Physics Unit Converter

Convert between different physics units for force, energy, power, and pressure. Enter a value and select units to see instant conversions.

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About Physics Units

Force

Force is any interaction that changes the motion of an object. The SI unit is the Newton (N), where 1 N = 1 kg·m/s². One Newton is the force required to accelerate 1 kilogram of mass at 1 meter per second squared.

• Newton (N): SI unit of force
• Pound-force (lbf): Force exerted by gravity on one pound of mass (≈ 4.448 N)
• Dyne: CGS unit (1 dyn = 10⁻⁵ N)
• Kilogram-force (kgf): Force exerted by gravity on 1 kg (≈ 9.81 N)

Energy

Energy is the capacity to do work. The SI unit is the Joule (J), where 1 J = 1 N·m = 1 kg·m²/s². Energy exists in many forms: kinetic, potential, thermal, chemical, electrical, etc.

• Joule (J): SI unit of energy
• Calorie (cal): Energy to raise 1g of water by 1°C (≈ 4.184 J)
• Kilowatt-hour (kWh): Common for electrical energy (3.6 MJ)
• BTU: British Thermal Unit (≈ 1055 J)
• Electronvolt (eV): Atomic-scale energy (≈ 1.602 × 10⁻¹⁹ J)

Power

Power is the rate of energy transfer or work done per unit time. The SI unit is the Watt (W), where 1 W = 1 J/s. Power measures how quickly energy is used or produced.

• Watt (W): SI unit of power (1 J/s)
• Horsepower (hp): Traditional unit (1 hp ≈ 746 W)
• Kilowatt (kW): Common for electrical appliances (1000 W)
• Megawatt (MW): Used for power plants (1,000,000 W)

Pressure

Pressure is force per unit area. The SI unit is the Pascal (Pa), where 1 Pa = 1 N/m². Pressure is experienced in fluids, gases, and when forces act on surfaces.

• Pascal (Pa): SI unit of pressure (1 N/m²)
• Atmosphere (atm): Standard atmospheric pressure (101,325 Pa)
• Bar: Meteorological unit (100,000 Pa)
• PSI: Pounds per square inch (≈ 6895 Pa)
• mmHg (Torr): Blood pressure unit (≈ 133.3 Pa)

Common Conversions

• 1 kgf ≈ 9.81 N
• 1 lbf ≈ 4.448 N
• 1 kcal ≈ 4184 J
• 1 kWh = 3.6 MJ
• 1 hp ≈ 746 W
• 1 atm = 101,325 Pa = 14.7 psi

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