Speed Calculator - Calculate Speed, Distance, Time Online

Free online speed calculator. Calculate speed from distance and time, find distance traveled, or determine travel time. Supports multiple units with instant results.

9 min read

Speed Calculator

Free online speed calculator. Calculate speed from distance and time, find distance traveled, or determine travel time. Supports multiple units with instant results.

iAbout This Calculator

The Speed Calculator is an essential physics tool that helps you solve problems involving motion. Using the fundamental relationship between speed, distance, and time (Speed = Distance / Time), this calculator can find any one of these values when you know the other two. Whether you're planning a road trip, analyzing athletic performance, solving physics homework, or calculating delivery times, this versatile tool provides accurate results instantly. The calculator supports various unit combinations and handles real-world scenarios from walking speeds to airplane velocities, making it invaluable for students, travelers, athletes, and professionals who work with motion calculations.

?How to Use

1
Select what you want to calculate from the dropdown: Speed, Distance, or Time. Each option shows the appropriate input fields.
2
For Speed calculation: Enter the distance traveled and the time taken. The calculator will divide distance by time to find speed.
3
For Distance calculation: Enter the speed and the duration of travel. The calculator will multiply speed by time to find distance.
4
For Time calculation: Enter the distance and the speed. The calculator will divide distance by speed to find time.
5
Click Calculate to see your results instantly with the formula used shown below.

fFormula

v = \frac{d}{t}

The fundamental motion equations are: Speed = Distance / Time, Distance = Speed x Time, Time = Distance / Speed. These formulas assume constant speed (uniform motion). For example, if you travel 100 miles in 2 hours, your average speed is 100/2 = 50 mph.

v: Speed or velocity (units per time)
d: Distance traveled (length units)
t: Time elapsed (time units)

Examples

Road Trip Speed Calculation

Inputs: distance: 240, time: 4

60 mph

Speed = Distance / Time = 240 miles / 4 hours = 60 mph average speed

Marathon Distance

Inputs: speed: 10, time: 4.2

42 km

Distance = Speed x Time = 10 km/h x 4.2 hours = 42 km (marathon distance)

Flight Duration

Inputs: distance: 2500, speed: 500

5 hours

Time = Distance / Speed = 2,500 miles / 500 mph = 5 hours flight time

Use Cases

Road Trip Planning

Calculate arrival times and plan rest stops by determining how long it will take to travel between destinations at various speeds.

Athletic Training

Track running or cycling performance by calculating average speeds during training sessions and races.

Physics Education

Solve kinematics problems for school and university, understanding the fundamental relationships between motion variables.

Delivery Logistics

Estimate delivery times and plan shipping routes by calculating travel durations for different transportation modes.

Aviation Planning

Determine flight times and fuel requirements by calculating aircraft speeds and distances between airports.

Frequently Asked Questions

What's the difference between speed and velocity?

Speed is a scalar quantity that measures how fast something moves regardless of direction. Velocity is a vector quantity that includes both speed and direction. For example, 60 mph is a speed, while 60 mph north is a velocity. This calculator works with speed (magnitude only).

How do I convert between mph and km/h?

To convert mph to km/h, multiply by 1.60934. To convert km/h to mph, multiply by 0.621371. For example, 60 mph equals approximately 96.6 km/h, and 100 km/h equals approximately 62.1 mph.

Can this calculator handle acceleration?

This calculator assumes constant speed (uniform motion). For calculations involving acceleration, you would need different formulas: v = u + at, s = ut + 0.5at^2, where u is initial velocity, v is final velocity, a is acceleration, and t is time.

How accurate is average speed for long trips?

Average speed provides a useful estimate but doesn't account for stops, traffic, or varying speeds during a journey. For more accurate trip planning, add 10-20% extra time for rest stops and potential delays.

How do I calculate pace instead of speed?

Pace is the inverse of speed, typically used in running (minutes per mile or km). To convert speed to pace: if speed is 6 mph, pace is 60/6 = 10 minutes per mile. For 10 km/h, pace is 60/10 = 6 minutes per kilometer.

Conclusion

The Speed Calculator simplifies motion calculations that are fundamental to physics and everyday life. Whether you're a student learning kinematics, an athlete tracking performance, or a traveler planning journeys, understanding the speed-distance-time relationship is invaluable. The formula Speed = Distance / Time, along with its rearrangements, allows you to solve countless practical problems. Bookmark this tool for quick access whenever you need to solve motion problems or plan travel times.