Speed, Time and Distance Calculator
＋More features: arrival time, departure time, metres per minute and per second
What time will I arrive?
Calculates the expected arrival time from the departure time, distance and average speed, including break time.
What time should I leave? Working backwards
Works backwards from the time you want to arrive to the time you should leave (distance, speed and breaks are taken from the fields above).
Convert km/h to metres per minute and per second
The “km/h to m/min and m/s” conversion often needed for science homework.
Enter two of speed, distance and time, and the third one appears straight away. It answers questions such as “how many hours is 150 km at 80 km/h?” using the basic relationship taught at school. Useful for checking homework or planning a drive.
How to use
- Enter the two values you know (any two of speed, distance and time).
- Leave the remaining one blank.
- The moment you enter the second value, all three values appear below — no button needed.
How it is calculated
- Distance = speed × time / Speed = distance ÷ time / Time = distance ÷ speed
- Example: 150 km at 80 km/h → 150 ÷ 80 = 1.875 hours = about 1 hour 53 minutes
- Time is always entered in minutes (1 hour 30 minutes = 90 minutes).
Sources and assumptions
- This is arithmetic based on the definition of speed (distance ÷ time).
Assumptions and notes
- On a real journey there are traffic lights, breaks and congestion, so you will not arrive in exactly the calculated time. When planning a drive it is realistic to assume a conservative average speed (roughly 80 km/h on expressways and 30 km/h on ordinary roads).
Frequently asked questions
What is the “hajiki” circle?
It is the way the relationship is memorised in Japanese schools, using a circle divided into speed (は, hayasa), time (じ, jikan) and distance (き, kyori). If you remember the single formula distance = speed × time, division gives you the other two.
How do I convert to metres per minute or per second?
Divide the speed in km/h by 60 for kilometres per minute and by 3600 for kilometres per second. So 60 km/h is 1 km per minute, or about 16.7 metres per second.
Can it calculate a running pace (minutes per km)?
This tool is built around speed in km/h. To get a pace from it, divide 60 by the speed in km/h: at 12 km/h the pace is 60 ÷ 12 = 5 minutes per km.