Speed, Distance & Time Calculator

The Speed-Distance-Time Triangle

The relationship between speed, distance, and time forms the bedrock of classical kinematics. Known as the motion triangle, knowing any two variables allows you to compute the third:

$$\begin{aligned} \text{Speed } (v) &= \frac{d}{t} \ \text{Distance } (d) &= v \times t \ \text{Time } (t) &= \frac{d}{v} \end{aligned}$$

Speed Units Conversion Reference

Unit	Equivalent in km/h	Equivalent in mph	Equivalent in m/s
1 km/h	1.0000	0.6214	0.2778
1 mph	1.6093	1.0000	0.4470
1 m/s	3.6000	2.2369	1.0000
1 Knot (kn)	1.8520	1.1508	0.5144

Running & Cycling Pace Conversion

Athletes commonly measure performance in pace (time per unit distance) rather than speed (distance per unit time):

• Minutes per Kilometer: $\text{Pace } (\text{min/km}) = \frac{60}{\text{Speed } (\text{km/h})}$
• Minutes per Mile: $\text{Pace } (\text{min/mi}) = \frac{60}{\text{Speed } (\text{mph})}$

Example: A runner aiming for a sub-4 hour marathon must maintain an average speed of at least $10.55\text{ km/h}$ ($6.56\text{ mph}$), which corresponds to a steady pace of $5:41\text{ min/km}$ or $9:09\text{ min/mile}$.