Average Speed Calculator
Calculate average speed from distance and time. Convert between mph, km/h, m/s, and knots. Get pace calculations for running, cycling, and driving.
Average Speed Calculator
Calculator
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Formula: Average Speed = Total Distance / Total Time
Worked example — Average Speed: 60 mph (96.56 km/h | 26.82 m/s)
Formula
Average Speed = Total Distance / Total Time
Where Total Distance is measured in miles or kilometers, and Total Time includes all time spent traveling including stops. Speed can be expressed in mph, km/h, m/s, or knots.
Worked Examples
Example 1: Road Trip Average Speed
Problem:You drive 150 miles in 2 hours and 30 minutes. What is your average speed?
Solution:Total time = 2 hours + 30/60 hours = 2.5 hours Average speed = 150 miles / 2.5 hours = 60 mph Converted: 60 x 1.60934 = 96.56 km/h In m/s: 60 x 0.44704 = 26.82 m/s Pace: 2.5 hours / 150 miles = 1 min per mile
Result:Average Speed: 60 mph (96.56 km/h | 26.82 m/s)
Example 2: Marathon Runner Pace
Problem:A runner completes a marathon (42.195 km) in 3 hours and 45 minutes. What is the average speed?
Solution:Total time = 3 + 45/60 = 3.75 hours Average speed = 42.195 km / 3.75 hours = 11.25 km/h Converted to mph: 11.25 / 1.60934 = 6.99 mph Pace: 3.75 x 60 / 42.195 = 5:20 per km Pace per mile: 8:35 per mile
Result:Average Speed: 11.25 km/h (6.99 mph) | Pace: 5:20/km
Frequently Asked Questions
How do you calculate average speed?
Average speed is calculated by dividing the total distance traveled by the total time taken to travel that distance. The formula is straightforward: Average Speed equals Total Distance divided by Total Time. For example, if you drive 150 miles in 2 hours and 30 minutes (2.5 hours), your average speed is 150 divided by 2.5, which equals 60 mph. It is important to note that average speed is different from instantaneous speed, which is your speed at any given moment. Average speed smooths out all the accelerations, decelerations, stops, and speed variations over the entire journey into a single representative value. The units depend on your distance and time units.
What is the difference between average speed and average velocity?
Average speed and average velocity are related but distinct concepts in physics. Average speed is a scalar quantity that measures total distance traveled divided by total time, regardless of direction. Average velocity is a vector quantity that measures displacement (straight-line distance from start to finish) divided by total time. For example, if you drive 100 miles north then 100 miles south in 4 hours total, your average speed is 200 miles divided by 4 hours equals 50 mph. However, your average velocity is zero because your displacement is zero since you returned to your starting point. Average speed is always positive and always greater than or equal to the magnitude of average velocity.
How do you convert between mph, km/h, and m/s?
Converting between speed units requires knowing the conversion factors between distance units. To convert miles per hour to kilometers per hour, multiply by 1.60934. To convert km/h to mph, divide by 1.60934. To convert km/h to meters per second, divide by 3.6 (since 1 km equals 1000 meters and 1 hour equals 3600 seconds). To convert mph to meters per second, multiply by 0.44704. For nautical applications, 1 knot equals 1.852 km/h or 1.15078 mph. A useful quick approximation is that 100 km/h is roughly 62 mph, and 60 mph is roughly 97 km/h. For running and cycling, pace is often expressed as minutes per mile or minutes per kilometer rather than speed units.
How does average speed apply to multi-segment trips?
For multi-segment trips, average speed must be calculated using total distance divided by total time, not by averaging the speeds of individual segments. This is a common mistake that leads to incorrect results. For example, if you drive 60 miles at 60 mph (1 hour) and then 60 miles at 30 mph (2 hours), the average speed is 120 miles divided by 3 hours, which equals 40 mph, not the arithmetic mean of 45 mph. The reason is that you spend more time at the slower speed, which pulls the average down. This concept is known as the harmonic mean and is the correct way to average rates. The formula for two equal-distance segments is: Average Speed equals 2 times Speed1 times Speed2 divided by the sum of Speed1 plus Speed2.
What are typical average speeds for different modes of transportation?
Average speeds vary widely by transportation mode and conditions. Walking speed averages 3 to 4 mph or about 5 to 6 km/h. Recreational cycling averages 10 to 15 mph while professional cyclists sustain 25 to 30 mph. City driving typically averages 20 to 35 mph due to traffic lights and congestion, while highway driving averages 55 to 75 mph depending on the road and traffic. Passenger trains average 50 to 80 mph for conventional rail and 150 to 220 mph for high-speed rail systems. Commercial aircraft cruise at approximately 550 mph or 885 km/h. Container ships travel at 12 to 16 knots, roughly 14 to 18 mph. These averages include stops, acceleration, and deceleration, so actual cruising speeds are typically higher than the stated averages.
Why do odometer distance and GPS distance disagree, and how does that change the average speed?
An odometer counts wheel revolutions and multiplies by the rolling circumference of the tyre, so worn tread, low pressure or a non-standard tyre size biases the total by a percent or two. A GPS track instead sums straight-line chords between fixed positions, which shortens winding roads when the sampling interval is long and adds drift while stationary. Because average speed is distance divided by time, a two percent distance error moves the speed figure by the same two percent, so use one distance source consistently.
How do you convert an average speed into a running pace?
Pace is the reciprocal of speed, expressed as time per unit distance instead of distance per unit time. Divide 60 by your speed in mph to get minutes per mile, or 60 by your speed in km/h to get minutes per kilometre. A 10 km/h pace is 60/10 = 6.00 minutes per km, which is 6 minutes 0 seconds. Convert the decimal remainder to seconds by multiplying by 60: a pace of 7.25 min/mile is 7 minutes 15 seconds. Runners and cyclists prefer pace because it maps directly onto split times at each marker.
What does a stop or traffic delay do to the average speed figure?
Because average speed uses total elapsed time, every idle minute is counted as distance-free time and drags the figure down. If you cover 60 miles of driving at a steady 60 mph but sit for 20 minutes in traffic, the elapsed time becomes 1.333 hours and the average speed falls to 60 / 1.333 = 45 mph. This is why highway cruising speed and trip average speed differ so much, and why journey planners quote an effective average that already builds in expected stops, fuel breaks and congestion.
When should you use m/s instead of mph or km/h?
Metres per second is the SI coherent unit and is required whenever a speed feeds into a physics formula that uses SI units — kinetic energy, momentum, drag, stopping distance or projectile motion — because mixing mph into those equations breaks dimensional consistency. Convert km/h to m/s by dividing by 3.6, and mph to m/s by multiplying by 0.44704. Everyday road and travel contexts keep mph or km/h because those match speed limits and odometers, while knots persists in marine and aviation use where 1 knot is one nautical mile per hour, or 1.852 km/h.
How can average speed be used to estimate arrival time on a planned route?
Rearranging the formula gives Time = Distance / Average Speed, so a realistic average speed turns a route length into an estimated duration. For a 260 mile drive at a realistic 55 mph trip average, the estimate is 260 / 55 = 4.73 hours, or about 4 hours 44 minutes. Use a trip average that already includes stops rather than the posted speed limit, and split long routes into segments with different averages — urban, rural, motorway — then sum the segment times for a more reliable arrival estimate.
References
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer · Editorial policy
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