Calculator Comparison

Electricity Cost Calculator vs HVAC Size Calculator

Not sure which calculator to use? Here's a side-by-side comparison of the Electricity Cost Calculator and HVAC Size Calculator to help you pick the right one for your needs.

Electricity Cost Calculator

Home & Real Estate

Calculate the cost of running any electrical device based on its wattage, daily usage hours, and your electricity rate.

What you enter

Wattage
Hours Used Per Day
Electricity Rate
Days Per Month

What you get

Monthly Cost(primary)
Daily Cost
Annual Cost
Monthly kWh Usage

Use Electricity Cost Calculator

HVAC Size Calculator

Home & Real Estate

Determine the correct HVAC system size in BTUs and tonnage based on your home's square footage, ceiling height, and climate zone.

What you enter

Home Square Footage
Ceiling Height
Climate Zone

What you get

BTUs Needed(primary)
Tonnage (Exact)
Recommended System Size

Use HVAC Size Calculator

Key Differences

Feature	Electricity Cost Calculator	HVAC Size Calculator
Category	Home & Real Estate	Home & Real Estate
Inputs	4 required fields	3 required fields
Outputs	4 results	3 results
Chart	No chart	No chart
FAQs	3 answered	3 answered

Input Comparison

Only in Electricity Cost Calculator

Wattage
Hours Used Per Day
Electricity Rate
Days Per Month

Only in HVAC Size Calculator

Home Square Footage
Ceiling Height
Climate Zone

Which Calculator Should You Use?

Use the Electricity Cost Calculator if you need to:

Calculate monthly cost
When you know your wattage and hours used per day

Use the HVAC Size Calculator if you need to:

Calculate btus needed
When you know your home square footage and ceiling height

Frequently Asked Questions

How do I calculate electricity cost for an appliance?

Multiply the appliance wattage by hours of use per day, divide by 1,000 to get kWh, then multiply by your electricity rate. For example, a 1,000W space heater running 8 hours at $0.12/kWh costs $0.96 per day or about $28.80 per month.

What is the average electricity rate in the US?

The average US residential electricity rate is approximately $0.12 to $0.16 per kWh as of 2025. Rates vary significantly by state, from $0.08/kWh in some southern states to over $0.30/kWh in Hawaii and parts of New England.

How many BTUs do I need per square foot?

A general rule is 20 BTUs per square foot for moderate climates. Hot climates may need 25-30 BTUs per square foot, while cold climates need 22-25 BTUs for heating. Ceiling height, insulation, and sun exposure also affect the calculation.

What is HVAC tonnage?

One ton of cooling capacity equals 12,000 BTUs per hour. A 2,000 square foot home in a moderate climate typically needs a 3 to 3.5 ton unit. Oversizing or undersizing an HVAC system reduces efficiency and comfort.

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Bottom Line

Choose the Electricity Cost Calculator if you need to calculate monthly cost. Use the HVAC Size Calculator if you need to calculate btus needed. Both calculators are free and require no sign-up.

Use Electricity Cost Calculator Use HVAC Size Calculator

Feature

Electricity Cost Calculator

HVAC Size Calculator