Most used tools
Popular calculators
Start with the calculator, then read the matching page for formula notes, examples, mistakes, and safety limits.
Electric Bill
Estimate monthly electricity cost from appliance watts, daily hours, billing days, and your local kWh rate.
Air ConditioningAC BTU
Estimate the cooling capacity a room may need using room size, sunlight, people, and heat sources.
PaintPaint
Estimate paint gallons from room dimensions, wall height, coat count, and coverage per gallon.
FlooringFlooring
Calculate room flooring area and add a waste factor before buying boards, tile, vinyl, laminate, or carpet.
RentRent
Estimate a safer monthly rent limit using income, target rent percentage, and other monthly housing costs.
UtilitiesWater Bill
Estimate water cost from daily gallons, bill days, rate per thousand gallons, and fixed monthly fees.
Use estimates properly
Better inputs. Safer decisions.
Use real sources
Pull rates from bills, coverage from product labels, measurements from the room, and fees from lease terms or provider quotes.
Run scenarios
Compare low, normal, and high estimates before buying materials, signing a lease, upgrading appliances, or booking movers.
Original planning content
Featured guides
How to Calculate Monthly Electricity Cost for Any Appliance
Learn the kWh formula, run appliance examples, and understand why usage hours and local rates change monthly electric bills.
Electric Bill Calculator Guide: Inputs, Formula, and Real Examples
A practical walkthrough for using the electric bill calculator with watts, hours, days, and electricity rate.
AC Running Cost Guide: How Much Does an Air Conditioner Cost to Run?
Understand how AC running cost changes with wattage, duty cycle, thermostat setting, insulation, climate, and daily usage.