ΣCALCULATORWizard171+ Calculators

Speed Distance Time Calculator

Solve for speed, distance, or time, enter any two values and get the third instantly. Works for driving, running, cycling, and flying. Updated .

Solve for
Quick examples
🚗 300mi @ 65mph 🏃 Marathon pace ✈ NYC to LA 🚴 20mi bike ride
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Full Breakdown

Convert any speed or distance value between common units.

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Tap any row to load it into the calculator.

Common driving scenarios
ScenarioDistanceSpeedTime
🚗 Highway drive300 mi65 mph4h 36m
🚗 Day trip100 mi65 mph1h 32m
🛙 City commute10 mi30 mph20 min
📍 Cross-state500 mi65 mph7h 41m
🗺 Cross-country2,800 mi65 mph43h 4m
Running & cycling
ScenarioDistanceSpeedTime
🏃 5K (10 min/mi)3.1 mi6 mph31 min
🏃 Half marathon13.1 mi6 mph2h 11m
🏃 Full marathon26.2 mi6 mph4h 22m
🚴 Casual bike ride20 mi15 mph1h 20m
🚴 Century ride100 mi18 mph5h 33m
Aviation & other
ScenarioDistanceSpeedTime
✈ NYC to LA2,451 mi575 mph4h 16m
✈ NYC to London3,459 mi575 mph6h 1m
🛰 Space station orbit17,500 mi17,500 mph1h 0m
🚶 Brisk walk1 mi3 mph20 min
💡

Speed, Distance, and Time: The Physics Behind Everyday Planning

The speed-distance-time relationship is one of the most universally useful formulas in practical life: Distance = Speed × Time, or rearranged, Speed = Distance ÷ Time, and Time = Distance ÷ Speed. Whether you're planning a road trip, training for a race, estimating a shipping arrival, or calculating fuel costs, this relationship is the foundation. For runners and cyclists, pace (minutes per mile or kilometer) is the inverse of speed, it tells you how long it takes to cover a unit of distance rather than how far you go per unit of time. A 9-minute mile pace is a speed of 6.67 miles per hour. A 5:30/km pace is 10.9 km/h or 6.8 mph. Converting between pace and speed is a constant need for athletes tracking performance across different apps and devices. For road trips, the speed-distance-time formula has a practical wrinkle: average speed is almost never equal to posted speed limits. Real average speeds account for acceleration, deceleration, traffic, stops, and the time spent at stops. On a 300-mile highway drive at 70 mph with two 10-minute stops, your driving time is 300÷70 = 4.29 hours, but total trip time is 4.29 + 0.33 = 4.62 hours. Google Maps calculates average speed empirically from traffic data, much more accurate than pure speed-distance-time calculations for route planning.

CalculatorWizard Team Updated: 2026-04-10
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Speed Distance Time: Formula & Guide ()

The relationship between speed, distance, and time is one of the most fundamental formulas in physics and everyday life. Whether you're planning a road trip, training for a race, or doing physics homework, the same three formulas apply, you just choose which variable you need to solve for.

The Three Formulas

💡 Pro Tip: For real trip planning, add 10–15% to your calculated drive time for traffic and add 30 minutes per fuel stop. Pure math never accounts for reality.

All three variables are connected by one relationship: Distance = Speed × Time. Rearranged to solve for each:

Speed = Distance ÷ Time: How fast are you going?
Distance = Speed × Time: How far will you travel?
Time = Distance ÷ Speed: How long will it take?

Common Speed Reference Guide

ActivityTypical Speed (mph)Typical Speed (km/h)Notes
Walking2.5–44–6.4Avg ~3 mph
Jogging4–66.4–9.710 min/mile pace = 6 mph
Running6–109.7–16Elite: 12–15 mph
Cycling (casual)10–1516–24Flat terrain
Cycling (fast)18–2529–40Road bike
City driving25–3540–56With traffic lights
Highway driving60–7597–121US interstate avg
Commercial flight550–600885–966Cruising altitude
Sound (sea level)7671,235Mach 1
Light670,616,6291,079,252,848In vacuum

Speed Unit Conversions

FromTo mphTo km/hTo m/sTo knots
1 mph—× 1.60934× 0.44704× 0.86898
1 km/h× 0.62137—× 0.27778× 0.53996
1 m/s× 2.23694× 3.6—× 1.94384
1 knot× 1.15078× 1.852× 0.51444—
How long does it take to drive 300 miles at 65 mph?
Time = Distance ÷ Speed = 300 ÷ 65 = 4.615 hours = 4 hours 37 minutes. This is pure driving time with no stops. For a real road trip, add 15–30 minutes for fuel stops and 10–15 minutes for rest breaks every 2 hours. So realistically, a 300-mile trip at highway speeds takes about 5–5.5 hours door to door.
How do you convert mph to km/h?
Multiply mph by 1.60934 to get km/h. For a quick mental estimate, multiply by 1.6. So 60 mph ≈ 96 km/h, 70 mph ≈ 112 km/h, 100 mph ≈ 161 km/h. To go the other way (km/h to mph), multiply by 0.62137, or roughly multiply by 0.62 or divide by 1.6.
What is the formula for speed?
Speed = Distance ÷ Time. If you travel 150 miles in 2.5 hours, your average speed is 150 ÷ 2.5 = 60 mph. This gives you average speed, it doesn't account for variations during the trip. If you drove faster on the highway and slower through towns, 60 mph is still your average for the whole journey. Instantaneous speed (what your speedometer reads) is different from average speed.
How far can you drive in 8 hours?
Distance = Speed × Time. At 65 mph for 8 hours: 65 × 8 = 520 miles. At 70 mph: 560 miles. In practice, accounting for fuel stops, food, and rest breaks (recommended every 2 hours), you'd realistically cover 450–500 miles in an 8-hour travel day at highway speeds. The FMCSA (commercial driving rules) limits truck drivers to 11 hours of driving per day for safety reasons.
How do I calculate how long a trip will take?
Time = Distance ÷ Average Speed. Get the distance from Google Maps or similar, then estimate your average speed accounting for the road type. For a mixed route (city + highway), use 45–50 mph as your average. For mostly highway, use 55–65 mph. Add 10–15% for traffic, construction, and delays. Then add stop time separately, about 30 minutes per fuel stop and 15 minutes per rest break. The calculator above uses pure driving time; always add stop time for real trip planning.

Speed & Performance Tracking Tools

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Cycling Computer: Speed & Distance Tracker

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Track bike speed and distance automatically with a dedicated cycling computer.

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Physics for the Curious: Everyday Applications

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Understand the physics behind speed, distance, time, and motion in plain language.

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The Science of Running: Steve Magness

Physics of speed and training for runners
A deep dive into the biomechanics and physiology of running performance, covering how speed, distance, and training load interact for runners of all levels.
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✓Speed and pace science
✓Training load calculation
✓Performance optimization
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💡 Quick Answers

❓ How do I calculate speed, distance, or time?
The three formulas from one relationship: Speed = Distance ÷ Time. Distance = Speed × Time. Time = Distance ÷ Speed. Examples: A car travels 240 miles in 4 hours → Speed = 240÷4 = 60 mph. A train at 80 mph for 2.5 hours → Distance = 80×2.5 = 200 miles. How long to travel 350 miles at 65 mph? Time = 350÷65 = 5.38 hours = 5 hours 23 minutes. Always keep units consistent, if speed is in mph, distance must be in miles and time in hours.
❓ How do I convert running pace to speed?
Speed (mph) = 60 ÷ pace (min/mile). Pace (min/mile) = 60 ÷ speed (mph). Examples: 8:00/mile pace = 60÷8 = 7.5 mph. 6:00/mile pace = 60÷6 = 10 mph. 10:00/mile pace = 60÷10 = 6 mph. For kilometers: Speed (km/h) = 60 ÷ pace (min/km). A 5:00/km pace = 60÷5 = 12 km/h. A 6:30/km pace = 60÷6.5 = 9.23 km/h. Marathon finish times by pace: 4:00/km = 2:48 marathon, 5:00/km = 3:31 marathon, 6:00/km = 4:13 marathon.
❓ How do I estimate road trip travel time accurately?
Pure distance ÷ speed underestimates trip time significantly. For more accurate estimates: calculate driving time (distance ÷ average highway speed, typically 55-65 mph for realistic averages including slowdowns), add stop time (fuel stops ~10 min, meal stops ~30-45 min, restroom ~5 min, add one stop per 2-3 hours of driving), and add a 10-15% buffer for traffic, construction, and unexpected delays. A 500-mile trip at 65 mph average driving speed: 500÷65 = 7.7 hours driving + 2 fuel/restroom stops (20 min) + 1 meal stop (40 min) = approximately 9.2 hours total. Google Maps with traffic enabled gives the most accurate real-world estimate.