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Speeding Calculator

See how much time speeding saves and how much impact energy rises

Imperial mode uses miles for distance and miles per hour for speed.
mi
mph
mph
Safety note: This calculator shows time and physics proxies only. It is not legal or safety advice, and speeding can increase crash risk and severity.
Time Saved
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Time at Limit
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Time at Your Speed
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Speed Over Limit
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Impact Energy Proxy
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Aerodynamic Demand Proxy
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Minutes Saved Per Distance
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Calculation Steps

    What the Speeding Calculator Shows

    Small time savings can come with a large increase in speed-related impact forces.

    Time saved

    Trip time is distance divided by speed. The time saved is the difference between driving at the posted limit and the faster speed.

    Impact energy proxy

    Kinetic energy rises with speed squared. A 20% speed increase means roughly 44% more kinetic energy in this simplified comparison.

    Aerodynamic demand proxy

    Aerodynamic power demand rises roughly with speed cubed, so higher cruising speeds can require much more power even before traffic and terrain are considered.

    Speeding Examples

    Compare the minutes saved with the speed and energy increase.

    60 miles: 60 mph vs 75 mph

    Time falls from 60 minutes to 48 minutes, saving 12 minutes

    Short errand

    On a 10-mile trip, 45 mph instead of 35 mph saves about 3.8 minutes

    Metric highway

    100 km at 120 km/h instead of 100 km/h saves about 10 minutes