Energy Converters
Browse our comprehensive collection of energy converters for joules, calories, BTUs, watt-hours, electronvolts, therms, and more. Free online tools for physics, engineering, and everyday use.
Joules to Foot-pounds
Convert joules (J) to foot-pounds (ft·lb) for mechanical work and torque.
mechanicalFoot-pounds to Joules
Convert foot-pounds (ft·lb) to joules (J) with step-by-step formula.
mechanicalJoules to Erg
Convert joules (J) to ergs (cgs unit) for scientific calculations.
mechanicalErg to Joules
Convert ergs to joules with detailed conversion factor.
mechanicalNewton-meters to Joules
Convert newton-meters (N·m) to joules (J) for torque and work.
mechanicalJoules to Newton-meters
Convert joules to newton-meters with exact equivalence.
mechanicalKilopond-meters to Joules
Convert kilopond-meters (kgf·m) to joules for engineering.
mechanicalJoules to Kilopond-meters
Convert joules to kilopond-meters (kgf·m) with formula.
mechanicalCalories to Joules
Convert calories (cal) to joules (J) with thermochemical and nutritional calories.
thermalJoules to Calories
Convert joules to calories (cal) with step-by-step division.
thermalBTU to Joules
Convert British Thermal Units (BTU) to joules (J) for heating and cooling.
thermalJoules to BTU
Convert joules (J) to British Thermal Units (BTU) with formula.
thermalKilocalories to Kilojoules
Convert kilocalories (kcal) to kilojoules (kJ) for food energy.
thermalKilojoules to Kilocalories
Convert kilojoules (kJ) to kilocalories (kcal) with nutrition labeling.
thermalTherms to BTU
Convert therms (natural gas) to BTU with exact factor (1 therm = 100,000 BTU).
thermalBTU to Therms
Convert BTU to therms for natural gas consumption.
thermalWatt-hours to Joules
Convert watt-hours (Wh) to joules (J) for electrical work.
electricalJoules to Watt-hours
Convert joules (J) to watt-hours (Wh) with division by 3600.
electricalKilowatt-hours to Megajoules
Convert kWh to MJ for large-scale energy use.
electricalMegajoules to Kilowatt-hours
Convert MJ to kWh with detailed factor (1 kWh = 3.6 MJ).
electricalWatt-hours to Kilowatt-hours
Convert Wh to kWh for electricity billing.
electricalKilowatt-hours to Watt-hours
Convert kWh to Wh with multiplication by 1000.
electricalMegawatt-hours to Kilowatt-hours
Convert MWh to kWh for large power plant output.
electricalKilowatt-hours to Megawatt-hours
Convert kWh to MWh with division by 1000.
electricalElectronvolts to Joules
Convert electronvolts (eV) to joules (J) for atomic-scale energy.
chemicalJoules to Electronvolts
Convert joules (J) to electronvolts (eV) with division by elementary charge.
chemicalKilojoules per Mole to eV
Convert kJ/mol to eV per molecule for chemical reactions.
chemicaleV to Kilojoules per Mole
Convert eV per molecule to kJ/mol using Avogadro's constant.
chemicalHartree to Electronvolts
Convert Hartree (atomic unit) to eV for quantum chemistry.
chemicalElectronvolts to Hartree
Convert eV to Hartree with exact conversion factor.
chemicalRydberg to Electronvolts
Convert Rydberg energy (Ry) to electronvolts (eV).
chemicalElectronvolts to Rydberg
Convert eV to Rydberg (Ry) for atomic physics.
chemicalTherms to Joules
Convert therms (natural gas) to joules (J) with exact factor.
naturalgasJoules to Therms
Convert joules to therms for natural gas billing.
naturalgasCCF (Hundred Cubic Feet) to Therms
Convert CCF to therms (1 CCF ≈ 1.037 therms).
naturalgasTherms to CCF
Convert therms to CCF for natural gas volume.
naturalgasMcF (Thousand Cubic Feet) to Therms
Convert McF to therms for commercial gas.
naturalgasTherms to McF
Convert therms to McF with division by 1.037.
naturalgasNatural Gas Cost Calculator
Calculate cost of natural gas based on therms and price per therm.
naturalgasBTU to Cubic Feet (Natural Gas)
Convert BTU to cubic feet of natural gas using calorific value.
naturalgasBarrels of Oil Equivalent (BOE) to Joules
Convert BOE to joules (J) using standard energy content.
petroleumJoules to BOE
Convert joules to barrels of oil equivalent (BOE).
petroleumGallons of Gasoline to Joules
Convert US gallons of gasoline to joules using energy density.
petroleumJoules to Gallons of Gasoline
Convert joules to gallons of gasoline equivalent.
petroleumBOE to MWh
Convert BOE to megawatt-hours for energy comparison.
petroleumMWh to BOE
Convert MWh to barrels of oil equivalent.
petroleumTonnes of Oil Equivalent (TOE) to Joules
Convert TOE to joules (J) for large energy quantities.
petroleumJoules to TOE
Convert joules to tonnes of oil equivalent.
petroleumMega-electronvolts to Joules
Convert MeV to J for nuclear reactions and particle physics.
nuclearJoules to MeV
Convert J to MeV (1 MeV = 1.602e-13 J).
nuclearMass-Energy Equivalence (E=mc²)
Calculate energy from mass using Einstein's equation.
nuclearNuclear Binding Energy per Nucleon
Calculate binding energy per nucleon from mass defect.
nuclearCurie to Becquerel (Decay Energy)
Convert radioactivity units with energy emission estimate.
nuclearFission Energy Released
Calculate energy released in nuclear fission (per atom or per kg).
nuclearFusion Energy Released
Calculate energy released in nuclear fusion (D-T, etc.).
nuclearRadiation Dose to Energy
Convert radiation absorbed dose (Gy) to energy (J/kg).
nuclearUniversal Energy Converter
Convert between all major energy units: J, cal, BTU, Wh, eV, therm, etc.
universalJoules to Kilowatt-hours
Convert J to kWh for electrical energy billing.
universalKilowatt-hours to Joules
Convert kWh to J with multiplication by 3.6e6.
universalCalories to Kilowatt-hours
Convert calories (thermochemical) to kWh.
universalBTU to Kilowatt-hours
Convert BTU to kWh for heating and cooling systems.
universalTherms to Kilowatt-hours
Convert therms to kWh (1 therm ≈ 29.3 kWh).
universalEnergy Unit Comparison Tool
Compare any two energy units side-by-side with conversion factors.
universalEnergy Cost Estimator
Estimate energy cost from consumption and price per unit.
universalWhat Are Energy Converters?
Our Energy Converters collection provides a comprehensive suite of tools for converting between different energy units and quantifying energy in various forms. Whether you're studying physics, working in engineering, managing energy consumption, or simply curious about energy equivalence, these converters deliver accurate results with clear explanations.
From mechanical and thermal energy to electrical, chemical, and nuclear forms, our tools cover all major energy units used in science, industry, and daily life.
How to Use This Directory
- Search: Type a keyword into the search bar to find specific converters by name or description.
- Filter by Category: Use the dropdown to narrow down to a specific energy type — each option shows the number of tools available.
- Click to Use: Each card links directly to the converter. Click on any card to start your energy conversion instantly.
- Explore Category Pages: Use the "Explore More Conversion Calculators" section to access dedicated pages for other unit types.
Why Use Our Energy Converters?
- Comprehensive Coverage: Covers joules, calories, BTUs, watt-hours, electronvolts, therms, BOE, and many more.
- Accurate & Reliable: Uses exact conversion factors based on international standards.
- Free & Accessible: No registration, no fees — use any tool instantly on any device.
- Educational: Many tools show the conversion formula, helping you understand the relationships.
- Professional & Personal Use: Designed for students, engineers, energy analysts, and consumers.
❓ Energy Converters FAQ
What types of energy conversions can I perform?
You can convert between mechanical energy units (joules, foot-pounds, ergs), thermal units (calories, BTUs, therms), electrical units (watt-hours, kilowatt-hours, megawatt-hours), chemical/atomic units (electronvolts, Hartree), natural gas units (therms, CCF), petroleum units (BOE, gallons of gasoline), and nuclear energy (MeV, fission/fusion).
How do I convert joules to calories?
Use our Joules to Calories converter. Enter the value in joules, and the tool will divide by 4.184 to give calories (thermochemical) with detailed steps.
What is the difference between a therm and a BTU?
A therm is a unit of heat energy equal to 100,000 BTUs (British Thermal Units). It's commonly used for natural gas billing. Our converters handle both.
How do I convert kilowatt-hours to joules?
Use our Kilowatt-hours to Joules converter. Multiply kWh by 3,600,000 (since 1 kWh = 3.6 × 10⁶ J) with step-by-step formula.
What is a barrel of oil equivalent (BOE)?
BOE is a unit of energy based on the approximate energy released by burning one barrel of crude oil (about 5.8 million BTU or 6.12 GJ). Our converters handle BOE conversions.
How do I convert electronvolts to joules?
Use our Electronvolts to Joules converter. Multiply eV by 1.602176634 × 10⁻¹⁹ to get joules, with detailed explanation.
Can I estimate energy cost using these calculators?
Yes, our Energy Cost Estimator tool lets you input consumption and price per unit to calculate total cost.
Are these converters accurate for engineering and scientific work?
Yes, our converters use exact conversion factors from NIST and other authoritative sources, making them suitable for professional use.
How often are new energy converters added?
We regularly add new converters based on user requests and emerging energy measurement needs. If you have a suggestion, please contact us.
Can I convert between different energy units for renewable energy?
Yes, our universal converters cover solar, wind, and hydro energy units, and we plan to add more specific renewable energy tools in the future.