What is the difference between MPH, KPH, and knots?

MPH (miles per hour) is used primarily in the United States for road speeds. KPH (kilometers per hour) is the metric standard used worldwide for road speeds. Knots (nautical miles per hour) are used in aviation and maritime navigation. 1 nautical mile equals 1.852 kilometers, making knots slightly faster than KPH.

How do I convert MPH to KPH?

To convert MPH to KPH, multiply by 1.60934. For example, 60 MPH = 60 × 1.60934 = 96.56 KPH. This converter does the calculation automatically - just enter the MPH value and select KPH as the target unit.

How do I convert KPH to MPH?

To convert KPH to MPH, divide by 1.60934 (or multiply by 0.621371). For example, 100 KPH = 100 ÷ 1.60934 = 62.14 MPH. Simply enter the KPH value and select MPH as the target unit for automatic conversion.

What are knots used for?

Knots are primarily used in aviation and maritime navigation. Aircraft speeds, wind speeds, and ship speeds are typically measured in knots. One knot equals one nautical mile per hour. Nautical miles are used because they relate directly to latitude and longitude coordinates, making navigation easier.

How fast is 100 KPH in MPH?

100 KPH equals approximately 62.14 MPH. This is a common highway speed in many countries. To remember: 100 KPH is roughly equal to 60 MPH as a quick mental estimate.

What is the speed of sound in different units?

The speed of sound at sea level is approximately 661 knots, 761 MPH, or 1,225 KPH. This varies based on altitude and temperature. Aircraft speeds are often expressed as Mach numbers (e.g., Mach 1 = speed of sound, Mach 2 = twice the speed of sound).

Why does this converter show three decimal places?

Three decimal places provide high precision for speed conversions, which is important for aviation, maritime navigation, and scientific applications. Trailing zeros are automatically removed for cleaner display, so you only see the precision needed.

Speed Converter - MPH, KPH & Knots Conversion

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How to Use Speed Converter

How to Use the Speed Converter:

Enter Speed Value
- Type any speed value (positive numbers)
- Examples: 60, 100, 12.5, 500
Select Source Unit (From)
- MPH: Miles per Hour (imperial)
- KPH: Kilometers per Hour (metric)
- Knots: Nautical Miles per Hour (aviation/maritime)
Select Target Unit (To)
- Choose which unit to convert to
- Can convert between any two units
View Results Instantly
- Main result shows in the green card
- All three units displayed for reference
- Conversion happens as you type
Swap Units (Optional)
- Click "Swap Units" to reverse conversion direction
- Useful for quick back-and-forth comparisons
Try Example Speeds
- Highway Speed: 65 MPH (typical US highway)
- Flight Speed: 500 knots (commercial aircraft)
- Ship Speed: 25 knots (cargo ship)
Conversion Factors
- 1 MPH = 1.60934 KPH
- 1 Knot = 1.852 KPH
- 1 MPH = 0.868976 Knots
Common Speed References
- Highway limit: 65-75 MPH
- Commercial flight: 450-500 knots
- High-speed train: 200-300 KPH
- Speed of sound: 661 knots

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