Speed Calculator

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Speed Calculator
Calculate Speed (v = d / t)Calculate Distance (d = v * t)Calculate Time (t = d / v)
Miles / Hours (mph)Kilometers / Hours (km/h)Meters / Seconds (m/s)
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function updateLabels(){var type=document.getElementById('calc_type').value;var l1=document.getElementById('label1');var l2=document.getElementById('label2');var i1=document.getElementById('input1');var i2=document.getElementById('input2′);if(type==='speed'){l1.innerHTML='Distance:';l2.innerHTML='Time:';i1.placeholder='Enter distance';i2.placeholder='Enter time';}else if(type==='distance'){l1.innerHTML='Speed:';l2.innerHTML='Time:';i1.placeholder='Enter speed';i2.placeholder='Enter time';}else if(type==='time'){l1.innerHTML='Distance:';l2.innerHTML='Speed:';i1.placeholder='Enter distance';i2.placeholder='Enter speed';}}function calculateSpeed(){var type=document.getElementById('calc_type').value;var v1=parseFloat(document.getElementById('input1').value);var v2=parseFloat(document.getElementById('input2').value);var units=document.getElementById('unit_type').value;var showSteps=document.getElementById('steps').checked;var ansDiv=document.getElementById('answer');if(isNaN(v1)||isNaN(v2)||v2<=0){ansDiv.innerHTML='Please enter valid positive numbers.';return;}var result=0;var unitLabel=";var formula=";var stepsTxt=";if(type==='speed'){result=v1/v2;unitLabel=(units==='mph'?'mph':(units==='kmh'?'km/h':'m/s'));formula='Speed = Distance / Time';if(showSteps){stepsTxt='
Steps:
1. Identify values: Distance = '+v1+', Time = '+v2+'
2. Apply formula: '+v1+' / '+v2+'
3. Result: '+result.toFixed(2)+' '+unitLabel;}}else if(type==='distance'){result=v1*v2;unitLabel=(units==='mph'?'miles':(units==='kmh'?'km':'meters'));formula='Distance = Speed * Time';if(showSteps){stepsTxt='
Steps:
1. Identify values: Speed = '+v1+', Time = '+v2+'
2. Apply formula: '+v1+' * '+v2+'
3. Result: '+result.toFixed(2)+' '+unitLabel;}}else if(type==='time'){result=v1/v2;unitLabel=(units==='mph'?'hours':(units==='kmh'?'hours':'seconds'));formula='Time = Distance / Speed';if(showSteps){stepsTxt='
Steps:
1. Identify values: Distance = '+v1+', Speed = '+v2+'
2. Apply formula: '+v1+' / '+v2+'
3. Result: '+result.toFixed(2)+' '+unitLabel;}}ansDiv.innerHTML='
Result = '+result.toFixed(2)+' '+unitLabel+'
Formula used: '+formula+'
'+stepsTxt;}

Calculator Use

The speed calculator is a versatile tool designed to help you solve for any of the three variables in the motion equation: speed, distance, or time. Whether you are planning a road trip, analyzing athletic performance, or solving physics problems, this calculator provides instant and accurate results.

To use this calculator, simply select the variable you want to find from the dropdown menu, enter the two known values, and choose your preferred units of measurement.

Distance
The total length of the path traveled between two points (e.g., miles, kilometers, or meters).
Time
The duration it takes to cover the distance (e.g., hours, minutes, or seconds).
Speed (Velocity)
The rate at which an object covers distance (e.g., miles per hour or kilometers per hour).

How It Works

The relationship between these three variables is fundamental to classical mechanics. When you use the speed calculator, it applies one of the following three algebraic variations of the basic motion formula:

v = d / t | d = v × t | t = d / v

  • v represents the average speed.
  • d represents the total distance.
  • t represents the elapsed time.

Calculation Examples

Example 1: Finding Speed
Suppose you drove 150 miles in 2.5 hours. To find your average speed:

  1. Distance = 150 miles
  2. Time = 2.5 hours
  3. Calculate: 150 / 2.5 = 60
  4. Result: 60 mph

Example 2: Finding Distance
If a cyclist travels at a constant speed of 15 km/h for 3 hours, how far do they go?

  1. Speed = 15 km/h
  2. Time = 3 hours
  3. Calculate: 15 × 3 = 45
  4. Result: 45 km

Common Questions

What is the difference between speed and velocity?

While often used interchangeably in casual conversation, speed is a scalar quantity (it only has magnitude), whereas velocity is a vector quantity (it has both magnitude and direction). This speed calculator determines the scalar rate of motion.

How do I convert between mph and km/h?

To convert miles per hour to kilometers per hour, multiply the value by 1.60934. To convert km/h to mph, divide the value by 1.60934 or multiply by 0.621371. Our speed calculator handles these units automatically based on your selection.

Can this calculator be used for running pace?

Yes! Simply enter the distance of your run and the time it took. For example, a 5k run (3.1 miles) in 25 minutes (0.416 hours) would result in a speed of roughly 7.45 mph.

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