Speed Distance Time Calculator

Calculate speed, distance, or time using our free online calculator. Perfect for travel planning, physics problems, and everyday calculations.

Features

• Calculate any of three values:
  • Speed (when given distance and time)
  • Distance (when given speed and time)
  • Time (when given speed and distance)
• Multiple units support:
  • Speed: mph, km/h, m/s
  • Distance: miles, kilometers, meters
  • Time: hours, minutes, seconds
• Real-time calculations
• Clear explanations
• Mobile-friendly interface
• No registration required

How to Use

1. Choose what you want to calculate:
   • Speed (mph, km/h, m/s)
   • Distance (miles, km, m)
   • Time (hours, minutes, seconds)
2. Enter the known values
3. Get instant results with explanation
4. Switch between units as needed

Understanding the Formula

Speed, distance, and time are all connected. If you know any two of them, you can figure out the third. It's basic physics, but it comes up constantly in real life—planning trips, figuring out when you'll arrive, calculating how fast you need to go.

The basic formula is simple: Speed equals Distance divided by Time. That's it. If you travel 100 miles in 2 hours, your speed is 100 ÷ 2 = 50 miles per hour. But you can rearrange this formula three ways depending on what you need to find.

To find speed, divide distance by time. You drove 240 miles and it took 4 hours? That's 240 ÷ 4 = 60 mph. You ran 5 kilometers in 30 minutes? First convert 30 minutes to 0.5 hours, then 5 ÷ 0.5 = 10 km/h. The formula works with any units as long as they're consistent—miles and hours give you mph, kilometers and hours give you km/h.

To find distance, multiply speed by time. If you're driving 65 mph for 3 hours, you'll cover 65 × 3 = 195 miles. If you walk at 4 km/h for 45 minutes, that's 0.75 hours, so 4 × 0.75 = 3 kilometers. This is useful for planning trips—knowing your average speed and how long you'll be traveling tells you how far you'll get.

To find time, divide distance by speed. If you need to travel 150 miles and you'll average 60 mph, it'll take 150 ÷ 60 = 2.5 hours, or 2 hours and 30 minutes. If you're cycling 20 kilometers at 15 km/h, that's 20 ÷ 15 = 1.33 hours, or about 1 hour and 20 minutes. This helps you figure out arrival times or plan your schedule.

Travel planning constantly uses these calculations. You're planning a road trip and want to know how long it'll take. Distance is 500 miles, you'll average 65 mph, so time is 500 ÷ 65 = about 7.7 hours. Add stops and you know when you'll arrive. Or you have a deadline—need to be there in 6 hours, distance is 400 miles. Speed needed is 400 ÷ 6 = about 67 mph. Simple but essential.

Physics problems involve these calculations constantly. Velocity problems, kinematics, motion—they all use speed, distance, and time. A car accelerating from rest, a ball thrown upward, a runner on a track—all involve these relationships. Understanding the formula helps solve physics homework and understand how things move.

Running and fitness tracking uses these calculations. You ran 5 miles in 40 minutes. Your average speed is 5 ÷ (40/60) = 5 ÷ 0.667 = 7.5 mph. Or you want to run 10 kilometers and know your pace is 5 minutes per kilometer. That's 0.083 hours per kilometer, so time is 10 × 0.083 = 0.83 hours, or 50 minutes. Tracking pace and distance helps with training.

Cycling involves constant speed-distance-time calculations. Planning a route, estimating arrival time, calculating average speed—all use these formulas. A 50-kilometer ride at 20 km/h takes 2.5 hours. Or you have 2 hours and want to ride 40 kilometers. Average speed needed is 40 ÷ 2 = 20 km/h. Understanding these relationships helps with training and route planning.

Transportation and logistics rely heavily on these calculations. Delivery drivers need to estimate arrival times. Fleet managers calculate how many deliveries can be made in a day. Public transportation schedules depend on distance and average speeds. Understanding speed, distance, and time helps optimize routes and schedules.

Navigation and GPS systems use these calculations behind the scenes. When your GPS tells you arrival time, it's calculating distance and average speed. When it suggests a route, it's comparing times based on speeds and distances. Understanding these calculations helps you interpret GPS information better.

Sports and athletics constantly involve these relationships. Track and field events measure speed over distances. Swimming competitions calculate times over set distances. Understanding the relationships helps with training, pacing, and performance analysis. If you want to run a marathon in 4 hours, you need to average about 6.55 mph or 10.55 km/h.

Everyday situations use these calculations more than you'd think. Walking to a store, biking to work, driving somewhere—you're constantly estimating times based on distance and speed. Rough mental calculations help you plan your day. Having a calculator that does it accurately helps when you need precise numbers.

The key is keeping units consistent. If you're using miles and hours, speed is in mph. If you're using kilometers and hours, speed is in km/h. If you mix units, you get wrong answers. Converting between units can be tricky, but this calculator handles that for you.

This calculator makes it easy. Just enter two values—speed and time, distance and time, or speed and distance—and it calculates the missing one. Switch between units easily. Get instant, accurate results without doing the math manually. Whether you're planning a trip, solving physics problems, or just curious about calculations, this tool handles it for you.

Common Applications

Travel Planning

• Calculate arrival times
• Plan journey distances
• Determine required speeds
• Estimate travel duration

Education

• Physics problems
• Math exercises
• Science experiments
• Distance learning

Transportation

• Route planning
• Delivery scheduling
• Fuel consumption
• ETA calculations

Why Use Our Calculator

• Instant calculations
• Multiple units
• Clear explanations
• User-friendly interface
• Works offline
• Free to use