--- title: "KPH to MPH Converter — Chart & Live Calculator" description: "Convert km/h to mph instantly with a live two-way calculator, plus a full kph-to-mph chart from 5 to 300 km/h. Free, no sign-up." source: "https://speedometer.app/kph-to-mph/" image: "https://speedometer.app/og_image.webp" --- # KPH to MPH Converter Type a speed in either box for an instant, two-way conversion between kilometres per hour (km/h) and miles per hour (mph). Below the calculator you'll find a full kph-to-mph chart for the common values. Kilometres per hour (km/h) \= Miles per hour (mph) Exact definition: 1 mph = 1.609344 km/h; 1 km/h ≈ 0.621371 mph. Editing either field updates the other, rounded to two decimal places. [Use the live GPS speedometer](/online-speedometer/) for a GPS-based speed estimate while moving. It shows one selected unit at a time: switch between mph, km/h and knots. Location permission and usable location data are required. [![Download on the App Store](/_image/?href=%2F_astro%2FDownload_on_the_App_Store_Badge_US-UK_RGB_blk_092917.CVyK0T4N.svg&w=192&h=64&f=svg)](https://apps.apple.com/app/apple-store/id901574501?pt=100782816&ct=web.speedometer.app.converter&mt=8) ## KPH to MPH Chart Common speeds from 5 to 300 km/h, converted both directions. Read left-to-right for km/h → mph, or use the right pair for mph → km/h. | km/h | → mph | mph | → km/h | | --- | --- | --- | --- | | 5 km/h | 3.1 mph | 5 mph | 8 km/h | | 10 km/h | 6.2 mph | 10 mph | 16.1 km/h | | 15 km/h | 9.3 mph | 15 mph | 24.1 km/h | | 20 km/h | 12.4 mph | 20 mph | 32.2 km/h | | 25 km/h | 15.5 mph | 25 mph | 40.2 km/h | | 30 km/h | 18.6 mph | 30 mph | 48.3 km/h | | 40 km/h | 24.9 mph | 40 mph | 64.4 km/h | | 50 km/h | 31.1 mph | 50 mph | 80.5 km/h | | 60 km/h | 37.3 mph | 60 mph | 96.6 km/h | | 70 km/h | 43.5 mph | 70 mph | 112.7 km/h | | 80 km/h | 49.7 mph | 80 mph | 128.7 km/h | | 90 km/h | 55.9 mph | 90 mph | 144.8 km/h | | 100 km/h | 62.1 mph | 100 mph | 160.9 km/h | | 110 km/h | 68.4 mph | 110 mph | 177 km/h | | 120 km/h | 74.6 mph | 120 mph | 193.1 km/h | | 130 km/h | 80.8 mph | 130 mph | 209.2 km/h | | 140 km/h | 87 mph | 140 mph | 225.3 km/h | | 160 km/h | 99.4 mph | 160 mph | 257.5 km/h | | 180 km/h | 111.8 mph | 180 mph | 289.7 km/h | | 200 km/h | 124.3 mph | 200 mph | 321.9 km/h | | 220 km/h | 136.7 mph | 220 mph | 354.1 km/h | | 240 km/h | 149.1 mph | 240 mph | 386.2 km/h | | 260 km/h | 161.6 mph | 260 mph | 418.4 km/h | | 280 km/h | 174 mph | 280 mph | 450.6 km/h | | 300 km/h | 186.4 mph | 300 mph | 482.8 km/h | Table values are rounded to one decimal place. The calculation uses 1 mph = 1.609344 km/h exactly; 0.621371 is a rounded reciprocal. ## How to convert kilometers per hour to miles per hour To convert **kph to mph**, divide the speed by **1.609344**. This follows from the exact definition 1 mile = 1.609344 kilometres. Multiplying by 0.621371 gives an approximation because that reciprocal is rounded. The calculator uses the full reciprocal and rounds only the displayed result. The unit matters as much as the number. **100 km/h ≈ 62.1 mph**, while 100 mph ≈ 160.9 km/h. These are different speeds despite the matching starting number. Check the input unit and conversion direction before comparing values from a chart, a device or a journey record. Useful numerical reference points: **30 km/h ≈ 18.6 mph**; **50 km/h ≈ 31.1 mph**; **90 km/h ≈ 55.9 mph**; **120 km/h ≈ 74.6 mph**. Each result is rounded to one decimal place. Enter another value in the converter to see the same relationship at a different speed. The spellings “kph”, “kmph” and “km/h” refer to kilometres per hour; km/h is the standard notation. A **kph to mph chart** changes the unit of a number, not the quality of its measurement. A dashboard and a GPS device can still disagree because calibration, reception and measurement methods differ. ![The Units & Display section of the app settings, with the speed-unit picker showing KM/H selected next to MPH and KN options.](/images/photos/settings/units-display.webp) Skip the mental maths: set GPS Speedometer to mph, km/h, or knots in Settings → Units & Display and read your speed directly. ## When you need to convert while you're driving A chart is perfect when you're planning at the kitchen table. But the awkward moments happen in motion: you've picked up a **rental car abroad** with a dashboard reading in km/h and every mental reference you have is in mph — or the reverse. Doing the multiplication at 120 km/h is exactly when you shouldn't be looking away from the road. The same problem shows up with an **imported car** whose speedometer only shows the units of its origin market, and on the water, where a **boat's instruments** may read in knots while your harbour speed limit is posted in km/h or mph. In all of these, what you want isn't a conversion table — it's a display that already shows the unit you think in. The [free live GPS speedometer](/online-speedometer/) runs without an app installation and shows a GPS-based speed estimate in your selected unit. Its reading depends on location permission and usable position data. The [MPH speedometer app](/mph-speedometer/) offers a large readout and a basic windshield HUD. Enhanced HUD features and Picture-in-Picture require PRO; the display is not a guarantee of measurement accuracy or continuous availability. [![Download on the App Store](/_image/?href=%2F_astro%2FDownload_on_the_App_Store_Badge_US-UK_RGB_blk_092917.CVyK0T4N.svg&w=192&h=64&f=svg)](https://apps.apple.com/app/apple-store/id901574501?pt=100782816&ct=web.speedometer.app.converter&mt=8)[Explore the MPH speedometer →](/mph-speedometer/) Converting the other way? Use the [MPH to KPH converter](/mph-to-kph/) — same live calculator and chart, mph → km/h. Working with nautical speeds? Use the [knots to mph converter](/knots-to-mph/), which also shows km/h. ## KPH to MPH — frequently asked ### How do you convert kph to mph? To convert kph to mph, divide the speed by 1.609344. This follows from the exact definition 1 mile = 1.609344 kilometres. Multiplying by 0.621371 gives an approximation because that reciprocal is rounded. The calculator uses the full reciprocal and rounds only the displayed result. ### What is 90 km/h in mph? 90 km/h ÷ 1.609344 ≈ 55.9 mph. Rounded to one decimal place. This is a unit conversion, not a road-limit recommendation. ### What is 100 kph in mph? 100 km/h ÷ 1.609344 ≈ 62.1 mph. Rounded to one decimal place. This is a unit conversion, not a road-limit recommendation. ### Is kph the same as km/h? Yes. "kph", "km/h", "kmh" and "kilometers per hour" all mean the same unit — kilometres travelled per hour. The official written form is km/h; kph is the common shorthand. ## Stop converting in your head View a GPS speed estimate in your choice of mph, km/h or knots on your phone. ![Speedometer App QR Code](/_image/?href=%2F_astro%2Fqr-code.31-RE7kI.png&w=640&h=640&q=85&f=webp) [![Download on the App Store](/_image/?href=%2F_astro%2FDownload_on_the_App_Store_Badge_US-UK_RGB_blk_092917.CVyK0T4N.svg&w=192&h=64&f=svg)](https://apps.apple.com/app/apple-store/id901574501?pt=100782816&ct=web.speedometer.app.converter&mt=8) Free on the App Store. No sign-up.