Work out speed, distance or time in seconds. Enter the distance and the time to see your speed in kilometres per hour and metres per second, plus your pace per kilometre.
Enter time in hours: 30 minutes is 0.5 hours, 45 minutes is 0.75 hours, and 1 hour 30 minutes is 1.5 hours.
1. Enter the distance in kilometres. 2. Enter the time in hours (30 minutes is 0.5). 3. Click Calculate Speed to see your speed in km/h and m/s.
Speed is one of the simplest ideas in maths: how far you travel in how much time. But in daily life we need it everywhere — how fast a car is going, how long a journey will take, how fast a runner is, or whether a delivery will arrive on time. This free speed calculator works it out for you: enter the distance and the time, and it shows your speed in kilometres per hour and metres per second, plus your pace in minutes per kilometre, which runners love.
The formula is easy: speed = distance divided by time. If you travel 100 km in 2 hours, your speed is 50 km/h. The same idea works for walking, running, cycling and driving, and for any unit: metres per second is used in science and sport, while kilometres per hour is used on road signs and car speedometers.
Suppose you run 10 km in 30 minutes. First convert the time to hours: 30 minutes is 0.5 hours. Then speed is 10 divided by 0.5, which is 20 km/h. In metres per second, that is 20 times 1,000 divided by 3,600, which is about 5.56 m/s. Your pace is 30 minutes divided by 10 km, which is 3 minutes per kilometre. Try it in the calculator above: enter 10 km and 0.5 hours, and check that your result matches 20 km/h and 3 min per km.
Take a car journey: you drive 240 km in 3 hours. The speed is 240 divided by 3, which is 80 km/h. In metres per second, that is 80 times 1,000 divided by 3,600, which is about 22.22 m/s. The pace is 3 hours, which is 180 minutes, divided by 240 km, which is 0.75 minutes per km, or 45 seconds per km. Enter 240 and 3 in the calculator and check your result. Now try a slower journey — 240 km in 4 hours gives 60 km/h — and see how much longer the same distance takes.
Three formulas cover everything: speed = distance divided by time; distance = speed times time; time = distance divided by speed. For example, if you drive at 60 km/h for 2.5 hours, the distance is 60 times 2.5, which is 150 km. If you need to travel 300 km at 75 km/h, the time is 300 divided by 75, which is 4 hours. To convert km/h to m/s, multiply by 1,000 and divide by 3,600, which is the same as dividing by 3.6. To convert m/s to km/h, multiply by 3.6.
Convert minutes to hours first. 30 minutes is 0.5 hours, 45 minutes is 0.75 hours and 90 minutes is 1.5 hours. Use the same units. If the distance is in kilometres, the time must be in hours for km/h; mixing metres and kilometres gives a wrong answer. Check your pace for running. Runners usually talk about minutes per kilometre, which this calculator shows too. Remember average speed. This calculator gives average speed; your real speed goes up and down during the journey. Use it to plan journeys. Divide the distance by your expected speed to find how long a trip will take.
Entering minutes as hours. Entering 30 instead of 0.5 for 30 minutes makes the speed 60 times too small. Mixing kilometres and metres. 10,000 metres is 10 km; enter the distance in kilometres only. Forgetting stops. A journey with a 30-minute stop takes longer than the driving time alone, so add stops to your time. Confusing speed and pace. Speed is distance per time (km/h), while pace is time per distance (min/km) — they are opposites. Trusting the speedometer too much. Car speedometers can read a few km/h high, so your real speed may be slightly lower.
Pro Tip: To convert km/h to m/s quickly, just divide by 3.6. So 72 km/h is 20 m/s, and 36 km/h is 10 m/s — handy for science and sport.
Note: This calculator gives average speed over the whole journey. Your speed at any single moment may be higher or lower than the average.
How do I calculate speed? Speed = distance divided by time. For example, 10 km in 0.5 hours is 20 km/h. This calculator does the maths for you.
How do I convert km/h to m/s? Divide km/h by 3.6. For example, 72 km/h is 20 m/s. To convert m/s to km/h, multiply by 3.6.
What is pace in running? Pace is the time per kilometre, usually shown as minutes per km. A pace of 6 min/km means it takes 6 minutes to run one kilometre, which is 10 km/h.
How do I find the time for a journey? Time = distance divided by speed. For example, 300 km at 75 km/h takes 300 divided by 75, which is 4 hours.
How do I find distance from speed and time? Distance = speed times time. For example, driving at 60 km/h for 2.5 hours covers 150 km.
What is average speed? Average speed is the total distance divided by the total time, including any stops and slow sections. It is usually lower than your top speed.
Can I use this calculator for walking? Yes. A normal walking speed is about 5 km/h, which is about 12 minutes per kilometre. Enter your distance and time to check your own walking speed.
Why is my speed different from my car's speedometer? Car speedometers often read a few km/h higher than the real speed, by design. GPS speed is usually more accurate.
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