Calculator Suite

Energy Converter

Convert between joules, calories, BTU, kilowatt-hours and other energy units

Energy Converter
Convert between different energy units with precision

Unit to convert from

Unit to convert to

Enter the value you want to convert

2000 J → kJ

Click "Convert" for detailed results and analysis

Popular Energy Converter Conversions

2000 kcal to kJ8000 kJ to kcal10 kWh to J1000 BTU to kJ1000 cal to J500 Wh to J5000 kJ to BTU1 kcal to Wh

Quick Presets

2000 kcal to kJ10 kWh to J
Energy Converter Formulas
Energy conversions using thermodynamic equivalents

Base Unit Method

Vtarget=Vinput×FinputFtargetV_{target} = V_{input} \times \frac{F_{input}}{F_{target}}

VtargetV_{target} = Value in target unit

VinputV_{input} = Value in input unit

FinputF_{input} = Conversion factor to base

FtargetF_{target} = Conversion factor from base

Category-Specific Formula

1 kcal=4184 J=1.163 Wh1 \text{ kcal} = 4184 \text{ J} = 1.163 \text{ Wh}
Understanding Energy Converter

Forms of Energy

Energy comes in many forms: kinetic (motion), potential (position), thermal (heat), chemical (bonds), electrical, and nuclear. All can be measured in joules, but specialized units exist for convenience.

Food Energy

Food calories (kcal) measure energy your body can extract from food. One food calorie equals 1000 scientific calories and provides about 4184 joules of energy.

Electrical Energy

Kilowatt-hours (kWh) measure electrical energy consumption. Your electricity bill charges per kWh used. One kWh equals 3.6 million joules of energy.

Heating and Cooling

BTU (British Thermal Unit) measures heating and cooling capacity. Air conditioners and heaters are often rated in BTU/hour, indicating their energy consumption rate.

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TL;DR — Energy Units Explained

The Joule (J) is the SI unit of energy. Key conversions: 1 food Calorie (kcal) = 4,184 J, 1 kWh = 3.6 million J, and 1 BTU = 1,055 J. Your electricity is billed in kWh, food labels show kcal, and HVAC systems use BTU ratings.

How to Use This Calculator: Step-by-Step
1

Select Energy Units

Choose the "From" unit (e.g., Calories) and "To" unit (e.g., Joules).

2

Enter Energy Value

Input the energy amount you want to convert.

3

Get Instant Results

View the converted value plus alternative unit comparisons.

⚡ Example: Daily Food Energy to kWh

A 2,000 Calorie diet contains this much energy:

Input

2,000 kcal

In Joules

8,368,000 J

In kWh

2.32 kWh

Fun Fact

~$0.30 of electricity

⚠️ Assumptions & Limitations

What This Tool Assumes:

  • • Standard thermodynamic definitions
  • • 1 food Calorie = 1 kilocalorie (kcal)
  • • International Table calorie (4.1868 J)
  • • ISO BTU definition (1055.06 J)

What It Does NOT Include:

  • • Metabolic efficiency (body ~25% efficient)
  • • Power (energy/time) calculations
  • • Mass-energy equivalence (E=mc²)
  • • Regional BTU variations
Frequently Asked Questions

Joule vs Calorie?

1 food Calorie (kcal) = 4184 Joules. The small 'calorie' (cal) = 4.184 J. Food labels use kcal but write 'Calories'.

What is a kWh?

Kilowatt-hour = energy to run 1000 watts for 1 hour = 3.6 million Joules. Your electricity bill charges per kWh.

How many calories in a kWh?

1 kWh = 860 kcal. A 2000 kcal diet = ~2.3 kWh of food energy daily.

What is a BTU?

British Thermal Unit = energy to heat 1 lb of water by 1°F = 1055 Joules. Used for HVAC ratings.

Joules vs Watts?

Joules = energy (amount). Watts = power (rate). 1 Watt = 1 Joule per second.

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