Converted values (from {from})
| Unit | Value |
|---|
Energy / Work Converter
Convert energy and work units across SI, thermal, mechanical, and atomic contexts with clear full-table output and practical examples. For broader category navigation, explore Energy.
Convert energy and work units.
What Is Energy vs Work?
Energy is the capacity to do work. Work is energy transferred when a force causes displacement. In physics, both share the same dimension and the same SI unit: joule (J).
In practice, the naming changes by domain: electricity usage may be in Wh, thermal systems in BTU or therm, mechanical systems in ft·lbf, and microscopic physics in eV. This converter unifies those contexts in one place.
Why Multiple Unit Systems Exist
Different industries adopted units that fit their workflows, instruments, and historical standards. Engineers often use SI units, HVAC workflows rely on BTU/therm, and lab-scale physics frequently uses eV. A useful converter must bridge these systems without forcing manual factor lookup.
How This Converter Computes Results
The tool applies a base-unit method: convert input to joules first, then convert from joules to each target unit. This gives consistent values across the full output table and supports reliable step-by-step checking in examples.
Reference Factors Used
- $1\ \mathrm{Wh}=3600\ \mathrm{J}$
- $1\ \mathrm{kcal\ (th)}=4184\ \mathrm{J}$
- $1\ \mathrm{ft\cdot lbf}=1.3558179483\ \mathrm{J}$
- $1\ \mathrm{BTU\ (IT)}=1055.05585262\ \mathrm{J}$
- $1\ \mathrm{eV}=1.602176634\times 10^{-19}\ \mathrm{J}$
If your requirement is energy transfer rate per unit area (rather than total energy/work), use Energy Flux Converter.
Worked Examples
Example 1: Convert 500 Wh to Joules
Use this when you need to translate electricity-style usage into SI base energy.
Given: $$E=500\ \mathrm{Wh}$$ Reference factor: $$1\ \mathrm{Wh}=3600\ \mathrm{J}$$
Convert: $$E_{J}=500\times 3600$$
Final result: $$E_{J}=1{,}800{,}000\ \mathrm{J}$$
Example 2: Convert 10,000 J to kcal (th)
Use this when translating SI energy into a common thermal unit.
Given: $$E=10{,}000\ \mathrm{J}$$ Reference factor: $$1\ \mathrm{kcal\ (th)}=4184\ \mathrm{J}$$
Convert: $$E_{\mathrm{kcal(th)}}=\frac{10{,}000}{4184}$$
Final result: $$E_{\mathrm{kcal(th)}}=2.390057\ \mathrm{kcal\ (th)}$$
Example 3: Convert 2500 ft·lbf to Joules
Use this in mechanical work scenarios where you need SI equivalent energy.
Given: $$W=2500\ \mathrm{ft\cdot lbf}$$ Reference factor: $$1\ \mathrm{ft\cdot lbf}=1.3558179483\ \mathrm{J}$$
Convert: $$W_{J}=2500\times 1.3558179483$$
Final result: $$W_{J}=3389.544871\ \mathrm{J}$$
Example 4: Convert 2 therm (US) to MJ
Use this for utility-scale thermal values, then express them in megajoules.
Given: $$E=2\ \mathrm{therm(US)}$$ Reference factor: $$1\ \mathrm{therm(US)}=105{,}480{,}400\ \mathrm{J}$$
Convert to joules: $$E_{J}=2\times 105{,}480{,}400=210{,}960{,}800\ \mathrm{J}$$ Convert joules to megajoules: $$E_{MJ}=\frac{210{,}960{,}800}{10^6}$$
Final result: $$E_{MJ}=210.9608\ \mathrm{MJ}$$
Questions About the Energy / Work Converter
Clear answers on units, precision, and practical use.
Joule is the common SI base for energy, so routing all conversions through J gives consistent and reversible results across many unit systems.
They are close but not identical standards with slightly different factors. The converter keeps separate factors so technical calculations stay accurate.
Nutritional Calorie (Cal) corresponds to kilocalorie scale in food contexts, while small-calorie units (cal) are much smaller. The tool lists both explicitly.
Yes. It includes thermal units (BTU, therm), mechanical units (ft·lbf), and atomic units (eV, MeV), making it suitable across disciplines.
Very large or very small values are formatted scientifically to maintain readability and avoid long decimal strings while keeping significant precision.
Trusted by thousands of users every month. Fast, accurate and privacy-friendly tools.