Speed Distance Time Calculator

Calculate
Units
Your result will appear here.

Metric results use km, h, km/h. Imperial results use miles, h, mph.

Info

What this tool does

The Speed • Distance • Time calculator lets you solve for one value when the other two are known. Choose what you want to find (Speed, Distance, or Time), enter the known values, and the tool computes the result using unit-appropriate formulas.

Works with both Metric (km, h) and Imperial (miles, h). Use one system per calculation.

Calculator

How the calculator works

  1. Select what to calculate: Speed, Distance, or Time.
  2. Choose Metric or Imperial units.
  3. Enter the two known values in the visible fields.
  4. Press Calculate to get the result. Use Copy or Share if needed.
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Units

  • Metric: Distance in kilometers (km), Time in hours (h), Speed in km/h.
  • Imperial: Distance in miles, Time in hours, Speed in mph.
  • Stick to one system per calculation to avoid conversion errors.

Tip: Convert minutes to hours by dividing by 60. Example: 45 min = 0.75 h.

Formula

Core formulas

Speed

Speed = Distance ÷ Time

Examples: km ÷ h → km/h • miles ÷ h → mph

Distance

Distance = Speed × Time

Examples: (km/h) × h → km • (mph) × h → miles

Time

Time = Distance ÷ Speed

Examples: km ÷ (km/h) → h • miles ÷ (mph) → h

Table

Quick reference examples

Given
Find
Example Setup
Distance & Time
Speed
50 km in 1.25 h → 50 ÷ 1.25 = 40 km/h
Speed & Time
Distance
60 mph for 2.5 h → 60 × 2.5 = 150 miles
Distance & Speed
Time
18 km at 6 km/h → 18 ÷ 6 = 3 h

For minutes/seconds, convert to hours first (e.g., 90 min = 1.5 h).

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Helpful tips

  • Enter Time in hours (e.g., 30 min = 0.5 h, 45 min = 0.75 h).
  • For pace (min/km or min/mile), compute time then convert hours → minutes.
  • Round results sensibly (2 decimals often looks clean).
Warning

Common mistakes

  • Mixing systems (km with mph or miles with km/h).
  • Entering minutes as hours (e.g., “45” instead of “0.75”).
  • Using negative or zero values (all inputs must be positive).
Help

Frequently asked questions

How do I convert minutes to hours?

Divide by 60. Example: 90 min = 90 ÷ 60 = 1.5 h.

Can I use km and mph together?

No. Use consistent units: Metric (km/h) or Imperial (mph) within a single calculation.

How do I convert km/h to mph?

Multiply km/h by ~0.621371 to get mph. Multiply mph by ~1.60934 to get km/h.

What’s the difference between speed and pace?

Speed is distance per time (e.g., km/h). Pace is time per distance (e.g., min/km). They are reciprocals.

Gear

Good to know

This tool focuses on simple constant-rate motion. Real-world trips with stops, acceleration, or traffic require averaging, but the same formulas still apply to the total distance and total time.