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Unit converters for energy and work (J, kJ, kcal, BTU, kWh), temperature (°C, °F, K, °R) and refrigeration capacity (W, BTU/h, RT). Covers thermodynamics, HVAC and thermal engineering applications.
Enter a temperature in any of the four scales and the other three convert immediately. Celsius (°C) and Fahrenheit (°F) are everyday scales; Kelvin (K) is the SI thermodynamic standard; Rankine (°R) appears in US engineering thermodynamics. Note: temperature conversion uses affine formulas, not simple ratios.
Enter an energy quantity in one unit and all five equivalents appear immediately. Bridges the SI standard joule (J), electrical billing kilowatt-hour (kWh), nutritional calorie (cal), US thermal BTU and mechanical foot-pound-force (ft·lbf) — the units most commonly mixed in energy-audit and heat-transfer calculations.
Type a power value in one field and all five update at once. Converts between the SI watt (W), kilowatt (kW), US mechanical horsepower (hp), metric horsepower (PS) and BTU per hour (BTU/h). Covers motors, HVAC equipment, engines and electrical appliances.
Enter a refrigeration capacity in RT, kW or kcal/h and the other two refresh instantly. Refrigeration ton (RT) is the legacy North American standard (≈ 3.517 kW); kW is the modern SI metric; kcal/h is still widely used in Asian markets. Essential for equipment sizing and international tender documents.
Input thermal conductivity in W/m·K or BTU·in/(h·ft²·°F) and the other converts instantly; likewise enter a thermal expansion coefficient in 1/°C or 1/°F. These properties appear in every heat-transfer and structural-analysis calculation involving mixed SI/imperial material datasheets.
Typical engineering problems solved with Energy & Refrigeration calculators: