Electricity Cost Calculator
Estimate daily, monthly and annual energy use and electricity cost for an appliance.
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Free, practical calculators to estimate energy usage, renovation materials, and everyday household expenses.
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Energy & ElectricityEstimate electricity use and costs with your own rate and usage pattern.Home AppliancesCompare the energy used by appliances and household equipment.Renovation & MaterialsPlan quantities and early project budgets before requesting local quotes.Water & UtilitiesEstimate water use and related costs using a rate you provide.
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Air Conditioner Electricity Cost
Compare an air conditioner’s estimated running cost with and without a duty-cycle adjustment.
Open calculatorPaint Calculator
Estimate wall area and the amount of paint to buy after openings, coats and waste.
Open calculatorWater Usage Calculator
Estimate daily and monthly water use and its cost from a flow rate you provide.
Open calculatorFlooring Calculator
Estimate room coverage and the number of flooring packages to purchase.
Open calculatorPC Power Cost Calculator
Estimate a desktop computer’s electricity use from power, time and your local tariff.
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A clear estimate in three steps
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Enter your measurements or usage information.
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Adjust the relevant settings.
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Practical reading
Browse all guidesGuides for better home decisions
Original, practical explanations for estimating household energy, materials and renovation costs.
How to calculate monthly electricity usage
Estimate monthly household electricity use from appliance wattage and actual schedules, sum device estimates, and check the result against meter readings and billing dates. Learn what the kWh estimate includes and how to use your own electricity rate without mistaking it for a full bill.
Read guideHow much electricity does an air conditioner use?
Estimate air-conditioner electricity from electrical input and run time, compare full-use and assumed duty-cycle scenarios, and translate kWh into a cost using your own rate.
Read guideHow to calculate paint needed for a room
Estimate room paint from measured wall area, openings, coats, label coverage, and any stated waste allowance; then round up to available package sizes. Includes a practical example and checks for common sources of variation.
Read guideBuilt around clarity
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Results depend on your inputs and local conditions. Our calculators show their formulas and assumptions; verify important costs with a qualified local professional.
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Local providers and qualified professionals can verify important costs, measurements and project requirements.