KPH to Mach Speed Converter

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KPH to Mach Mach to KPH

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Understanding KPH and Mach

1. Kilometers per Hour (kph)

• Standard metric unit for speed measurement
• Commonly used in road transport and weather reporting worldwide
• 1 kph = 0.277778 meters per second

2. Mach Number (M)

• Dimensionless unit representing speed relative to the speed of sound
• Mach 1 = speed of sound (varies with altitude and temperature)
• Critical in aviation and aerospace engineering
• Standard reference: 1,225 kph at sea level (15°C)

Conversion Formulas

Basic Conversion at Sea Level (15°C)

$$\text{Mach}=\frac{\text{KPH}}{1225}$$

KPH to Mach (General Formula)

$$\text{Mach}=\frac{\text{KPH}}{\text{Speed of Sound (kph at current conditions)}}$$

Mach to KPH

$$\text{KPH}=\text{Mach}\times \text{Speed of Sound}$$

Speed of Sound Variations

Altitude	Temperature	Speed of Sound (kph)
Sea Level	15°C	1,225
10,000 m	-50°C	1,062
20,000 m	-56°C	1,030
30,000 m	-46°C	1,082

Practical Conversion Examples

At Sea Level (1,225 kph = Mach 1)

• Example 1: Convert 980 kph to Mach

$$\frac{980}{1225}=0.8\text{ Mach}$$

• Example 2: Convert Mach 2.3 to kph

$$2.3\times 1225=2,817.5\text{ kph}$$

At 10,000m (1,062 kph = Mach 1)

• Example: Convert 850 kph to Mach

$$\frac{850}{1062}=0.8\text{ Mach}$$

Conversion Table (Sea Level Reference)

KPH	Mach	Speed Category
245	0.2	Subsonic
612.5	0.5	Subsonic
1,225	1.0	Transonic
1,837.5	1.5	Supersonic
2,450	2.0	Supersonic
3,675	3.0	Supersonic
6,125	5.0	Hypersonic

Mach	KPH	Example Vehicles
0.8	980	Commercial Jets
1.0	1,225	Sound Barrier
1.2	1,470	Fighter Jets
2.0	2,450	Concorde
3.0	3,675	SR-71 Blackbird
5.0	6,125	Hypersonic Missiles