Energy Converter

An energy converter translates how much work or heat is stored from one unit to another. This free tool handles joules (J), kilojoules (kJ), megajoules (MJ), watt-hours (Wh), kilowatt-hours (kWh), megawatt-hours (MWh), BTU, calories (cal/kcal), and electronvolts (eV) — for electricity bills, nutrition labels, HVAC specs, and physics homework.

Whether you need conversion of units of energy, units to measure energy, or practical energy conversion examples, pick From and To in the dropdowns. All conversion energy math runs locally — nothing is uploaded.

Many searches mix energy and power. This tool converts energy (total amount). Power (watts, kilowatts) is energy per unit time.

• 1 kilowatt to watt / convert watt into kilowatt — power scaling: 1 kW = 1,000 W (not handled here; use a power converter).
• 1 watt power sustained for one hour = 1 Wh of energy.
• Conversion of power to energy / energy to power conversion: multiply power (W) by time (hours) to get Wh, or divide energy by time to get watts.

Searches like watt to kilowatt hour calculator, watt kwh converter, or convert watts to kilowatt hours mean: energy (kWh) = power (kW) × time (h). Example: a 2 kW heater for 3 hours = 6 kWh. Enter 6 kWh here to convert to joules or BTU.

Horse power to kilowatt conversion calculator and electric power converter are power tools — 1 hp ≈ 745.7 W. This page converts the resulting energy once you know kWh or joules.

Electrical energy on utility bills is billed in kilowatt-hours (kWh). In India and some regions, one kWh is colloquially called one "unit" of electricity.

Kilowatt to unit conversion, 1 kilowatt to unit conversion, convert kilowatt to unit, kilowatt hour to unit converter, kilowatt into unit, and 1kw convert to unit: 1 kWh = 1 "unit" on many domestic meters. Convert unit to kilowatt / convert watts to units: divide energy (Wh) by 1,000 for kWh units.

1 kWh = 1,000 Wh = 3,600,000 J = 3.6 MJ

Convert megawatt hours to kilowatt hours: 1 MWh = 1,000 kWh. Megawatt to unit conversion: 1 MWh = 1,000 electricity units (where 1 unit = 1 kWh). Kw kwh converter and kilowatt hour to kilowatt confuse rate with total — kWh already includes the hour factor.

Kw hour calculator / ah to kwh calculator / ah to watt hour conversion / convert mah to watt hour: battery capacity (Ah × voltage = Wh) needs voltage — use Wh or kWh directly in this converter once you have watt-hours.

The SI unit is the joule (J). Key factors for energy conversion:

1 kWh = 3.6 × 10⁶ J · 1 BTU ≈ 1,055 J · 1 kcal = 4,184 J · 1 cal ≈ 4.184 J

British thermal unit conversion / btu unit conversion: 1 BTU ≈ 1.055 kJ. Btu to kilowatt often means BTU/h (a power rate for HVAC) — for energy, 1 BTU ≈ 0.000293 kWh. 100000 btu to kw as power ≈ 29.3 kW heating capacity; as energy, 100,000 BTU ≈ 29.3 kWh.

Btu to gj natural gas / btu to mmbtu calculator: 1 GJ = 10⁹ J ≈ 947,817 BTU · 1 MMBtu ≈ 1.055 GJ. Convert BTU → joules here, then scale to GJ. 3.5 kw to btu converter (HVAC) is typically BTU/h ↔ kW — power, not energy.

Food labels use kilocalories (kcal) — often written "Calories." 2,000 kcal/day ≈ 8,368 kJ ≈ 2.33 kWh of food energy (not all absorbed as usable work).

In atomic and particle physics, energy is quoted in electronvolts (eV). Searches include electron volt to joules, convert ev to j, joule to ev conversion, convert joule to ev, and joule ev conversion.

1 eV = 1.602176634 × 10⁻¹⁹ J  ·  1 J ≈ 6.242 × 10¹⁸ eV

That constant matches 1.60217663 × 10⁻¹⁹ joules per electronvolt (2019 SI definition). Example: 1 MeV = 10⁶ eV ≈ 1.602 × 10⁻¹³ J. Volts to electron volts conversion is different — eV is an energy unit (charge × voltage), not a voltage conversion.

Convert 1 joule into erg: 1 J = 10⁷ erg (CGS unit not in the dropdown — multiply joules by 10,000,000 mentally, or convert J → kJ here for SI work).

Useful energy conversion examples for quick checks:

• 1 kWh = 3,600,000 J = 3.6 MJ = 3,412 BTU
• 1 BTU ≈ 1.055 kJ ≈ 0.293 Wh
• 1 kcal ≈ 4.184 kJ ≈ 3.97 BTU
• 9 kWh ≈ 32.4 MJ (typical daily home use in many countries)
• 1 eV ≈ 1.602 × 10⁻¹⁹ J (single atomic-scale quantum)

2kw convert to watts is power (2,000 W). If that device runs 1 hour, it consumes 2 kWh — convert that here to joules or BTU.

This tool converts energy units — not the physical processes behind them. Searches like heat to electricity converter, turning heat into electricity, conversion of mechanical energy to electrical energy, mechanical energy to electrical energy, chemical energy into electrical energy, electrical energy into mechanical energy, electricity to heat conversion, coal to electricity energy conversion, or principles of energy conversion describe thermodynamics, generators, and power plants — not unit arithmetic.

Likewise: natural gas conversion calculator, gas to hydrogen conversion, coal to co2 conversion, and btu to scf natural gas involve fuel chemistry and volume–energy relationships beyond simple J ↔ BTU scaling. Once you have an energy value in BTU or kWh, this converter handles the unit switch.

Joule to kg uses E = mc² (mass–energy equivalence) — not a linear unit factor. Unit converter power belongs in a watts/horsepower tool. For pure energy power conversion between J, kWh, BTU, cal, and eV, this page is the right place.