Quick answer
Distance = speed × time, and the calculator solves for whichever of the three is left blank. 60 units of speed for 2.5 time units covers 150 distance units.
Enter any two of speed, distance and time, leaving one blank. The calculator returns the missing value.
Related tools: Density Calculator: Solve mass, density or volume. Kinetic Energy Calculator: Kinetic energy and momentum of a moving mass. Charles's Law Calculator: V₁/T₁ = V₂/T₂ at constant pressure.
How to use the Speed Distance Time Calculator
- Optionally, enter distance (d) (m).
- Optionally, enter speed (v) (m/s).
- Optionally, enter time (t) (s).
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Distance (d) (optional) | A number, in m. Leave blank to solve for this value | — |
| Speed (v) (optional) | A number, in m/s. Leave blank to solve for this value | — |
| Time (t) (optional) | A number, in s. Leave blank to solve for this value | — |
Formula and method
Formula
d = v × t
IEEE-754 double precision; shown to at most 6 decimal places.
Fill in any two values and leave the third blank; the blank one is calculated. Use consistent units.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Speed (v) = 60; Time (t) = 2.5.
| Result | Value |
|---|---|
| Distance | 150 m |
Example 2
Inputs: Distance (d) = 150; Time (t) = 2.5.
| Result | Value |
|---|---|
| Speed | 60 m/s |
Example 3
Inputs: Distance (d) = 150; Speed (v) = 60.
| Result | Value |
|---|---|
| Time | 2.5 s |
The first line is the headline result (distance). IEEE-754 double precision; shown to at most 6 decimal places.
Three forms
d = v × t, v = d ÷ t and t = d ÷ v. At 60 km/h for 2.5 hours you travel 150 km. A 300 km trip at 75 km/h takes 4 hours.
Consistent units
The units must be consistent: km/h with hours gives km. Convert minutes to hours by dividing by 60. Exactly one field must be blank and dividing by zero is rejected.
How the result changes with speed
Holding every other input at the first worked example, this table changes only speed. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Speed | Distance |
|---|---|
| 30 | 75 m |
| 60 | 150 m |
| 120 | 300 m |
| 240 | 600 m |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Distance (d): entering "1" shows "Leave exactly one field blank and fill in the other two." beside that field and no result.
Choosing between the Speed Distance Time Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Density Calculator](/science/density-calculator/) | Mass | |
| [Kinetic Energy Calculator](/science/kinetic-energy-calculator/) | mass and speed | Kinetic energy |
| [Charles's Law Calculator](/science/charles-law/) | Final volume | |
| [Boyle's Law Calculator](/science/boyles-law/) | Final volume | |
| [Coulomb's Law Calculator](/science/coulombs-law-charge/) | charge 1, charge 2 and distance | Force |
Background: motion and mechanics
For constant acceleration the standard relations are v = u + at, s = ut + ½at², v² = u² + 2as and s = ½(u + v)t. Pick the equation that contains your three known quantities and the one you want. Use SI units (metres, seconds, kilograms, newtons, joules) throughout or the answer will be off by a factor.
These equations stop applying when acceleration changes during the motion, as with a rocket burning fuel; that needs calculus or numerical methods.
Assumptions and limitations
- Exactly one field must be left blank
- Division by zero is rejected
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for distance (d) to confirm this.
Frequently asked questions
How long does 120 miles take at 40 mph?
120 miles at 40 mph takes 120 ÷ 40 = 3 hours.
What is average speed?
Total distance divided by total time.
How do I convert m/s to km/h?
Multiply m/s by 3.6 to get km/h: 27.78 m/s is 100 km/h.
What does the Speed Distance Time Calculator calculate?
Solve distance, speed or time. It returns Distance.
What formula does the Speed Distance Time Calculator use?
d = v × t. Fill in any two values and leave the third blank; the blank one is calculated.
What do I need to enter in the speed Distance Time Calculator?
You enter . Optional: Distance (d) (m), Speed (v) (m/s) and Time (t) (s).
How is the result rounded or limited?
IEEE-754 double precision; shown to at most 6 decimal places. Exactly one field must be left blank.
What are the limits of this calculator?
Exactly one field must be left blank. Division by zero is rejected.
What is an example of a speed Distance Time result?
With speed (v) 60 and time (t) 2.5, the distance is 150 m.
Related calculators
- Density Calculator — Solve mass, density or volume.
- Kinetic Energy Calculator — Kinetic energy and momentum of a moving mass.
- Charles's Law Calculator — V₁/T₁ = V₂/T₂ at constant pressure.
- Boyle's Law Calculator — P₁V₁ = P₂V₂ at constant temperature.
- Coulomb's Law Calculator — Electrostatic force between two point charges.
- Time Dilation Calculator — Dilated time for a clock moving at relativistic speed.
Sources
- OpenStax, University Physics Volume 1 (Rice University): mechanics
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.