MasterTool

Speed Distance Time Calculator

Solve any one of speed, distance or time from the other two — trip time, average speed or distance covered.

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What this tool does

Solve any one of speed, distance or time from the other two — trip time, average speed or distance covered. Uses a single constant average speed. Real journeys vary; enter the average you actually expect, including stops, for planning.

How to use the Speed Distance Time Calculator

  1. Enter or select solve for.
  2. Enter or select distance (miles).
  3. Enter or select average speed (mph).
  4. Enter or select time (hours).
  5. Read the calculated result; change any measurement to compare alternatives.

Formula

distance = speed × time; speed = distance ÷ time; time = distance ÷ speed
solveFor
Solve for
distance
Distance (miles)
speed
Average speed (mph)
time
Time (hours)

Uses a single constant average speed. Real journeys vary; enter the average you actually expect, including stops, for planning.

Worked example

For speed distance time calculator, the following measurements illustrate the exact method: Solve for: time; Distance (miles): 120; Average speed (mph): 60; Time (hours): 2.

Inputs

  • Solve forTime
  • Distance (miles)120
  • Average speed (mph)60
  • Time (hours)2

Result

  • Travel time (hours)2
  • Travel time (hours)2
  • Travel time (minutes)120
  • Average speed (mph)60
  • Distance (miles)120

Results explained

Travel time (hours)
Travel time (hours) from the formula above. Uses a single constant average speed. Real journeys vary; enter the average you actually expect, including stops, for planning.
Travel time (hours)
Travel time (hours) from the formula above. Uses a single constant average speed. Real journeys vary; enter the average you actually expect, including stops, for planning.
Travel time (minutes)
Travel time (minutes) from the formula above. Uses a single constant average speed. Real journeys vary; enter the average you actually expect, including stops, for planning.
Average speed (mph)
Average speed (mph) from the formula above. Uses a single constant average speed. Real journeys vary; enter the average you actually expect, including stops, for planning.
Distance (miles)
Distance (miles) from the formula above. Uses a single constant average speed. Real journeys vary; enter the average you actually expect, including stops, for planning.

Frequently asked questions

Time = distance ÷ average speed. 120 miles at an average 60 mph takes 2 hours — use your realistic average including stops and slower sections, not the speed limit.

Average speed = total distance ÷ total time, including any stopped time if you want door-to-door pace. 120 miles in 2.5 hours with stops is a 48 mph average.

Acceleration, traffic, fuel stops and urban sections all drag the average down. On long highway trips a planning average 5–10 mph below your cruise speed is typical.

Yes — the relation v = d ÷ t is universal. Enter miles and hours the same way; for pace per mile use the running tools in Sports.

Choose 'Distance' in Solve for: distance = speed × time, e.g. 55 mph for 3 hours covers 165 miles.