Speed Distance Time Calculator

Enter values for any two of the three fields (speed, distance, time) and click Calculate. The calculator will determine the missing value using the formula: Distance = Speed x Time. Leave the field you want to calculate empty.

Speed supports miles per hour (mph), kilometers per hour (km/h), meters per second (m/s), and knots. Distance supports miles, kilometers, meters, and feet. Time can be entered in hours, minutes, or seconds.

The calculator internally converts all values to base units (meters per second for speed, meters for distance, and seconds for time), performs the calculation, then converts the result back to your chosen output unit. The formula and conversion steps are shown in the results.

Yes. Enter your expected average speed (for example 60 mph) and the total distance (for example 300 miles). Leave the time field empty and click Calculate. The result will show the travel time broken down into hours, minutes, and seconds.

The three formulas are: Speed = Distance / Time, Distance = Speed x Time, and Time = Distance / Speed. The calculator determines which formula to apply based on which field you leave empty. The formula used is displayed alongside the result.