Speed, Distance & Time Calculator
Know any two — this finds the third, instantly
Speed = Distance ÷ Time. Enter any two values and get the third in km/h, m/s, mph, and every common unit at once — no formula-hunting needed.
Calculate now — free
Worked Examples
See exactly how the formula is applied, step by step, for each type of problem.
A cyclist covers 5 km in 15 minutes. Find their speed in km/h.
- Convert time to hours: 15 min ÷ 60 = 0.25 hr
- Apply the formula: Speed = Distance ÷ Time
- Speed = 5 km ÷ 0.25 hr
A train travels at 80 km/h for 2 hours 30 minutes. How far does it go?
- Convert time to hours: 2 hr 30 min = 2.5 hr
- Apply the formula: Distance = Speed × Time
- Distance = 80 km/h × 2.5 hr
A car needs to cover 150 km at an average speed of 60 km/h. How long will it take?
- Apply the formula: Time = Distance ÷ Speed
- Time = 150 km ÷ 60 km/h
- Time = 2.5 hr = 2 hr + (0.5 × 60) min
A sprinter runs 100 m in 10 seconds. Find their speed in km/h.
- Find speed in m/s: 100 m ÷ 10 s = 10 m/s
- Convert m/s to km/h: multiply by 18/5 (3.6)
- Speed = 10 × 3.6
Try any of these in the calculator above using the shortcut chips, or change the numbers to match your own question.
Average Speeds, For Reference
Useful ballpark figures for estimation questions and sanity-checking your answer.
| Moving at | km/h | m/s |
|---|---|---|
| Walking (average person) | 5 km/h | 1.4 m/s |
| Running (jogging pace) | 10 km/h | 2.8 m/s |
| Cycling (casual) | 16 km/h | 4.4 m/s |
| City traffic (car) | 40 km/h | 11.1 m/s |
| Highway driving (car) | 90 km/h | 25 m/s |
| Indian Railways express train | 80–130 km/h | 22–36 m/s |
| Commercial aircraft (cruise) | 900 km/h | 250 m/s |
| Speed of sound (sea level) | 1,235 km/h | 343 m/s |
Have exact values? Use the calculator above for a precise answer.
Free Speed, Distance & Time Calculator — Built for Physics Numericals
The relationship between speed, distance and time is one of the first formulas taught in physics and shows up constantly afterwards — in kinematics, motion graphs, relative velocity problems, and everyday word problems about trains, cars and journeys. The formula itself is simple: Speed = Distance ÷ Time. Rearranged, that also gives Distance = Speed × Time and Time = Distance ÷ Speed.
What trips students up isn't the formula — it's the units. A question might give distance in kilometres but ask for speed in m/s, or give time in minutes when the formula expects hours. This calculator handles that automatically: pick whichever units the question uses for the two values you know, and the answer comes back broken down into every common unit at once (m/s, km/h and mph for speed; metres, km and miles for distance; seconds, minutes and hours for time), so you don't have to do a separate unit conversion afterward.
Use the Find Speed tab when you know distance and time, Find Distance when you know speed and time, and Find Time when you know distance and speed. All three use the exact SI-based formulas expected in CBSE, TN Board, NEET and JEE physics numericals.
Need a related tool? Try the time converter or length converter for standalone unit conversions, or the Ohm's law calculator for electrical circuit problems. If you're stuck on the full word problem rather than just the calculation, StudyHelpAI's Physics solver can walk through it step by step.
← Back to all unit convertersSpeed, distance & time — common questions
Speed = Distance ÷ Time. Rearranged, Distance = Speed × Time, and Time = Distance ÷ Speed. All three forms come from the same relationship — enter any two known values above and the calculator finds the third.
Multiply the speed in km/h by 5/18 (approximately 0.2778) to get m/s. For example, 90 km/h × 5/18 = 25 m/s.
Multiply the speed in m/s by 18/5 (3.6) to get km/h. For example, 20 m/s × 3.6 = 72 km/h.
An average adult walking pace is roughly 5 km/h, or about 1.4 metres per second. This is a common estimation figure used in physics word problems.
Yes. Speed-distance-time is foundational to the kinematics and motion chapters covered in both JEE and NEET physics, and this calculator uses the standard SI-based formulas expected in those exams.
Yes — each field has its own unit dropdown, including miles, feet, mph, seconds and minutes, so you can mix metric and imperial units and still get an accurate answer.