Conversion family

Energy conversion calculators

Use energy conversions for power bills, heating, cooling, nutrition, and engineering comparisons.

These 44 guides cover the most commonly searched unit pairs. Each page includes the exact relationship, worked values, and a reverse-conversion path.

BTU to Food Calories Converterbtu to cal BTU to Joules Converterbtu to j BTU to Kilojoules Converterbtu to kj BTU to kWh Converterbtu to kwh BTU to Small Calories Converterbtu to small cal BTU to Watt Hours Converterbtu to wh Calories to Kilojoules Convertercal to kj Food Calories to BTU Convertercal to btu Food Calories to Foot Pounds Convertercal to ft lb Food Calories to Joules Convertercal to j Food Calories to Kilowatt Hours Convertercal to kwh Food Calories to Small Calories Convertercal to small cal Food Calories to Watt Hours Convertercal to wh Joules to BTU Converterj to btu Joules to Food Calories Converterj to cal Joules to Kilojoules Converterj to kj Joules to kWh Converterj to kwh Joules to Small Calories Converterj to small cal Joules to Watt Hours Converterj to wh Kilojoules to BTU Converterkj to btu Kilojoules to Food Calories Converterkj to cal Kilojoules to Joules Converterkj to j Kilojoules to Kilowatt Hours Converterkj to kwh Kilojoules to Small Calories Converterkj to small cal Kilojoules to Watt Hours Converterkj to wh Kilowatt Hours to BTU Converterkwh to btu Kilowatt Hours to Food Calories Converterkwh to cal Kilowatt Hours to Kilojoules Converterkwh to kj Kilowatt Hours to Small Calories Converterkwh to small cal Kilowatt Hours to Watt Hours Converterkwh to wh kWh to Joules Converterkwh to j Small Calories to BTU Convertersmall cal to btu Small Calories to Food Calories Convertersmall cal to cal Small Calories to Joules Convertersmall cal to j Small Calories to Kilojoules Convertersmall cal to kj Small Calories to Kilowatt Hours Convertersmall cal to kwh Small Calories to Watt Hours Convertersmall cal to wh Therms to BTU Convertertherm to btu Watt Hours to BTU Converterwh to btu Watt Hours to Food Calories Converterwh to cal Watt Hours to Joules Converterwh to j Watt Hours to Kilojoules Converterwh to kj Watt Hours to Kilowatt Hours Converterwh to kwh Watt Hours to Small Calories Converterwh to small cal

How to use energy conversions

Choose the guide whose source unit matches the value you already have and whose target unit matches the format you need. Enter the value without rounding it first, review the displayed relationship, and round only the final answer to the precision your task requires. Popular starting points in this family include BTU to Food Calories, BTU to Joules, BTU to Kilojoules.

Energy units are used in several fields and measurement systems. Confirm the definition and symbol shown on the source document or device before choosing a conversion. Unit symbols can be case-sensitive, and similarly named units may belong to different systems, so check the label as well as the abbreviation before relying on the result.

Keep the original value at full precision until the final step.
Confirm the unit symbol, system, and measurement type.
Use the reverse guide to check that the result returns to the starting value.

Measurement context

Confirm the measurement type before converting

Exact unit factors work best when the source and target units describe the same kind of measurement and the source convention is clear.

Check the unit symbol, full unit name, and measurement family before entering a value.
Keep the original number unrounded until the final result.
Use the reverse guide or a known reference value to sanity-check important results.