Calculator Comparison

Electricity Cost Calculator vs Rent Affordability Calculator

Not sure which calculator to use? Here's a side-by-side comparison of the Electricity Cost Calculator and Rent Affordability 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

Rent Affordability Calculator

Home & Real Estate

Calculate how much rent you can afford based on your monthly income, existing debts, and the recommended 30% income rule.

What you enter

Gross Monthly Income
Monthly Debt Payments

What you get

Max Rent (30% Rule)(primary)
Max Rent (After Debts)
Remaining After Rent

Use Rent Affordability Calculator

Key Differences

Feature	Electricity Cost Calculator	Rent Affordability Calculator
Category	Home & Real Estate	Home & Real Estate
Inputs	4 required fields	2 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 Rent Affordability Calculator

Gross Monthly Income
Monthly Debt Payments
Other Monthly Expenses

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 Rent Affordability Calculator if you need to:

Calculate max rent (30% rule)
When you know your gross monthly income and monthly debt payments

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.

What is the 30% rule for rent?

The 30% rule states you should spend no more than 30% of your gross monthly income on rent. For a $5,000 monthly income, that is $1,500 maximum for rent.

How do landlords calculate if you can afford rent?

Most landlords require your gross income to be at least 3 times the monthly rent (the 3x rule). Some also check your credit score and debt-to-income ratio.

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Bottom Line

Choose the Electricity Cost Calculator if you need to calculate monthly cost. Use the Rent Affordability Calculator if you need to calculate max rent (30% rule). Both calculators are free and require no sign-up.

Use Electricity Cost Calculator Use Rent Affordability Calculator

Feature

Electricity Cost Calculator

Rent Affordability Calculator