Calculator Comparison

Energy Converter vs Power Converter

Not sure which calculator to use? Here's a side-by-side comparison of the Energy Converter and Power Converter to help you pick the right one for your needs.

Energy Converter

Unit Conversions

Convert between common energy units including joules, calories, kilocalories, BTU, and kilowatt-hours.

What you enter

Energy Value
From Unit

What you get

Joules(primary)
Calories
Kilocalories
BTU
Kilowatt-hours

Use Energy Converter

Power Converter

Unit Conversions

Convert between common power units including watts, kilowatts, horsepower, and BTU per hour.

What you enter

Power Value
From Unit

What you get

Watts(primary)
Kilowatts
Horsepower
BTU per Hour

Use Power Converter

Key Differences

Feature	Energy Converter	Power Converter
Category	Unit Conversions	Unit Conversions
Inputs	2 required fields	2 required fields
Outputs	5 results	4 results
Chart	No chart	No chart
FAQs	3 answered	3 answered

Input Comparison

Shared Inputs

From Unit

Only in Energy Converter

Energy Value

Only in Power Converter

Power Value

Which Calculator Should You Use?

Use the Energy Converter if you need to:

Calculate joules
When you know your energy value and from unit

Use the Power Converter if you need to:

Calculate watts
When you know your power value and from unit

Frequently Asked Questions

What is the difference between a calorie and a Calorie?

A lowercase calorie (cal) is the energy to raise 1 gram of water by 1°C. An uppercase Calorie (Cal, or kilocalorie) is 1,000 calories and is what food labels use. When a food label says 200 Calories, it means 200 kilocalories.

How much energy does a kWh represent?

One kilowatt-hour (kWh) is 3.6 million joules. It is the energy consumed by a 1,000-watt appliance running for one hour. The average US household uses about 30 kWh per day.

How many watts are in one horsepower?

One mechanical horsepower is approximately 745.7 watts (or 0.7457 kilowatts). This is the standard conversion used for engines and motors.

What is the difference between watts and kilowatts?

A kilowatt (kW) is 1,000 watts. Watts measure the rate of energy transfer. A 60-watt light bulb uses 60 joules of energy per second. Kilowatts are used for larger appliances and industrial equipment.

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Bottom Line

Choose the Energy Converter if you need to calculate joules. Use the Power Converter if you need to calculate watts. Both calculators are free and require no sign-up.

Use Energy Converter Use Power Converter

Feature

Energy Converter

Power Converter