What is the speed-distance-time formula?

The fundamental relationship is: distance = speed x time. Rearranged: speed = distance / time, and time = distance / speed.

What 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.

What 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).

How 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.

Does this calculator handle acceleration?

No, this calculator assumes constant (average) speed. For acceleration problems, use kinematic equations (e.g., d = v0·t + 1/2·a·t²).

SCIScience

Speed, Distance & Time

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

Solve for

Value A

Value B

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How It Works

Formula

d = s \cdot t

s = \frac{d}{t}

t = \frac{d}{s}

Where

$d$: Distance
$s$: Speed
$t$: 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.

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