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Convert MPH to KM/H

Convert speed units instantly: meters per second, km/h, mph, knots and feet per second.

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    Result

    This page opens the speed converter preset to miles per hour → kilometers per hour. One mph is exactly 1.609344 km/h — the same 1959 definition that fixes the mile at 1,609.344 meters — so km/h = mph × 1.609344 with no approximation.

    Anchors from real roads: 30 mph in a British town is 48.3 km/h, 55 mph is 88.5 km/h, 60 mph is 96.6 km/h, 70 mph on a UK motorway is 112.7 km/h, and 80 mph is 128.7 km/h. Hurricane-force wind starts at 74 mph ≈ 119 km/h.

    This direction helps when renting a car abroad, reading American or British car reviews, following NASCAR or IndyCar speeds and interpreting US weather warnings. Enter mph on the left, get km/h on the right — or swap the units with one click.

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    Executed in Browser

    Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

    Accepted Formats & Rules

    • Five units: m/s, km/h, mph, knots, ft/s.
    • Two-way live fields with instant swap.
    • Common-values table with driving, sailing and physics speeds.

    Key Benefits

    ✓ Exact ratios only (1 mph = 1.609344 km/h, 1 knot = 1.852 km/h by definition) — no rounded approximations.
    ✓ Live two-way conversion: type in either field and the other updates instantly, with one-click unit swap.
    ✓ Runs fully in your browser and keeps working offline — nothing is sent to any server.

    Use Cases

    • • Translate speed limits between km/h and mph when driving or renting a car abroad.
    • • Convert wind and vessel speeds from knots to km/h for sailing and weather forecasts.
    • • Turn meters per second from physics problems into everyday km/h.