Energy Converter

Calories measure food energy (1 calorie = 4.184 joules), kilojoules are metric energy units (1 kJ = 1000 joules), and BTUs measure heating/cooling energy (1 BTU = 1055 joules). Food labels use both calories and kilojoules, while HVAC systems use BTUs in the US and watts/joules internationally.

Kilowatt-hours (kWh) measure electrical energy consumption. Key conversions: 1 kWh = 3.6 million joules = 3,412 BTUs = 860,421 calories. Your electricity bill shows kWh usage, making this conversion essential for understanding energy costs and comparing appliance efficiency internationally.

Food labeling varies by regulation: the US primarily uses calories, while many countries use both calories and kilojoules, and some use only kilojoules. The conversion is: 1 calorie = 4.184 kilojoules. This dual labeling helps consumers understand nutritional energy content regardless of their familiar system.

Solar energy uses kilowatt-hours for production and watts for capacity. Key conversions help compare systems globally: watts to kilowatts (÷1000), daily kWh production calculations, and energy cost comparisons. Understanding these units is crucial for solar investment decisions and energy independence planning.

HVAC systems use BTUs in the US and watts/kilowatts internationally. Conversion: 1 BTU/hour = 0.293 watts. This affects air conditioner sizing, heating calculations, and energy efficiency comparisons. Proper conversion ensures adequate heating/cooling capacity for your space.

Fitness tracking uses calories burned vs. consumed. Key conversions: food calories to exercise equivalents, kilojoules to calories for international nutrition labels, and metabolic energy calculations. Understanding these helps with diet planning, exercise goals, and international fitness app compatibility.