Physics Conversion Chart
| Quantity | From | To | Factor |
|---|---|---|---|
| Length | 1 meter | 3.28084 feet | ×3.28084 |
| Length | 1 km | 0.62137 miles | ×0.62137 |
| Mass | 1 kg | 2.20462 lbs | ×2.20462 |
| Force | 1 Newton | 0.22481 lbf | ×0.22481 |
| Energy | 1 Joule | 0.23901 cal | ×0.23901 |
| Pressure | 1 atm | 14.696 PSI | ×14.696 |
| Temperature | 0 °C | 32 °F | (°C×9/5)+32 |
| Speed | 1 m/s | 3.28084 ft/s | ×3.28084 |
Length, Mass & Time Unit Conversion Tables
Metric to Imperial Length Conversion
Length is the most commonly converted physical quantity. Key factors: 1 meter = 3.28084 feet = 39.3701 inches, 1 kilometer = 0.62137 miles, 1 inch = 2.54 cm (exact). The meter is defined by the speed of light: the distance light travels in 1/299,792,458 of a second. For speed-based conversions, see our km to mph converter.
Mass Unit Conversion Standards
The kilogram is the SI base unit of mass, defined by the Planck constant since 2019. Key conversions: 1 kg = 2.20462 lb, 1 lb = 453.592 g, 1 oz = 28.3495 g, 1 metric ton = 1000 kg = 2204.62 lb. Note: mass (kg) and weight (N) are different quantities — weight depends on gravitational acceleration.
Time Measurement Units
The second is the SI base unit of time, defined by cesium-133 atomic transitions. Common conversions: 1 hour = 3600 seconds, 1 day = 86,400 seconds. In engineering, milliseconds (ms), microseconds (µs), and nanoseconds (ns) are critical for electronics and signal processing.
Force, Energy & Pressure Conversion Formulas
Newton to Pound-Force Conversion
1 Newton = 0.22481 pound-force (lbf). 1 lbf = 4.44822 N. The newton is defined as the force needed to accelerate 1 kg at 1 m/s². In engineering, force conversions are essential for structural analysis, mechanical design, and torque calculations. For torque-specific conversions, visit our Nm to ft-lbs converter.
Joule to Calorie Conversion
1 joule = 0.239006 calories (thermochemical). 1 calorie = 4.184 joules (exact). 1 food Calorie (kcal) = 4,184 joules. The joule is the SI unit of energy: 1 J = 1 N·m = 1 W·s. For electrical energy conversions, see our watt hours converter.
Pascal to PSI Conversion
1 Pascal = 0.000145038 PSI. 1 PSI = 6,894.76 Pa. 1 atmosphere = 101,325 Pa = 14.696 PSI. Pressure conversions are critical in hydraulics, pneumatics, HVAC, and chemical engineering. The pascal is defined as one newton per square meter (N/m²).