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Speed Distance Time Calculator - Free Online Tool

Speed · Distance · Time Calculator

Calculate speed, distance, or time from the other two values

Speed = Distance ÷ Time

Distance

Distance unit

Hours

Minutes

Select what you want to calculate (speed, distance, or time)

Enter the other two known values

Choose units and click 'Calculate'

Results are automatically converted to multiple units

Road Trip Planning

Calculate how long a 400km drive at 100km/h will take — about 4 hours, plus rest stops for your travel plan.

Running Pace

To finish a marathon (42.195km) in 4 hours, you need about 10.5km/h or ~5:42 per kilometer pace.

Flight Time Estimate

A 1,200km flight at 900km/h average speed takes about 1 hour 20 minutes.

For road trips, use average speed accounting for traffic and stops
Average walking speed is 4-5km/h, running is 8-12km/h
Unit conversion: 1 m/s = 3.6 km/h
Aircraft speeds differ between airspeed and ground speed
For nautical speed, use knots: 1 knot = 1.852 km/h

Speed (v) = Distance (d) ÷ Time (t)
Distance (d) = Speed (v) × Time (t)
Time (t) = Distance (d) ÷ Speed (v)
These formulas apply to uniform motion (constant speed)
In real travel, average speed accounts for acceleration and stops

Frequently Asked Questions

How do I convert between km/h and m/s?

Divide km/h by 3.6 to get m/s. For example, 108 km/h = 30 m/s. Multiply m/s by 3.6 to get km/h.

What's the difference between average and instantaneous speed?

Average speed is total distance divided by total time. Instantaneous speed is speed at a specific moment. This calculator uses average speed (uniform motion).

How do I convert between miles and kilometers?

1 mile = approximately 1.609 km. Multiply mph by 1.609 for km/h, or divide km/h by 1.609 for mph.

What is the speed of light?

The speed of light is approximately 299,792,458 m/s (~300,000 km/s), or about 1,079,252,849 km/h. It's the fastest speed in physics.

What is the speed of sound (Mach)?

At standard conditions (sea level, 15°C), Mach 1 is approximately 343 m/s or about 1,235 km/h. Mach numbers are commonly used for aircraft speeds.

Can this calculator compute acceleration?

This calculator is for uniform motion (constant speed) only. Acceleration requires a different formula: a = Δv/Δt, using initial speed, final speed, and time.

Important Notice

This calculator assumes uniform motion (constant speed).
Actual travel times may vary due to traffic, signals, and rest stops.
For aviation or maritime calculations, use specialized tools.

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