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Mastering Speed Calculations

Physics, Travel, and Motion Explained

Speed is a fundamental concept in physics that describes how fast an object is moving. Whether you're a student solving kinematics problems or a driver planning a road trip, understanding the relationship between Speed, Distance, and Time is essential. Our tool helps you visualize this relationship instantly.

Calculate Speed

Use when you know how far you went and how long it took.

S = D ÷ T
Calculate Distance

Use when you know your speed and travel time.

D = S × T
Calculate Time

Use when you know the distance and your speed.

T = D ÷ S

Real World Speeds

Commercial Jet
~900 km/h
Usain Bolt
~44.72 km/h
Sound (Air)
1,235 km/h
Walking
~5 km/h

Frequently Asked Questions

How do you calculate speed?

Speed is calculated by dividing the total distance traveled by the time it took. The formula is Speed = Distance ÷ Time (S = D/T).

What is the difference between speed and velocity?

Speed is a scalar quantity, meaning it only has magnitude (e.g., 50 km/h). Velocity is a vector quantity, meaning it has both magnitude and direction (e.g., 50 km/h North).

How do I convert km/h to m/s?

To convert kilometers per hour (km/h) to meters per second (m/s), divide the value by 3.6. For example, 36 km/h ÷ 3.6 = 10 m/s.

What is average speed?

Average speed is the total distance traveled divided by the total time elapsed. It ignores stops or changes in speed during the journey. Formula: Average Speed = Total Distance / Total Time.

How fast is 1 knot?

One knot is equal to one nautical mile per hour. It is approximately 1.852 km/h or 1.15 mph. Knots are primarily used in maritime and aviation navigation.

What is the speed of sound?

The speed of sound in dry air at 20°C (68°F) is approximately 343 meters per second (m/s), which is about 1,235 km/h or 767 mph.

What is the speed of light?

The speed of light in a vacuum is exactly 299,792,458 meters per second (approx 300,000 km/s). Nothing in the universe can travel faster than this.

How do I calculate time if I know speed and distance?

To find time, divide the distance by the speed. Formula: Time = Distance ÷ Speed (T = D/S).

How do I calculate distance if I know speed and time?

To find distance, multiply the speed by the time. Formula: Distance = Speed × Time (D = S × T).

What is Mach speed?

Mach number is the ratio of an object's speed to the speed of sound. Mach 1 equals the speed of sound. Mach 2 is twice the speed of sound.