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Engineering Unit Converters

Professional converters for torque, power, pressure, frequency, speed, and energy. Includes formulas, worked examples, and typical engineering values.

⚙️ Torque Converters

Convert between Newton-meters, foot-pounds, inch-pounds, kilogram-force meters, and more.

Open Converter →

N·m → ft·lb

× 0.737562

100 N·m = 73.76 ft·lb

ft·lb → N·m

× 1.35582

50 ft·lb = 67.79 N·m

N·m → in·lb

× 8.85075

10 N·m = 88.51 in·lb

kgf·m → N·m

× 9.80665

5 kgf·m = 49.03 N·m

⚡ Power Converters

Convert between watts, kilowatts, horsepower (mechanical, metric, electrical), BTU/hr, and more.

Open Converter →

HP → Watts

× 745.7

5 HP = 3,728.5 W

kW → HP

× 1.34102

10 kW = 13.41 HP

Watts → BTU/hr

× 3.41214

1,000 W = 3,412 BTU/hr

kW → BTU/hr

× 3412.14

2 kW = 6,824 BTU/hr

🔬 Pressure Converters

Convert PSI to bar, Pascal, kPa, atm, mmHg, and all major pressure units.

Open Converter →

PSI → Bar

÷ 14.5038

30 PSI = 2.068 bar

Bar → PSI

× 14.5038

2 bar = 29.01 PSI

PSI → Pascal

× 6894.76

1 PSI = 6,894.76 Pa

kPa → PSI

× 0.14504

200 kPa = 29.01 PSI

📡 Frequency & Wavelength

Convert between Hz, kHz, MHz, GHz, RPM, rad/s, and wavelength in various units.

Open Converter →

Hz → kHz

÷ 1,000

50,000 Hz = 50 kHz

MHz → Hz

× 1,000,000

2.4 MHz = 2,400,000 Hz

RPM → Hz

÷ 60

3,000 RPM = 50 Hz

Hz → rad/s

× 6.28318

50 Hz = 314.16 rad/s

🏎️ Speed & Velocity

Convert km/h, mph, m/s, knots, Mach, and more for automotive and aerospace applications.

Open Converter →

km/h → mph

× 0.621371

100 km/h = 62.14 mph

mph → km/h

× 1.60934

60 mph = 96.56 km/h

m/s → km/h

× 3.6

10 m/s = 36 km/h

Knots → km/h

× 1.852

50 kn = 92.6 km/h

🔋 Energy Converters

Convert joules, kilojoules, calories, kilocalories, kWh, BTU, and more.

Open Converter →

kJ → kcal

÷ 4.18400

100 kJ = 23.9 kcal

kWh → MJ

× 3.6

1 kWh = 3.6 MJ

BTU → Joules

× 1055.06

10 BTU = 10,550.6 J

cal → Joules

× 4.18400

500 cal = 2,092 J

Typical Engineering Values for Reference

ContextTypical Value
Car engine torque200–500 N·m (150–370 ft·lb)
Car engine power75–300 kW (100–400 HP)
Bicycle tire pressure60–120 PSI (4.1–8.3 bar)
Car tire pressure30–35 PSI (2.0–2.4 bar)
AC power frequency (US)60 Hz
AC power frequency (EU)50 Hz
Wi-Fi 2.4 GHz band2,400 MHz = 2.4 GHz
Highway speed limit (US)65 mph = 104.6 km/h
Human calorie intake (daily)2,000 kcal = 8,368 kJ

Frequently Asked Questions

How do I convert Newton-meters to foot-pounds?

Multiply N·m by 0.737562. Example: 100 N·m × 0.737562 = 73.76 ft·lb. Reverse: multiply ft·lb by 1.35582.

How do I convert horsepower to watts?

Multiply mechanical HP by 745.7. Example: 5 HP × 745.7 = 3,728.5 W. Reverse: divide watts by 745.7.

How do I convert PSI to bar?

Divide PSI by 14.5038. Example: 30 PSI ÷ 14.5038 = 2.068 bar. Reverse: multiply bar by 14.5038.

How do I convert RPM to Hz?

Divide RPM by 60. Example: 3,000 RPM ÷ 60 = 50 Hz. Reverse: multiply Hz by 60.

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