The Speed Distance Time Calculator helps you solve motion problems using the fundamental relationship: Speed = Distance ÷ Time. Whether you're planning a road trip, solving physics homework, or calculating running pace, this calculator provides accurate results with step-by-step explanations and automatic unit conversions.
Travel Time: 150 km at 60 km/h
Remember: Speed = Distance/Time, Distance = Speed × Time, Time = Distance/Speed. These are the fundamental motion equations.
Choose whether you want to calculate Speed, Distance, or Time from the dropdown menu.
Input the two values you know (e.g., distance and time to calculate speed).
Select appropriate units for each value (km/h, mph, m/s for speed; km, miles, meters for distance).
View your result with step-by-step explanation and conversions to other units.
The three formulas are interconnected: Speed = Distance ÷ Time, Distance = Speed × Time, Time = Distance ÷ Speed. Given any two values, you can calculate the third.
Speed = Distance ÷ Time
Speed = Distance ÷ Time. Remember: whatever you're solving for, rearrange this formula.
When converting km/h to m/s, divide by 3.6. When converting m/s to km/h, multiply by 3.6.
1 mile ≈ 1.609 km. To convert mph to km/h, multiply by 1.609.
Average speed for the whole journey = Total distance ÷ Total time (not the average of individual speeds!).
For round trips at different speeds, use: Average speed = 2×v₁×v₂ ÷ (v₁+v₂).
Walking speed is typically 5 km/h, jogging 10 km/h, cycling 20 km/h, and driving 60-120 km/h.
Use the fundamental motion formula to calculate any variable when you know the other two. Perfect for travel planning, physics problems, sports timing, and everyday calculations.
The relationship between speed, distance, and time is: Speed = Distance ÷ Time. This can be rearranged to: Distance = Speed × Time, and Time = Distance ÷ Speed. These are the fundamental equations of motion used in physics.
To calculate speed, divide the distance traveled by the time taken: Speed = Distance ÷ Time. For example, if you travel 120 km in 2 hours, your speed is 120 ÷ 2 = 60 km/h. Speed tells you how fast you're moving.
To find distance, multiply speed by time: Distance = Speed × Time. If you drive at 80 km/h for 3 hours, you'll cover 80 × 3 = 240 km. This is useful for trip planning and fuel estimation.
To calculate travel time, divide distance by speed: Time = Distance ÷ Speed. A 300 km journey at 100 km/h takes 300 ÷ 100 = 3 hours. Add buffer time for stops and traffic in real-world planning.
Common 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. 1 knot = 1.852 km/h = 1.151 mph. Mach 1 ≈ 343 m/s ≈ 1,235 km/h.
Walking: 5 km/h. Running: 10-15 km/h. Cycling: 20-30 km/h. Car (city): 40-60 km/h. Car (highway): 100-130 km/h. Bullet train: 300 km/h. Commercial jet: 900 km/h. Speed of sound: 1,235 km/h.
Data sourced from trusted institutions
All formulas verified against official standards.