Speed Calculator

Romik Amreliya

Calculate speed, distance, or time — just enter any two values to find the third.

Distance

Unit

Time (Hours)

Minutes

What is the Speed Calculator?

The speed calculator solves the fundamental physics equation relating speed, distance, and time. Enter any two values to instantly find the third. It supports multiple units including km/h, mph, and m/s, making it useful for everything from planning road trips to solving physics problems.

Speed, Distance & Time Formulas

Speed = Distance ÷ Time

Distance = Speed × Time · Time = Distance ÷ Speed

These three equations are all rearrangements of the same relationship. This calculator automatically uses the correct formula based on which tab you select — Find Speed, Find Distance, or Find Time.

Step-by-Step Examples

Example 1: Finding Speed — Mumbai to Pune Drive

Distance: 150 km

Time: 2 hours 30 minutes = 2.5 hours

Speed: 150 ÷ 2.5 = 60 km/h

That's 37.28 mph or 16.67 m/s

Example 2: Finding Time — Marathon Runner

Distance: 42.195 km (full marathon)

Speed: 12 km/h (5-minute per km pace)

Time: 42.195 ÷ 12 = 3h 31m

Common Speed Conversions

1 km/h = 0.621 mph = 0.278 m/s
1 mph = 1.609 km/h = 0.447 m/s
1 m/s = 3.6 km/h = 2.237 mph

Real-Life Use Cases

Road trip planning: Calculate arrival time based on distance and average speed, or determine the speed needed to arrive on time.
Running and fitness: Convert your pace (minutes per km) to speed (km/h) and track your improvement over time.
Flight and travel: Estimate flight duration between cities knowing the distance and aircraft cruising speed (~900 km/h for commercial jets).
Physics homework: Solve speed-distance-time problems with multiple unit conversions built in.
Cycling: Determine your average cycling speed across a route, or estimate how far you can ride in a given time.

Speed Reference Points

Walking: 5 km/h (3.1 mph)
Jogging: 8-10 km/h (5-6.2 mph)
City driving: 30-50 km/h (19-31 mph)
Highway driving: 80-120 km/h (50-75 mph)
High-speed train: 250-350 km/h (155-217 mph)
Commercial aircraft: 800-950 km/h (500-590 mph)
Speed of sound: 1,235 km/h (767 mph)

Frequently Asked Questions

Average speed = Total distance ÷ Total time. For example, if you travel 150 km in 2 hours, your average speed is 75 km/h.

Speed is a scalar quantity (magnitude only), while velocity is a vector quantity (magnitude + direction). Speed tells you how fast, velocity tells you how fast and in which direction.

RA

Written & Reviewed by Romik Amreliya

Software Engineer & Data Analyst. Dedicated to building precise, privacy-first web calculators based on standardized financial and medical algorithms. All tools and content undergo rigorous testing against industry-standard benchmarks.

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Note: This speed calculator is provided for educational and general-purpose use. It assumes constant speed over the entire distance, which may not reflect real-world driving conditions with varying speeds, stops, and traffic. For safety-critical applications such as aviation or navigation, always use certified professional instruments.