Speed Calculator: Convert Distance and Time to Various Units | Free Online Tool

Convert any distance-time pair into speed in your preferred unit. Enter distance, time, choose units, and see the result instantly. The tool auto-converts between meters, kilometers, miles, feet, yards, inches, seconds, minutes and hours; 1 mile equals 1,609.344 m (NIST, 2019).

Enter the distance traveled

Enter the time taken

Choose the number of decimal places for the result

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How to use the tool

1 — Enter distance

  • Type the numeric value into Distance.
  • Select a unit: meters, kilometers, miles, feet, yards or inches.
  • Example A: 1 200 meters.
  • Example B: 2.5 miles.

2 — Enter time

  • Type the duration into Time.
  • Pick seconds, minutes or hours.
  • Example A: 5 minutes.
  • Example B: 10 minutes.

3 — Choose speed unit (optional)

  • Select m/s, km/h, mph or ft/s to match your need.
  • Leave unchanged to keep meters per second.

4 — Set decimal places (optional)

  • Enter 0–10 to round the output.
  • Higher numbers show more precision.

5 — Press “Calculate Speed”

  • The result appears below the form in the unit you chose.

Formulas used

  • Distance → meters: dm = value × unit-factor
  • Time → seconds: ts = value × unit-factor

Speed in meters per second:

$$v_{m/s}= rac{d_m}{t_s}$$

Conversions:

  • km/h = $$v_{m/s} × 3.6$$
  • mph = $$v_{m/s} × 2.23694$$
  • ft/s = $$v_{m/s} × 3.28084$$

Example A: 1 200 m in 5 min → km/h

  • Distance: 1 200 m = 1.2 km
  • Time: 5 min = 0.08333 h
  • Speed: $$ rac{1.2}{0.08333}=14.4 \text{km/h}$$

Example B: 2.5 mi in 10 min → mph

  • Distance: 2.5 mi = 4 023.36 m
  • Time: 10 min = 600 s
  • Speed: $$ rac{4 023.36}{600}=6.7056\,\text{m/s}$$ → $$6.7056×2.23694≈15.0 \text{mph}$$

Quick-Facts

  • 1 mile = 1 609.344 m (NIST, 2019).
  • 1 hour = 3 600 s (SI Brochure, 2019).
  • Usain Bolt’s peak speed: 12.42 m/s (IAAF Berlin 100 m Final, 2009).
  • Average adult walking speed: 1.4 m/s (Rose et al., 2015).
  • Typical U.S. interstate limit: 70 mph (FHWA Speed Limits, 2022).

FAQ

What does the speed calculator do?

The tool converts any distance–time pair into speed, handling unit changes automatically for fast, error-free results.

Which distance units can I enter?

You can input meters, kilometers, miles, feet, yards or inches—covering both metric and imperial systems (NIST, 2019).

How accurate are the conversions?

Factors follow SI and NIST standards, ensuring sub-millimetre precision for metric units and exact statutory factors for imperial (SI Brochure, 2019).

Can I adjust decimal places?

Yes. Enter 0–10; the calculator rounds with JavaScript’s ixed() method, so no hidden digits remain.

How do you convert m/s to mph?

Multiply by 2.23694: $$v_{mph}=v_{m/s}×2.23694$$ (NIST Handbook 44, 2020).

Why is speed different from velocity?

Speed shows magnitude only; velocity includes direction per ISO 80000-3 “Vector quantities” (ISO, 2019).

What is a typical human running speed?

Recreational runners average 3–4 m/s, far below Bolt’s 12.42 m/s world record (IAAF Berlin 2009).

How can athletes use this tool for pacing?

Enter target distance and desired time to find required speed, then match treadmill or track splits accordingly.

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