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Scientific Energy, Work & Heat Converter

Convert between Joules (J), kilojoules (kJ), calories (cal), food kilocalories (kcal), British Thermal Units (BTU), therms, electron-volts (eV, keV, MeV), kilowatt-hours (kWh), and foot-pounds.

Fluid & Thermodynamic Laboratory Engine

11 Units Available

Sci Notation

Decimals:

SOURCE VALUE:J

CONVERTED RESULT:

0.1

Reference Presets:

Exact Mathematical Derivation:

1. Base SI value: 100 J × 1 = 100

2. Target unit factor: 1 kJ = 1000 SI base

3. Result: 100 / 1000 = 0.1 kJ

Complete Conversion TableClick copy on any row

Unit Name	Symbol	Converted Value
Joule	J	100
Kilojoule	kJ	0.1
Megajoule	MJ	0.0001
Thermochemical Calorie	cal	23.9006
Food Kilocalorie (Calorie)	kcal	0.0239
Kilowatt-hour	kWh	2.7778e-5
British Thermal Unit (ISO)	BTU	0.0948
US Therm (Natural Gas)	therm	9.4804e-7
Electron-volt	eV	6.2415e+20
Megaelectron-volt	MeV	6.2415e+14
Foot-pound force	ft·lbf	73.7562

What is Scientific Energy and Work?

Energy is the quantitative property transferred to a body to perform work or produce heat ($[M][L]^2[T]^{-2}$). The SI unit is the Joule ($1\,\text{J} = 1\,\text{N}\cdot\text{m} = 1\,\text{W}\cdot\text{s}$).

Atomic and quantum phenomena are quantified in electron-volts ($1\,\text{eV} \approx 1.602 \times 10^{-19}\,\text{J}$), electrical utilities bill energy in kilowatt-hours ($1\,\text{kWh} = 3.6\,\text{MJ}$), and thermal HVAC utilities use BTU and therms.

Formula & Step-by-Step Calculation

1\,\text{kWh} = 3.6 \times 10^6\,\text{J}, \quad 1\,\text{BTU} \approx 1,055.06\,\text{J}, \quad 1\,\text{eV} \approx 1.602176634 \times 10^{-19}\,\text{J}

Conversion constants bridging micro-scale quantum and macro-scale industrial energy.

Worked Step-by-Step Examples

Example 1

Convert 10 kilowatt-hours (kWh) to megajoules (MJ) and BTU.

Solution: 10 kWh = 36.0 MJ ≈ 34,121.4 BTU

• Multiply kWh by 3.6: 10 × 3.6 = 36.0 MJ = 36,000,000 J.

• Divide by 1,055.056 for BTU: 36,000,000 / 1,055.056 ≈ 34,121.4 BTU.

Common Real-World & Academic Use Cases

✓ Quantum physics and semiconductor band gap calculations in electron-volts (eV)
✓ Electric power grid utility billing, battery capacity storage, and solar generation in kWh
✓ HVAC heating load and natural gas combustion heating value in BTU and therms
✓ Nutritional dietary science and metabolic intake analysis in kcal

How to Use the Scientific Energy, Work & Heat Converter

Input Energy

Enter numeric energy magnitude.

Select Source Unit

Choose Joules, kWh, BTU, calories, or eV.

Review Multi-Scale Grid

See instantaneous conversions from subatomic eV to megawatt-hours.

Frequently Asked Questions

Q: What is the difference between a calorie and a food Calorie?

A dietary food Calorie (capital C or kcal) equals 1,000 physical thermochemical calories (1 kcal = 4,184 Joules).

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