Math

speed distance time calculator

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate speed, distance, or time from the other two values. Any units. Free SDT calculator.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

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The Speed-Distance-Time Triangle

Three formulas from one relationship: Speed = Distance / Time. Distance = Speed x Time. Time = Distance / Speed. Know any two, solve for the third. Driving 240 miles at 60 mph takes 4 hours. Running 5 miles in 40 minutes means 7.5 mph average speed. These calculations apply to any moving object — cars, runners, planes, ships.

Real-World Applications

Road trips: How long will 450 miles take at 65 mph? 6.9 hours driving time (add 30-60 minutes for stops). Running: To finish a 10K in 50 minutes, what pace? 10K = 6.21 miles, so 6.21/0.833 hours = 7.45 mph = 8:03/mile pace. Delivery estimates: Package 200 miles away via truck at 55 mph average = 3.6 hours transit time.

⚡ CalcWolf Insight

GPS apps calculate arrival times using this exact formula with real-time traffic adjustments. The speed-distance-time relationship is the most applied physics equation in daily life.

Frequently asked questions

How long does it take to drive 100 miles?▾

At 60 mph: 1 hour 40 minutes. At 70 mph: 1 hour 26 minutes. At 55 mph: 1 hour 49 minutes. These are pure driving times — add 10-15 minutes per hour for traffic, stops, and speed variations on real roads.

How do I calculate average speed?▾

Total distance divided by total time. If you drive 180 miles in 3 hours (including a 20-minute stop), your average speed is 180/3 = 60 mph. Note this includes the stop time — your moving speed was faster but your average accounts for all time elapsed.

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Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →