Speed, Distance & Time Calculator

How to use the speed, distance and time calculator

1. Choose the quantity you want to find. Time is selected first: enter distance and an appropriate average speed.
2. For average speed, enter the total distance and elapsed duration of the same interval. For distance, enter an average speed and duration.
3. Choose a duration format when time is an input: a decimal number with hours, minutes or seconds, or hours:minutes with optional seconds.
4. Read the one main answer. Change its unit when finding speed or distance, open the calculation details if useful, or copy the result.

What you can calculate

• Time from distance and average speed.
• Average speed from total travelled distance and elapsed duration.
• Distance from average speed and elapsed duration.
• Mixed metric and mile-based quantities, converted without rounding the intermediate values.
• Decimal duration or explicit hours:minutes:seconds input, a qualified answer and a copyable summary.

Everyday uses

• Estimating the time for a known distance at a user-chosen average speed.
• Checking average speed from a recorded journey, walk or bicycle ride.
• Finding how far an object travels in a given time at an entered average speed.

Understanding average speed and elapsed time

The three relationships are time = distance ÷ average speed, average speed = distance ÷ elapsed time, and distance = average speed × elapsed time. The units must describe compatible physical quantities; this calculator handles their conversion.

Average speed uses total travelled distance and the elapsed duration of the same interval. It is not a single speedometer reading or a speed limit. For several journey sections, use total distance divided by total elapsed time, not an unweighted average of their speeds.

Include stops in the duration when you want the average for the whole trip. Use moving-only duration only when you mean moving-only average speed. The calculator does not subtract stops or add a guessed allowance.

Decimal hours and clock-style duration mean different things: 1.5 hours is 1 hour 30 minutes, while 1.30 hours is 1 hour 18 minutes. In hours:minutes format, 1:30 means 1 hour 30 minutes. For 45 minutes, enter 45 with the minutes unit or 0:45 in clock-style format.

One international mile is exactly 1609.344 metres. One hour is exactly 3600 seconds and one minute is 60 seconds. Therefore 1 m/s equals exactly 3.6 km/h; input and answer units are converted from these definitions.

An input unit change keeps the number and changes how it is interpreted. An answer-unit change converts the answer without changing the inputs. The two duration formats retain separate drafts; they do not convert an old entry automatically.

Speed, distance and time examples

Time: 120 km at an average 80 km/h gives 1 hour 30 minutes. This is the numerical duration for the entered average, not a traffic forecast.

Average speed: 120 km over 90 minutes is 80 km/h. The same calculation can use 1.5 hours or 1:30 in hours:minutes format.

Distance: an average 60 mph over 1.5 hours gives 90 miles. Selecting kilometres changes only the answer unit.

Mixed units: 10 km at 10 m/s gives 1000 seconds, displayed as 16 minutes 40 seconds.

Short interval: 100 metres over 9.58 seconds gives about 10.44 m/s. The exact ratio is used before the two-decimal answer is shown.

What the calculator does not predict

It does not find roads or routes, measure distance, inspect traffic, suggest an average speed or predict a departure/arrival time. Enter values appropriate to your own interval.

Results are arithmetic, not a safe-speed, lawful-speed or physically possible-motion verdict. Acceleration, changing conditions, terrain and recommended breaks are not modelled.

The page uses travelled distance, not direction or displacement, and elapsed duration, not calendar dates or time zones. Zero distance can give zero average speed; zero duration cannot determine average speed, and zero speed cannot determine a unique travel time.

Your figures and privacy

The calculation runs locally in your browser. No route, traffic or calculator service receives your entries to produce an answer.

The page does not save your figures in a trip history or share URL. Copying happens only when you choose Copy result. The site's ordinary consent and privacy controls still apply.