Calculate speed, distance, or time quickly using our free Speed Distance Time Calculator. Enter any two known values, choose your units, and get the answer in your preferred unit. The calculator also shows the step-by-step calculation, including any unit conversions used.
Speed, Distance & Time Calculator
Calculate speed, distance, or time using any two known values.
Calculation Steps
Whether you want to find distance from speed and time, calculate speed from distance and time, or find the time required to travel a given distance, this calculator can help.
Speed, Distance & Time Formula
The Speed, distance, and time are related using three basic formulas:
Speed = Distance ÷ Time
Distance = Speed × Time
Time = Distance ÷ Speed
You can rearrange these formulas depending on which value you want to calculate.
For example, if a vehicle travels at 60 km/h for 3 hours:
Distance = 60 × 3 = 180 km
So, the vehicle travels 180 kilometres.
How to Use the Speed Distance Time Calculator
Using the calculator is simple:
- Select what you want to calculate: distance, speed, or time.
- Enter the two values you already know.
- Select the appropriate unit for each value.
- Select the unit in which you want your answer.
- Click Calculate.
- The calculator will show the answer along with the calculation steps.
You can use different combinations of units, including kilometres, metres, miles, feet, yards, km/h, mph, m/s, ft/s, knots, seconds, minutes, hours, and days.
Distance Calculator From Speed and Time
To calculate distance when speed and time are known, use:
Distance = Speed × Time
For example, suppose you travel at 50 miles per hour for 2 days.
First convert the time into hours:
2 days × 24 = 48 hours
Now calculate the distance:
50 miles/hour × 48 hours = 2,400 miles
Therefore, the distance is 2,400 miles.
The important point is that you don’t always need to convert everything to kilometres. If your speed is already given in miles per hour and you want the answer in miles, you can simply convert the time to hours and multiply.
Time Calculator From Speed and Distance
When distance and speed are known, you can calculate the time using:
Time = Distance ÷ Speed
For example, if you need to travel 300 km at a speed of 60 km/h:
Time = 300 ÷ 60
Time = 5 hours
Therefore, it will take 5 hours to travel 300 km at 60 km/h, assuming the speed remains constant.
You can also convert the result into minutes, seconds, or days using the calculator.
Calculate Speed With Distance and Time
To calculate speed when distance and time are known:
Speed = Distance ÷ Time
For example, if you travel 150 km in 3 hours:
Speed = 150 ÷ 3
Speed = 50 km/h
So, the average speed is 50 km/h.
The calculator can provide the answer in different units such as:
- Kilometres per hour (km/h)
- Miles per hour (mph)
- Metres per second (m/s)
- Feet per second (ft/s)
- Knots
How to Calculate Rate of Speed
The rate of speed can be calculated by dividing the distance travelled by the time taken.
Speed = Distance ÷ Time
For example:
Distance = 240 km
Time = 4 hours
Speed = 240 ÷ 4 = 60 km/h
Therefore, the speed is 60 km/h.
When comparing different journeys, make sure the distance and time units are compatible before performing the calculation.
Understanding the Unit Conversions
Speed, distance, and time can be expressed using different units. The calculator handles the necessary conversions based on the units you select.
Kilometres and metres
1 kilometre = 1,000 metres
For example:
5 km = 5,000 m
Miles and kilometres
1 mile = 1.609344 kilometres
For example:
10 miles × 1.609344 = 16.09344 km
Hours, minutes and seconds
1 hour = 60 minutes
1 hour = 3,600 seconds
Therefore:
2 hours = 120 minutes = 7,200 seconds
Days and hours
1 day = 24 hours
For example:
3 days × 24 = 72 hours
The calculator uses the appropriate conversion only when it is required for the selected answer.
Worked Examples
Example 1: Find Distance
A car travels at 80 km/h for 2.5 hours.
Distance = Speed × Time
Distance = 80 × 2.5
D = 200 km
Answer: 200 km
Example 2: Find Speed
A person travels 10 km in 2 hours.
Speed = Distance ÷ Time
Speed = 10 ÷ 2
S = 5 km/h
Answer: 5 km/h
Example 3: Find Time
A vehicle needs to travel 360 km at 90 km/h.
Time = Distance ÷ Speed
Time = 360 ÷ 90
T = 4 hours
Answer: 4 hours
Example 4: Find Distance in Miles
A vehicle travels at 50 mph for 3 days.
First convert days to hours:
3 × 24 = 72 hours
Then:
Distance = 50 × 72
Distance = 3,600 miles
Answer: 3,600 miles
This example demonstrates why unnecessary conversions are not required when the original units are already compatible.
Speed, Distance and Time Triangle
A simple way to remember the three formulas is:
Distance = Speed × Time
Speed = Distance ÷ Time
Time = Distance ÷ Speed
If you know any two of the three values, you can calculate the third.
Common Uses of a Speed Distance Time Calculator
This calculator can be useful for many everyday and educational calculations, including:
- Calculating travel distance
- Finding average travel speed
- Calculating journey time
- Vehicle and transportation calculations
- Running and cycling calculations
- Converting travel times
- Solving speed, distance and time maths problems
- Checking homework calculations
- Comparing travel speeds
- Calculating distance from speed and duration
Frequently Asked Questions
The three basic formulas are:
Speed = Distance ÷ Time
Distance = Speed × Time
Time = Distance ÷ Speed
Use the formula that corresponds to the value you want to find.
Multiply speed by time:
Distance = Speed × Time
For example, travelling at 60 km/h for 4 hours gives:
60 × 4 = 240 km
Divide the distance travelled by the time taken:
Speed = Distance ÷ Time
For example, 200 km travelled in 4 hours gives:
200 ÷ 4 = 50 km/h
Divide distance by speed:
Time = Distance ÷ Speed
For example:
300 km ÷ 60 km/h = 5 hours
First convert days into hours because mph means miles per hour.
For example:
2 days × 24 = 48 hours
If the speed is 50 mph:
50 × 48 = 2,400 miles
Yes. The calculator allows you to select the required speed unit, including km/h, mph, m/s, ft/s, and knots.
Yes. You can select the desired distance unit, including kilometres, metres, miles, feet, and yards.
Yes. You can choose days, hours, minutes, or seconds as the required time unit.
Speed describes how quickly something moves, while distance describes how far it travels.
For example, a car travelling at 60 km/h has a speed of 60 km/h. If it travels for 2 hours, the distance travelled is 120 km.
Final Takeaway
Speed, distance, and time are connected by three simple formulas:
Distance = Speed × Time
Speed = Distance ÷ Time
Time = Distance ÷ Speed
When different units are used, convert them into compatible units before calculating. Our calculator handles these conversions and provides the complete calculation steps, so you can see not only the final answer but also how the answer was obtained.