with the square of speed
- • Sound travels at ~343 m/s in air at room temperature
Speed Analysis
Speed
2.78 m/s
Distance
100000.00 m
Time
36000.00 seconds
Unit Conversions
Speed:
Speed Comparisons
Record Comparison
Pace Analysis
Performance Tips
- • Regular maintenance improves performance
- • Weather conditions affect optimal speeds
🏃 Speed & Motion Tips
- • Always consider safety when increasing speed
- • Factor in environmental conditions and terrain
- • Gradual acceleration is more efficient than sudden bursts
- • Regular maintenance improves performance
- • Track your progress over time for improvement
- • Consider energy efficiency and environmental impact
How it works
A speed calculator relates speed, distance, and time. Speed is distance divided by time; rearranged, the same relationship finds distance (speed × time) or time (distance ÷ speed).
Speed, distance, time
Speed = distance ÷ time Distance = speed × time Time = distance ÷ speed
- distance
- how far traveled
- time
- how long it took
Worked example
- Traveled 150 miles
- In 2.5 hours
- Speed = 150 ÷ 2.5
Average speed = 60 mph.
Good to know
- This gives average speed over the whole trip, not the speed at any instant.
- Keep units consistent — miles with hours give mph; km with hours give km/h.
- Convert mph to km/h by multiplying by 1.609.
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Frequently Asked Questions
How do I calculate speed?
Speed equals distance divided by time: v = d/t. Driving 150 miles in 2.5 hours averages 150 / 2.5 = 60 mph. Keep units consistent — miles with hours, or meters with seconds.
How do I convert between mph, km/h, and m/s?
Multiply mph by 1.609 to get km/h (and divide to go back). For m/s, multiply by 3.6 to get km/h: 10 m/s = 36 km/h ≈ 22.4 mph.
How do I find average speed for a trip with different legs?
Divide total distance by total time — never average the speeds. Driving 60 miles at 60 mph then 60 miles at 30 mph averages 40 mph, not 45, because you spend longer at the slower speed.
How do I solve for time or distance instead?
Rearrange the formula: t = d/v and d = v x t. A 240-mile trip at 60 mph takes 4 hours; cycling at 15 mph for 1.5 hours covers 22.5 miles.
What is the difference between speed and velocity?
Speed is a scalar — just how fast. Velocity is a vector that includes direction, so a car circling a track at constant speed has changing velocity. For everyday trip math, speed is what you need.