Thermal Calculators — Unit Conversion
Heat and energy unit conversion: BTU and calories to joules, energy density, and entropy units. Note the food calorie is a kilocalorie, which is the single most common error in nutrition-to-physics conversions.
All Thermal & Energy Calculators
Calculate btuto joule converter with inputs, formulas, and instant results.
Calculate caloriesto joule converter with inputs, formulas, and instant results.
Calculate energy density converter with inputs, formulas, and instant results.
Calculate entropy converter with inputs, formulas, and instant results.
Calculate heat rate converter with inputs, formulas, and instant results.
Calculate joule to calorie converter with inputs, formulas, and instant results.
Calculate power to energy converter with inputs, formulas, and instant results.
Calculate specific heat converter with inputs, formulas, and instant results.
Calculate temperature conversion with inputs, formulas, and instant results.
Calculate thermal conductivity converter with inputs, formulas, and instant results.
Calculate wattsto horsepower converter with inputs, formulas, and instant results.
About Thermal & Energy Calculators
Heat and energy unit conversion: BTU and calories to joules, energy density, and entropy units. Note the food calorie is a kilocalorie, which is the single most common error in nutrition-to-physics conversions.
Whether you need to solve a one-time problem or verify your own calculations, these free tools cover the most common thermal & energy scenarios. All results are computed in your browser — no data is sent to any server.
What You Can Calculate
This section includes 11 tools: BTU to Joule Converter, Caloriesto Joule Converter, Energy Density Converter, Entropy Converter, Heat Rate Converter, Joule to Calorie Converter, Power to Energy Converter, Specific Heat Converter, and 3 more. Each calculator is free to use with no signup required.