Speed Distance Time Calculator
Find speed, distance, or time.
Input
Result
What is a Speed Distance Time Calculator?
A Speed Distance Time Calculator solves for any one of the three variables when you know the other two. It is based on the fundamental physics formula speed = distance ÷ time. Whether you are planning a road trip, studying physics, or calculating travel times, this tool gives you instant results in your chosen units.
How to calculate speed, distance, and time manually (the formula)
The triangle formula: Speed = Distance ÷ Time, Distance = Speed × Time, Time = Distance ÷ Speed. Cover the variable you want to find and the remaining two show the operation. Always keep units consistent — if speed is in km/h, use distance in km and time in hours.
Example calculation
You drive 240 km in 3 hours. Speed = 240 ÷ 3 = 80 km/h. If you continue at 80 km/h for another 2 hours: Distance = 80 × 2 = 160 km. To travel the full 400 km at 80 km/h: Time = 400 ÷ 80 = 5 hours.
Common mistakes
- Mixing units — Using km with minutes but speed in km/h gives wrong results. Convert time to hours first (e.g., 30 min = 0.5 h).
- Using the wrong formula — Confusing speed = distance × time with the correct speed = distance ÷ time. Always check which variable you are solving for.
- Forgetting to convert minutes — 30 minutes is 0.5 hours, not 0.3. Divide minutes by 60 to get hours.
- Not accounting for stops — For travel time calculations, remember to include stops for fuel, food, or rest breaks in your total time estimate.
Frequently asked questions
How do I calculate speed from distance and time?
Speed = Distance ÷ Time. If you travel 300 km in 3 hours, speed = 300 ÷ 3 = 100 km/h. Make sure your units match — use km with hours or meters with seconds.
What is the formula for speed distance time?
The core formula is: Speed = Distance ÷ Time. Rearranged: Distance = Speed × Time, and Time = Distance ÷ Speed. These three form the speed-distance-time triangle used in physics and everyday travel calculations.
How do I calculate distance from speed and time?
Distance = Speed × Time. If you drive at 80 km/h for 2.5 hours: distance = 80 × 2.5 = 200 km. Enter speed and time into the calculator to find distance instantly.
How do I calculate time from speed and distance?
Time = Distance ÷ Speed. For a 150 km trip at 60 km/h: time = 150 ÷ 60 = 2.5 hours (2 hours 30 minutes). Use the calculator to get time in hours, minutes, and seconds.
What units should I use for speed distance time calculations?
Any consistent units work. Common pairs: km/h with km and hours, mph with miles and hours, m/s with meters and seconds. Mixing units (e.g., km with minutes) requires conversion.
What is the speed of sound and light in these units?
Speed of sound in air is about 343 m/s (1,235 km/h) at sea level. Speed of light is about 300,000 km/s — far faster than any everyday speed this calculator handles.