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Speed Converter

Speed Conversion Calculator

Translate motion across metrics—whether it's km/h, mph, knots, or Mach.
Speed Converter

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      Updated on September 1, 2025

      About Our Speed Conversion Calculator

      Written By
      author
      Nadiba Rahman
      Reviewed by
      author
      Mrinmoy Roy
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      Our Speed Conversion Calculator offers quick and accurate conversions across multiple speed units, including m/s, km/h, mph, m/s, knots, and more. With support for 21 different speed units, it eliminates the hassle of manual calculations and potential errors, allowing you to switch smoothly between units with just a few clicks. In this article, I’ll explore how the speed converter works, the units it supports, and the helpful features that make converting speeds effortless and reliable.

      What is Speed?

      Speed measures how quickly something moves from one place to another. It shows how much distance an object covers in a certain time, without considering the direction of travel. The formula to calculate speed is:Speed = Distance / TimeIn simple terms, something moving at a high speed travels a lot of distance quickly, while something moving at a low speed covers less distance in more time.

      Speed can be measured in different units. On land, it's usually measured in kilometers per hour (km/h) or miles per hour (mph). At sea, it's measured in knots.

      Speed can be classified in different ways:
      1. Average speed: The total distance divided by the total time taken.
      2. Instantaneous speed: The speed at a specific moment in time.

      Conversion Units of Our Speed Converter

      Our speed conversion calculator lets you convert between 21 different speed units instantly. Here is the list of available units:
      1. Centimeter per Minute (cm/min): This small-scale unit is often used in slow-moving systems or machinery.
      2. Centimeter per Second (cm/s): Commonly used in scientific calculations for precise, small-scale measurements.
      3. Feet per Hour (ft/h): A unit used for extremely slow movements, often in environmental studies.
      4. Feet per Minute (ft/min): Commonly used in industrial and mechanical engineering applications.
      5. Feet per Second (ft/s): Frequently used in physics and sports to measure medium-speed objects.
      6. Inch per Minute (in/min): Typically used for smaller machinery and precision tools.
      7. Inch per Second (in/s): Used in industrial systems requiring moderate speeds.
      8. Kilometer per Hour (km/h): The most commonly used unit globally for vehicle speeds.
      9. Kilometer per Second (km/s): A high-speed unit used in astronomical calculations.
      10. Knots (kn): A unit used in maritime and aviation contexts. 1 knot equals 1 nautical mile per hour.
      11. Mach Number: Represents the speed of an object relative to the speed of sound in the surrounding medium.
      12. Meter per Hour (m/h): A rarely used unit, suitable for extremely slow systems.
      13. Meter per Minute (m/min): Used in industrial and mechanical calculations.
      14. Meter per Second (m/s): The SI unit for speed, used universally in science and engineering.
      15. Mile per Hour (mph): Widely used in the US and the UK for vehicle speeds.
      16. Mile per Minute (mpm): A high-speed unit, mainly used in aviation.
      17. Mile per Second (mps): Used for extremely high-speed measurements, such as spacecraft.
      18. Nautical Mile per Day (nmi/day): A unit used in long-distance maritime navigation.
      19. Nautical Mile per Hour (nmi/h): It is equivalent to knots, used in the maritime and aviation industries.
      20. Yards per Hour (yd/h): A slow-speed unit, occasionally used in small-scale applications.
      21. Yards per Minute (yd/min): Useful for measuring slightly faster movements in localized systems.

      How to Use Our Speed Conversion Calculator?

      Here’s a step-by-step guide to using our speed conversion calculator:
      1. Select the input and output units you want to convert from and to.
        Select input and output speed units
      2. Enter a value of the speed unit in the input field.
        Enter the speed value in source unit
      3. The calculator instantly shows the converted result in the target unit, ready for you to copy and use.
        View the converted output in target unit

      Features of Our Speed Conversion Calculator

      Our speed conversion calculator has several simple and helpful features to make speed unit conversions quick and accurate. You’ll find all these features in the settings menu, and the image below shows the default settings for each one.
      Settings menu of speed conversion calculator
      Here’s a closer look at what makes our speed converter so reliable and user-friendly:

      Customizable Decimal Precision

      Even a small change in decimal places can influence measurements, calibration, or data interpretation in speed conversions. That’s why our speed converter has a customizable decimal precision option.

      You can adjust it to match exactly how precise you want your result to be. By default, it’s set to 6 decimal places, but you can choose anywhere from 0 to 12.

      For example, converting 100 kilometers per hour (km/h) to meters per second (m/s) with 10 decimal places will show 27.7777777778 m/s instead of just 27.777778 m/s, as you can see in the image below.
      Customizable decimal precision

      Rounding Mode Options

      Rounding can impact your speed data, test results, or analysis. To give you control, our calculator lets you decide how to round your numbers: round up, round down, or no rounding at all. This makes sure your conversion values meet your project’s exact needs and helps prevent calculation errors.

      Multiple Number Display Format

      Our calculator supports three ways to display your numbers:
      1. Standard Decimal (e.g. 12.34524502)
      2. Scientific Notation (e.g. 1.2345245e+1)
      3. Engineering Format (e.g. 1.2345245 × 10^1)
      Standard decimal format works well for most conversions. But speeds can range from very slow, like centimeters per minute (cm/min), to extremely fast, like kilometers per second (km/s). Using clear formats makes your data easier to read, understand, and share.

      For example, converting 1,000,000 cm/min to m/s shows 166.6667 m/s in decimal format, (1.666667e+2) m/s in scientific notation, and (1.666667 × 10^2) m/s in engineering format.

      Instant Multi-unit Conversion

      If you want to see the same speed value in different units, converting them one by one is slow and can be confusing. Our real-time multi-unit conversion feature automatically shows your value in all supported units at once. This saves time and lets you compare speeds quickly during experiments, design work, or analysis.
      Real-time multi-unit conversion

      Thousand Separators Toggle

      During speed conversions, big numbers can be hard to read, and it’s easy to make a mistake if you’re not careful. Our calculator includes a thousand-separators option, adding commas to make large numbers clear and simple to review.

      For example, 9876543 m/s becomes 9,678,543 m/s, so you can spot mistakes more easily and work faster.

      Integrated Built-in Calculator

      When you need to calculate acceleration, average speed, or any related value before converting, switching between apps can slow you down. That’s why we built a scientific calculator directly into the tool. You can perform your calculations here and instantly send the result to the converter without any extra steps.

      Easy Unit Swap

      Often, you need to convert speeds back and forth, like from miles per hour (mph) to meters per second (m/s) and back again. Doing it manually can waste time and cause errors.

      Our one-click unit swap feature lets you instantly switch input and output units, so you can easily double-check your work or see the reverse conversion without effort.

      Auto-Saved Conversion History

      If you’re doing several conversions one after another, it’s easy to lose track of what you’ve done. Re-entering past data can be a hassle and cause mistakes. That’s why we’ve built an automatic conversion history feature that saves your last 10 conversions, even if you close or refresh the page.
      Recent 10 conversion history
      Go to History to quickly access your previous results whenever you need them. This keeps your work organized and helps you stay focused.

      Speed Conversion Table

      Click the button below to download the Speed Conversion Chart. It’s a quick reference with conversion ratios for all your speed-related conversions.

      3 Examples of Conversion With Our Speed Converter

      To convert between speed units, simply multiply the original speed by the correct conversion factor (available in the Speed Conversion Chart above). The formula is simple:

      Converted Value = Conversion Factor × Value of Source Unit

      Here are three quick examples of speed conversion:

      Miles per hour (mph) to Kilometers per hour (km/h) Conversion

      To convert mph to km/h, multiply the mph value by the conversion factor 1.609343. For example, to convert 60 mph to km/h:

      60 × 1.609343 = 96.56058 km/h
      Covnersion between Miles per hour and Kilometers per hour
      For reverse conversion (km/h to mph), multiply the km/h value by 0.621372.

      Feet per second (ft/s) to Meters per second (m/s) Conversion

      To convert ft/s to m/s, multiply the ft/s value by 0.3048. For example, to convert 30 ft/s to m/s:

      30 × 0.3048 = 9.144 m/s
      Conversion between Feet per second and Meters per second
      For reverse conversion (m/s to ft/s), multiply the m/s value by 3.28084.

      Knots to Miles per hour (mph) Conversion

      To convert knots to mph, multiply the knots value by 1.150778. For example, to convert 45 knots to mph:

      45 × 1.150778 = 51.78501 mph
      Conversion between Knots and Miles per hour
      For reverse conversion (mph to knots), multiply the mph value by 0.868977.

      Conclusion

      In conclusion, our speed conversion calculator is a user-friendly tool that delivers instant and accurate conversions across a wide variety of speed units. Featuring real-time formula previews and automatic conversion history tracking, it simplifies your calculations and helps maintain accuracy. Use this tool on any device, anytime, and make speed conversions faster and error-free.
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      Frequently Asked Questions [FAQs]