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About the Speed Distance Time Calculator
The speed distance time calculator solves for one missing value when you know the other two. It finds travel time from distance and speed, distance from speed and time, or speed from distance and time.
Pick what to solve for in the first box, and the matching input hides. Distance can be entered in miles, kilometers, meters or nautical miles. Speed can be entered in miles per hour, kilometers per hour, meters per second or knots. Time is entered in hours, minutes and seconds. The calculator converts units for you, so you can mix them freely.
Results include the answer plus useful conversions. Time results show decimal hours, total minutes and pace. Distance results show miles, kilometers and meters. Speed results show mph, km per hour, meters per second, knots and pace.
How to Use the Speed Distance Time Calculator
- Choose time, distance or speed in “Solve for”.
- Enter the two known values and pick their units.
- Read the answer and its conversions in the result panel.
Speed Distance Time Formula
Distance = Speed × Time
Time = Distance ÷ Speed
Units must match. Miles with miles per hour gives hours. Kilometers with kilometers per hour also gives hours. The triangle method helps you remember: write D at the top and S and T at the bottom, then cover the value you want to find.
How to Calculate Time From Speed and Distance
Divide the distance by the speed. The answer is in hours. Multiply the decimal part by 60 to get minutes.
250 ÷ 65 = 3.846 hours
0.846 × 60 = 50.8 minutes
Travel time: about 3 hours 51 minutes
How to Calculate Distance and Speed
Distance: multiply speed by time in hours. 15 mph for 2.5 hours = 37.5 miles.
Speed: divide distance by time in hours. 26.2 miles in 4 hours = 6.55 mph.
Pace: divide time by distance. 4 hours for 26.2 miles is about 9 minutes 10 seconds per mile.
Driving Time Chart
| Distance | At 30 mph | At 45 mph | At 55 mph | At 65 mph | At 75 mph |
|---|---|---|---|---|---|
| 10 miles | 20 min | 13 min | 11 min | 9 min | 8 min |
| 25 miles | 50 min | 33 min | 27 min | 23 min | 20 min |
| 50 miles | 1 h 40 min | 1 h 7 min | 55 min | 46 min | 40 min |
| 100 miles | 3 h 20 min | 2 h 13 min | 1 h 49 min | 1 h 32 min | 1 h 20 min |
| 150 miles | 5 h | 3 h 20 min | 2 h 44 min | 2 h 18 min | 2 h |
| 200 miles | 6 h 40 min | 4 h 27 min | 3 h 38 min | 3 h 5 min | 2 h 40 min |
| 250 miles | 8 h 20 min | 5 h 33 min | 4 h 33 min | 3 h 51 min | 3 h 20 min |
| 300 miles | 10 h | 6 h 40 min | 5 h 27 min | 4 h 37 min | 4 h |
| 400 miles | 13 h 20 min | 8 h 53 min | 7 h 16 min | 6 h 9 min | 5 h 20 min |
| 500 miles | 16 h 40 min | 11 h 7 min | 9 h 5 min | 7 h 42 min | 6 h 40 min |
| 750 miles | 1 day 1 h | 16 h 40 min | 13 h 38 min | 11 h 32 min | 10 h |
| 1000 miles | 1 day 9 h 20 min | 22 h 13 min | 18 h 11 min | 15 h 23 min | 13 h 20 min |
Driving time with no stops. Real trips run longer once you add traffic, fuel and rest breaks.
These are moving times only. Traffic, fuel and rest stops add time on real trips. The National Highway Traffic Safety Administration recommends regular breaks on long drives to avoid drowsy driving.
Speed and Distance Unit Conversions
| Unit | Equals |
|---|---|
| 1 mile per hour | 1.609344 km per hour, 0.44704 meters per second, 0.868976 knots |
| 1 km per hour | 0.621371 miles per hour, 0.277778 meters per second, 0.539957 knots |
| 1 meter per second | 3.6 km per hour, 2.236936 miles per hour |
| 1 knot | 1.852 km per hour, 1.150779 miles per hour |
| 1 mile | 1.609344 kilometers |
| 1 nautical mile | 1.852 kilometers, 1.150779 miles |
A knot is one nautical mile per hour. A nautical mile is exactly 1,852 meters. Ships and aircraft use knots.
How to Calculate Average Speed
Average speed is total distance divided by total time. It is not the average of the speeds. Driving 60 miles at 30 mph (2 hours) and 60 miles back at 60 mph (1 hour) covers 120 miles in 3 hours, so the average speed is 40 mph, not 45 mph.
Frequently Asked Questions
What is a speed distance time calculator?
A speed distance time calculator is a tool that finds speed, distance or travel time when the other two are known. It uses the formula distance = speed × time.
What is the formula for speed, distance and time?
Speed = distance ÷ time, distance = speed × time, and time = distance ÷ speed. The units of all three must match.
How do I calculate travel time from distance and speed?
Divide the distance by the speed to get hours, then multiply the decimal part by 60 for minutes. 200 miles at 60 mph takes 3.33 hours, or 3 hours 20 minutes.
How do I calculate distance from speed and time?
Multiply speed by time in hours. Driving at 55 mph for 3 hours 15 minutes (3.25 hours) covers 178.75 miles.
How do I calculate average speed?
Divide the total distance by the total time. Do not average the speeds of each part of the trip, because you spend more time at slower speeds.
How long does it take to drive 100 miles?
At 60 mph, 100 miles takes 1 hour 40 minutes. At 70 mph it takes about 1 hour 26 minutes, not counting stops.
How do I convert mph to km per hour?
Multiply miles per hour by 1.609344. For example, 60 mph is about 96.6 km per hour.