CalcLibrary

Speed, Distance & Time Calculator

Calculate speed, distance, or time from two known values. Uses the fundamental formula: distance = speed x time.

km/h
h
Examples

d = 60 × 2.5 = 150 km

Distance
150 km

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Examples

How It Works

Formula

d=s⋅td = s \cdot t

s=dts = \frac{d}{t}

t=dst = \frac{d}{s}

Variables

dd

Distance

ss

Speed

tt

Time

Choose what to solve for: distance (from speed and time), speed (from distance and time), or time (from speed and distance). Enter the two known values and the calculator computes the third using d = s × t.

For motion at a constant (or average) speed the three quantities are linked by d = s·t. The calculator picks the rearranged form that matches your two knowns and outputs the missing one. The result inherits its units from the inputs — feeding km/h and hours yields kilometres; feeding m/s and seconds yields metres. Use the same time unit on both sides to avoid silent unit mistakes.

Frequently Asked Questions

01What is the speed-distance-time formula?
The fundamental relationship is: distance = speed x time. Rearranged: speed = distance / time, and time = distance / speed.
02What units should I use?
Use consistent units. If speed is in km/h and time is in hours, distance is in km. If speed is in m/s and time is in seconds, distance is in metres.
03What is the difference between speed and velocity?
Speed is a scalar (magnitude only), while velocity is a vector (magnitude and direction). This calculator works with speed (scalar quantities).
04How do I convert km/h to m/s?
Divide by 3.6. For example, 72 km/h = 72 / 3.6 = 20 m/s. To convert m/s to km/h, multiply by 3.6.
05Does this calculator handle acceleration?
No. This calculator assumes constant or average speed. For changing-speed motion, use a constant-acceleration or kinematics calculator.

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