Speed, Distance and Time Calculator
Free online Speed, Distance and Time Calculator that runs directly in your browser.
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Other tools you may find usefulSpeed, distance and time calculator - formula v=d/t
Three basic kinematics quantities: speed (v), distance (d), time (t). The formula v = d/t allows you to calculate any of them if you know the other two. The calculator supports various units (km/h, m/s, mph, knots, miles, km, feet) and converts automatically.
Formulas for speed, distance and time
Speed: v = d / t. Distance: d = v × t. Time: t = d / v. Example 1: I drove 150 km for 2 hours → v = 150/2 = 75 km/h. Example 2: How many km will I travel in 3 hours at 90 km/h? → d = 90×3 = 270 km. Example 3: When will I reach Krakow (300 km) driving 120 km/h? → t = 300/120 = 2.5h = 2h30min.
Speed unit conversions
1 km/h = 0.2778 m/s = 0.6214 mph = 0.5400 knot. 1 m/s = 3.6 km/h = 2.237 mph. 1 mph = 1.609 km/h = 0.4470 m/s. 1 knot = 1,852 km/h = 1,151 mph. Speed limits in Poland: 50 km/h (city), 90 km/h (single carriageways), 120 km/h (expressways), 140 km/h (motorways). Speed of sound: 343 m/s = 1235 km/h.
Speeds in sports and nature
Walking: 5-6 km/h. Recreational run: 8-10 km/h. Elite marathon: ~20 km/h. 100m elite sprint: ~37 km/h. Recreational bike: 15-20 km/h. Road bike (pro): 40-50 km/h. Car (city): 50 km/h. Express train: 200-350 km/h. Passenger plane: 900 km/h. Cheetah (fastest land): 120 km/h.
Average vs. instantaneous speed
Instantaneous speed: v(t) = dx/dt (derivative). Average speed: v_avg = Δd/Δt (total distance / time). Example: driving 100 km: 50 km/h for 1 hour, then 150 km/h for 20 minutes. v_avg = 100 km / (1h + 0.333h) = 75 km/h (not 100 km/h!). Important: average speed ≠ average speed.
Frequently asked questions
How to calculate travel time by car?
t = d/v. Warsaw-Krakow: 290 km at 120 km/h = 290/120 = 2.42h = 2h25min. Add: stops (every 2 hours = 15 min break). Traffic: A1, A2, A4 motorways - plan via Waze/Google Maps (real-time traffic). Real time is always longer than theoretical: accidents, traffic jams, roadworks, refueling.
How to calculate running speed based on time?
Time per km: 5:00/km = 300s/km = 1000m/300s = 3.33 m/s = 12 km/h. 4:00/km = 15 km/h. Marathon time: 3h = 42.195 km → 42.195/3 = 14.07 km/h = 4:16/km. 4h marathon: 3:24/km = 10.55 km/h. Pace calculator: running pace calculator (separate tool on this page).
How does speed affect fuel consumption?
Aerodynamic optimal: 80-100 km/h (minimum drag). Consumption increases with the square of the speed (air resistance ≈ v²). 130 km/h vs 100 km/h: approx. 20-30% more fuel. At 140 km/h: approx. 40% more than 100 km/h. ECO driving: constant speed, anticipation, avoid braking.
What is relative velocity?
Relative speed: the speed of one object as observed from another. Trains traveling in opposite directions at 100 km/h: relative speed = 200 km/h. Trains traveling in the same direction: 100-100 = 0 km/h (they appear to be stationary). Airplane with wind: ground speed = air speed + wind speed.
How to calculate speed in m/s from a stopwatch?
Measure the distance (using a meter). Measure your time with a stopwatch. v = d/t. 100m run: time 15s → v = 100/15 = 6.67 m/s = 24 km/h. Experiment: thrown a stone from a building 50m (without horizontal movement): t ≈ 3.2s (t = sqrt(2h/g) = sqrt(100/9.81)). v at impact = g×t = 9.81×3.2 = 31.4 m/s = 113 km/h.
Related tools: running pace calculator, speed converter and braking distance calculator.