Calculator library

Home cost calculators with formulas and examples

Each calculator has a dedicated explanation page covering when to use it, the formula, input notes, examples, common mistakes, and accuracy limits. Use the calculator result as a planning estimate, then verify important costs with your bill, provider, supplier, or qualified professional.

Open all calculators How the calculators work

Electricity

Electric Bill

Estimate monthly electricity cost from appliance watts, daily hours, billing days, and your local kWh rate.

Electricity

Appliance Comparison

Compare old and new appliance electricity cost using watts, daily hours, rate, and billing days.

Electricity

LED Savings

Estimate monthly and yearly savings from replacing older bulbs with LED bulbs.

Electricity

Ceiling Fan

Estimate the monthly cost of running a ceiling fan from watts, daily hours, days, and kWh rate.

Electricity

Appliance Wattage

Calculate running cost for one or more appliances from wattage, quantity, daily hours, monthly days, and kWh rate.

Air Conditioning

AC BTU

Estimate the cooling capacity a room may need using room size, sunlight, people, and heat sources.

Air Conditioning

AC Running Cost

Estimate monthly air conditioner running cost using watts, hours, duty cycle, days, and electricity rate.

Paint

Estimate paint gallons from room dimensions, wall height, coat count, and coverage per gallon.

Paint

Paint Coverage

Convert known wall area, coats, coverage rate, and waste percentage into estimated gallons of paint.

Flooring

Calculate room flooring area and add a waste factor before buying boards, tile, vinyl, laminate, or carpet.

Flooring

Flooring Boxes

Estimate how many boxes of flooring to buy from total area, waste percentage, and square feet per box.

Rent

Estimate a safer monthly rent limit using income, target rent percentage, and other monthly housing costs.

Rent

Rent Ratio

Check what percentage of monthly income is taken by rent plus utilities.

Utilities

Water Bill

Estimate water cost from daily gallons, bill days, rate per thousand gallons, and fixed monthly fees.

Utilities

Gas Bill

Estimate natural gas cost from daily therms, bill days, rate per therm, and fixed charges.

Budgeting

Utility Budget

Combine electricity, water, gas, internet, trash, and other monthly services into one utility budget.

Budgeting

Internet + Utilities

Add internet, electricity, water, gas, phone, streaming, and other recurring home services into one monthly number.

Moving

Move-In Cost

Estimate cash needed before moving by adding rent, deposits, fees, movers, furniture, setup costs, and emergency buffer.

Moving

Moving Cost

Estimate moving day costs from truck rental, movers, supplies, fuel, cleaning, and a buffer.

Maintenance

Maintenance Budget

Estimate a monthly and yearly reserve for home maintenance using home value, annual percentage, and extra monthly savings.

Rooms

Room Area

Calculate room area and perimeter for flooring, rugs, furniture planning, and paint estimates.