Distance Calculator: Speed, Time, and Distance — The Complete Formula Guide

The relationship between distance, speed, and time is one of the most practical formulas you will ever use. It solves driving questions, running targets, travel planning, and dozens of other everyday problems. Once you know the triangle, you can find any one of the three values when you have the other two.

Our  handles all three forms instantly. This guide covers the formulas and works through real examples.

The distance-speed-time triangle

The three formulas come from one relationship:

Distance = Speed x Time

Rearranged:

• Speed = Distance / Time
• Time = Distance / Speed

A useful memory device: cover the variable you want to find with your thumb. The remaining two show the operation — if they are side by side, multiply. If one is above the other, divide.

Working in consistent units

The most common mistake is mixing units. Speed in miles per hour, time in minutes, gives distance in miles per minute — not miles. Always convert to the same unit before calculating.

Calculation	Speed unit	Time unit	Distance unit
Driving trip	mph	hours	miles
Running pace	min/mile	minutes	miles
Cycling	km/h	hours	km
Walking short trips	m/min	minutes	meters

Finding distance

Distance = Speed x Time

Example: road trip planning

You drive at an average of 65 mph for 3.5 hours. How far do you travel?

Distance = 65 x 3.5 = 227.5 miles

Example: running training

You run at 6 mph for 45 minutes. Convert time first: 45 min = 0.75 hours.

Distance = 6 x 0.75 = 4.5 miles

Finding speed

Speed = Distance / Time

Example: calculating average speed

You drove 180 miles in 2 hours 45 minutes. What was your average speed?

Convert time: 2h 45m = 2.75 hours

Speed = 180 / 2.75 = 65.5 mph

Example: running pace

You ran a 10K (6.21 miles) in 52 minutes. What was your pace per mile?

Speed = 6.21 / 52 = 0.1194 miles per minute

Pace = 1 / 0.1194 = 8.38 minutes per mile = 8:23 per mile

Finding time

Time = Distance / Speed

Example: estimated arrival

You need to drive 340 miles and expect to average 60 mph. How long will it take?

Time = 340 / 60 = 5.67 hours = 5 hours 40 minutes

Example: meeting a train

The station is 12 miles away. You can walk at 3.5 mph. How long until you arrive?

Time = 12 / 3.5 = 3.43 hours = 3 hours 26 minutes

Converting between speed units

From	To	Multiply by
mph	km/h	1.60934
km/h	mph	0.62137
mph	m/s	0.44704
knots	mph	1.15078
m/s	km/h	3.6

Relative speed: two objects moving

When two objects move toward each other, their closing speed is the sum of their speeds. When moving in the same direction, the closing speed is the difference.

Example: two cars on a highway

Car A travels at 65 mph north. Car B travels at 60 mph south, starting 500 miles away. When do they meet?

Closing speed = 65 + 60 = 125 mph

Time to meet = 500 / 125 = 4 hours

Example: overtaking

Car A travels at 55 mph. Car B starts 30 miles behind and travels at 70 mph. How long until B passes A?

Relative speed = 70 - 55 = 15 mph

Time = 30 / 15 = 2 hours

For quick calculations across any scenario, the  and  handle all three forms and unit conversions in one step.