How do I calculate pace for running?

Running pace is typically expressed as minutes per kilometre (min/km) or minutes per mile (min/mile). To find your pace, select 'Find Time', enter the distance (e.g. 1 km) and your speed (e.g. 10 km/h). Result: 6 minutes per km. Alternatively, pace = 60 ÷ speed(km/h) minutes per km.

What is a knot and how is it used?

A knot is a unit of speed equal to one nautical mile per hour (1.852 km/h or 1.151 mph). It is used in maritime and aviation navigation. This calculator supports knots as a speed unit, making it useful for sailors, pilots, and anyone working with nautical charts.

Speed Distance Time Calculator — Solve for Speed, Distance or Time

Q: What is the speed distance time formula?

The three formulas are: Speed = Distance ÷ Time, Distance = Speed × Time, and Time = Distance ÷ Speed. These are related by the simple triangle: cover the variable you want to find and apply the remaining operation. For example, to find time, cover T: D ÷ S = T.

Q: How do I convert km/h to mph?

To convert km/h to mph, multiply by 0.621371. For example, 100 km/h = 100 × 0.621371 = 62.14 mph. To convert mph to km/h, multiply by 1.60934. This calculator handles all conversions automatically — just select your preferred units.

Q: How do I calculate travel time for a road trip?

Select 'Find Time', enter your distance (e.g. 450 km) and average speed (e.g. 80 km/h). The calculator gives you time in hours, minutes, and seconds. Remember that this is pure travel time — add breaks, traffic, and fuel stops to get realistic trip duration.

Q: How do I calculate average speed?

Average speed = Total Distance ÷ Total Time. Select 'Find Speed', enter the total distance and total time taken. For a journey where speed varies (city driving, highways, stops), use total distance and total elapsed time to get the average speed for the trip.

Q: What is the difference between speed and velocity?

Speed is a scalar quantity — it has magnitude only (e.g. 60 km/h). Velocity is a vector quantity — it has both magnitude and direction (e.g. 60 km/h north). For everyday calculations like travel time and distance, speed is what matters. This calculator uses speed in the physics sense: magnitude of motion regardless of direction.

Q: How does this speed distance time calculator work?

Choose what you want to find (Speed, Distance, or Time) using the tabs at the top. Enter the other two values with their units. Click Calculate to get the result along with a full summary showing all three values. The calculator converts between all supported units automatically.

Solve For

Distance

Speed

Time

h m s

Result

All Values

Speed

Distance

Time

About This Calculator

What it calculates: Solves for speed, distance, or time given the other two values. Handles all unit conversions automatically.
Inputs required: Any two of: speed (with unit), distance (with unit), time (hours + minutes + seconds). Select the unknown you want to find.
Outputs: The solved value in the user's chosen unit, plus a full summary showing speed, distance, and time together.
Formula: Speed = Distance ÷ Time | Distance = Speed × Time | Time = Distance ÷ Speed
Supported units: Speed: km/h, mph, m/s, knots. Distance: km, miles, meters, feet. Time: hours, minutes, seconds.
Last updated: March 2026

How to Use This Calculator

Choose what to solve for: Click one of the three tabs — Speed, Distance, or Time — to select the unknown value you want to find.
Enter the two known values: The input fields for the two known values will appear. For speed and distance, select the unit from the dropdown next to each field. For time, enter hours, minutes, and seconds in separate fields (use only the fields you need — leave others at 0).
Click Calculate: The result appears instantly showing the solved value and a summary of all three quantities — making it easy to verify the answer makes sense.

Tips:

You can enter partial time values — e.g. 1 hour 30 minutes (no seconds needed). Leave empty fields as 0 or blank.
For pace-based sports, switch speed to m/s for shorter distances, or km/h for running and cycling.
For nautical calculations, select "knots" for speed and "miles" (nautical miles) for distance.
The calculator handles very small and very large values — from microsecond physics to multi-day journeys.

Speed Distance Time Formula

The relationship between speed, distance, and time is one of the most fundamental in physics and everyday life. The three formulas are:

Speed = Distance ÷ Time

Distance = Speed × Time

Time = Distance ÷ Speed

A simple memory aid is the SDT triangle: write S at the top, D on the bottom left, and T on the bottom right. Cover the variable you want to find:

Cover S: the remaining D and T are side by side, meaning D ÷ T
Cover D: S and T are side by side, meaning S × T
Cover T: D and S are stacked, meaning D ÷ S

Units must be consistent. If speed is in km/h, distance must be in km and time in hours. This calculator handles all conversions internally — you can mix any supported units freely and the correct result will be computed and displayed in your chosen output unit.

Average speed vs instantaneous speed: These formulas compute average speed — total distance divided by total time. Instantaneous speed (like a speedometer reading) requires calculus (derivatives). For most practical purposes — trip planning, race pace, logistics — average speed is what you need.

Unit Conversion Reference

This calculator supports all common speed and distance units. Here are the conversion factors used:

Speed Unit	To m/s	To km/h	To mph
1 km/h	0.2778 m/s	1 km/h	0.6214 mph
1 mph	0.4470 m/s	1.6093 km/h	1 mph
1 m/s	1 m/s	3.6 km/h	2.2369 mph
1 knot	0.5144 m/s	1.852 km/h	1.1508 mph

Distance Unit	In Meters
1 kilometre (km)	1,000 m
1 mile	1,609.344 m
1 meter (m)	1 m
1 foot (ft)	0.3048 m

Example Calculations

Example 1: Road trip — how long will it take?

Distance = 450 km | Average Speed = 90 km/h

Time = 450 ÷ 90 = 5 hours exactly

Add 30 minutes for fuel/breaks → realistic trip time: 5 hours 30 minutes.

Example 2: Running — how far can you go?

Speed = 10 km/h | Time = 45 minutes (0.75 hours)

Distance = 10 × 0.75 = 7.5 km

A 45-minute run at 10 km/h covers 7.5 km — useful for planning training routes.

Example 3: Cycling race — what was the average speed?

Distance = 160 km | Time = 4 hours 10 minutes

Time in hours = 4 + 10/60 = 4.1667 hours

Speed = 160 ÷ 4.1667 = 38.4 km/h

Example 4: Aviation — flight time at cruising speed

Distance = 550 nautical miles | Speed = 450 knots

Time = 550 ÷ 450 = 1.222 hours = 1 hour 13 minutes

Real-World Applications

The speed-distance-time relationship is used across dozens of contexts every day:

Road trips and navigation: Estimate arrival time based on distance and expected average speed. Account for different speed limits on city roads vs highways. This is exactly what GPS apps do behind the scenes.
Running and cycling training: Calculate pace (time per km), project race finish times, plan interval training distances. A runner doing 5 min/km = 12 km/h. A cyclist averaging 30 km/h for 2 hours covers 60 km.
Logistics and delivery: Fleet managers use speed and distance to schedule deliveries, estimate fuel consumption, and plan driver shift times. A truck averaging 60 km/h for 8 hours covers 480 km.
Aviation: Pilots calculate flight time using great-circle distance and cruising airspeed. Wind speed is added (tailwind) or subtracted (headwind) to get ground speed, then distance ÷ ground speed = flight time.
Maritime navigation: Ships and boats use speed in knots and distance in nautical miles. A vessel at 15 knots takes 550 ÷ 15 = 36.67 hours to travel 550 nautical miles.
Physics and science: Light travels at approximately 299,792 km/s (3 × 10⁸ m/s). Sound travels at 343 m/s at sea level. These constants are used to calculate distances in astronomy and acoustics.
School and exam problems: Speed-distance-time problems are standard in school mathematics curricula. This calculator verifies your working instantly.

Frequently Asked Questions

What is the speed distance time formula?

The three formulas: Speed = Distance ÷ Time; Distance = Speed × Time; Time = Distance ÷ Speed. Use the SDT triangle mnemonic — cover the variable you want to find and apply the remaining operation (multiply or divide).

How do I convert km/h to mph?

Multiply km/h by 0.621371 to get mph. To convert mph to km/h, multiply by 1.60934. For example: 100 km/h = 62.14 mph. This calculator handles all conversions automatically — select your units and the result is in your chosen unit.

How do I calculate travel time for a road trip?

Click "Time", enter your distance and average speed. The result gives pure driving time — add 15–30 minutes per 3–4 hours for breaks, plus buffer for traffic. Real trip time is typically 15–25% more than the calculated driving time.

How do I calculate average speed?

Click "Speed", enter total distance and total time taken. Average speed = total distance ÷ total time. Note: average speed is not the same as the average of your minimum and maximum speeds — it must be calculated from total distance and total elapsed time.

What is the difference between speed and velocity?

Speed is a scalar (magnitude only — e.g. 60 km/h). Velocity is a vector (magnitude + direction — e.g. 60 km/h north). For everyday travel calculations, speed is what you need. Velocity matters in physics when direction of motion changes (e.g. circular motion, vectors).

How do I calculate running pace?

Pace (min/km) = 60 ÷ speed (km/h). For example, 10 km/h = 6 min/km pace. To use this calculator, click "Time", set distance to 1 km, and enter your speed in km/h. The result in minutes is your pace per kilometre.

What is a knot?

A knot equals one nautical mile per hour (1.852 km/h or 1.151 mph). It is the standard speed unit in maritime and aviation. This calculator supports knots as a speed option, making it useful for sailors, pilots, and anyone working with nautical charts.

How does this speed distance time calculator work?

Select what to find (Speed, Distance, or Time), enter the two known values with their units, and click Calculate. All inputs are converted to SI units (metres and seconds) internally for precision, then the result is converted back to your chosen output unit.

Calculator Category

This tool belongs to Date & Time Calculators. Browse similar tools for related calculations.

Results are for informational purposes only. This calculator uses average speed calculations. Actual travel times depend on traffic, terrain, stops, weather, and other real-world factors.

Speed Distance Time Calculator