Speed Distance Time Calculator
Solve for speed, distance, or time given the other two values.
Distance equals speed multiplied by time.
Time equals distance divided by speed.
Solved value
60 mph
Speed = Distance ÷ Time
Formula used
Speed = Distance ÷ Time
120 mi ÷ 2 hr
Speed
60 mph
Distance
120 mi
Time
2 hr
Duration breakdown
2 hr 0 min 0 sec
Equivalent speed
96.5606 km/h · 60 mph · 26.8224 m/s
Pace
1:00 min/mi · 0:37 min/km
Speed Distance Time Formulas
Distance
Distance = Speed × Time
Speed
Speed = Distance ÷ Time
Time
Time = Distance ÷ Speed
Symbols
d = s × t
Average Speed
Average Speed = Total Distance ÷ Total Time
Pace
Pace = Time ÷ Distance
Variable and Unit Explanations
d
Distance traveled.
s
Speed or average speed.
t
Time taken.
Distance units
Units such as meters, kilometers, miles, feet, and yards.
Time units
Seconds, minutes, and hours measure duration.
Speed units
Speed combines distance and time, such as mph or km/h.
Pace
Time per distance, commonly used for running and walking.
Speed, Distance, and Time Relationship
Higher speed
Speed increases when the same distance is covered in less time.
More distance
Distance increases when speed or time increases.
Less time
Time decreases when speed increases for the same distance.
Connected values
All three values are connected by distance = speed × time.
Unit consistency
Units must be converted before calculating.
Formula triangle
Distance sits above speed × time: cover the unknown to choose the formula.
Worked Examples
Find speed
Problem: 120 miles in 2 hours
Formula: Speed = Distance ÷ Time
Substitution: 120 ÷ 2
Answer: 60 mph
Average speed is 60 miles per hour.
Find distance
Problem: 50 km/h for 3 hours
Formula: Distance = Speed × Time
Substitution: 50 × 3
Answer: 150 km
At a constant average speed, distance grows with time.
Find time
Problem: 100 km at 80 km/h
Formula: Time = Distance ÷ Speed
Substitution: 100 ÷ 80
Answer: 1.25 hours
1.25 hours is 1 hour 15 minutes.
Convert mph to km/h
Problem: 60 mph
Formula: mph × 1.60934
Substitution: 60 × 1.60934
Answer: 96.56 km/h
Useful when comparing road speeds.
Running pace
Problem: 6 miles in 48 minutes
Formula: Pace = Time ÷ Distance
Substitution: 48 ÷ 6
Answer: 8 min/mile
Pace is the inverse of speed.
Walking distance
Problem: 3 mph for 40 minutes
Formula: Distance = Speed × Time
Substitution: 3 × 0.6667
Answer: 2 miles
Convert minutes to hours first.
Average speed
Problem: 300 km in 5 hours
Formula: Average Speed = Total Distance ÷ Total Time
Substitution: 300 ÷ 5
Answer: 60 km/h
This includes the whole trip time.
Unit mismatch
Problem: 500 meters in 2 minutes
Formula: Convert before solving
Substitution: 500 m ÷ 120 s
Answer: 4.17 m/s
Minutes were converted to seconds.
Average Speed vs Instantaneous Speed
Average speed
Average speed is total distance divided by total time. This calculator primarily uses average speed for the whole journey.
Instantaneous speed
Instantaneous speed is speed at one moment. Real journeys may include stops, traffic, acceleration, or changing speed.
Unit Conversions and Real-World Use Cases
mph
Common in US and UK road contexts.
km/h
Common in many countries for road speeds.
m/s
Common in physics and science problems.
Pace
Common for running and walking as min/mile or min/km.
Conversion
Units should be converted before using the formula.
Realistic trips
For planning, use realistic average speed rather than speed limit alone.
Common Speed Distance Time Mistakes
Understanding Your Result
Speed
Distance traveled per unit of time.
Distance
Length traveled at the given speed and time.
Time
Duration required to cover the distance at the given speed.
Average speed
Overall rate across the full journey.
Pace
Time needed per mile or kilometer.
Converted equivalent
Same result shown in another unit.
Frequently Asked Questions
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