# KMH to MPH Convert kilometers per hour to miles per hour with configurable decimal precision > Canonical page: https://elysiatools.com/en/tools/kmh-to-mph - **Category:** Math & Numbers - **Keywords:** kmh, mph, speed, conversion, kilometers per hour, miles per hour ## Overview Convert kilometers per hour to miles per hour instantly with configurable decimal precision. This utility accepts any numeric speed value in km/h and returns the equivalent mph measurement, letting you set decimal places from 0 to 10 for engineering specifications, automotive documentation, or regulatory compliance. ## Inputs - **Kilometers per hour** (text): e.g. 100 - **Decimal Precision** (number) ## When to use - Translating vehicle speedometer readings from metric to imperial units for international fleet reports or DOT compliance filings. - Converting meteorological wind speed measurements for aviation briefings or maritime weather assessments. - Standardizing athletic pace data when comparing international race results or calibrating training equipment across regions. ## How it works - Enter the speed value in kilometers per hour into the Kilometers per hour input field. - Set your desired decimal precision between 0 and 10 places, or accept the default of 3 decimals. - The tool multiplies the km/h value by 0.621371 to calculate the exact mph equivalent. - Receive a JSON output containing both the original km/h input and the converted mph result. ## Use cases - Automotive engineers validating speedometer calibrations against international vehicle specifications. - Flight operations teams converting meteorological wind velocity readings for pre-flight planning. - Sports analysts standardizing running or cycling pace data from international competitions. ## Frequently asked questions ### What conversion formula does the tool use? The tool uses the standard conversion factor where 1 km/h equals 0.621371 mph. ### Can I convert fractional speeds like 65.5 km/h? Yes, the input accepts decimal values and fractional speeds for precise calculations. ### What is the maximum decimal precision available? You can configure up to 10 decimal places for high-precision engineering or scientific requirements. ### Is the output format suitable for API integration? Yes, the tool returns structured JSON that can be parsed by applications, spreadsheets, or automated scripts. ### Does the tool support batch conversion of multiple values? 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