# Watt & Home > Understand appliance electricity costs using your own tariff, compare running costs and make sense of energy labels. Watt & Home is built and run by the Watt & Home Team in the USA as an independent project, with no company or separate editorial team. The content is in English and distinguishes US, Great Britain, Northern Ireland and EU label contexts. Calculations are informational estimates. Keep the source model, unit, capacity, programme and energy boundary with a quoted figure. Declared manufacturer or registry values are not independent measurements by this website. Tariffs, routines and prices are illustrative unless explicitly identified; dated listing observations are not live retail quotes. Currency selection does not convert amounts. Payback periods are scenarios, not service-life forecasts. Published research measurements identify the external observer organizations and report. Reported task averages and modelled annual quantities are distinguished; no original Watt & Home appliance measurements are claimed. Guide update dates and source check dates describe different reviews. Original source links and calculation limits are on the HTML pages. This optional directory describes the website; it is not a crawler permission or ranking mechanism. ## Start here - [Find the right appliance-cost calculator](https://wattandhome.com/start/): Choose your goal, appliance, label market and available energy input to find a suitable running-cost, comparison or household calculator. - [Appliance electricity measurement journal](https://wattandhome.com/measurement-journal/): Record complete-day or completed-cycle kWh readings, retain their conditions, export device-local observations and transfer samples into appliance-cost calculators. - [Calculation methodology](https://wattandhome.com/methodology/): Formulas, precision, scope and comparison boundaries. - [Documented appliance examples](https://wattandhome.com/appliance-examples/): Model declarations with market, capacity, programme, source version and calculator links. - [About Watt & Home](https://wattandhome.com/about/): The project and its publisher in the USA, with the calculator disclaimer. - [Editorial and source policy](https://wattandhome.com/editorial-policy/): Source register, check dates, AI-assisted preparation, corrections and evidence boundaries. ## Calculators - [Fridge running-cost calculator](https://wattandhome.com/calculators/fridge-running-cost/): Convert the annual electricity consumption on a fridge or freezer label into a cost using your own tariff. - [Washing-machine running-cost calculator](https://wattandhome.com/calculators/washing-machine-running-cost/): Turn a stated cycle-energy figure into electricity cost per wash and an estimate for your laundry routine. - [Tumble-dryer running-cost calculator](https://wattandhome.com/calculators/tumble-dryer-running-cost/): Estimate electricity costs using the energy figure and measurement basis stated for your dryer. - [Dishwasher running-cost calculator](https://wattandhome.com/calculators/dishwasher-running-cost/): Calculate the electricity cost of a stated dishwasher cycle and estimate the cost of your weekly usage. - [Appliance cost comparison](https://wattandhome.com/calculators/appliance-comparison/): Compare two appliances using compatible consumption figures, your weekly usage, purchase prices and a chosen comparison period. - [Appliance replacement-payback calculator](https://wattandhome.com/calculators/replacement-payback/): Estimate whether electricity savings recover the net cost of replacing a working appliance, using your own consumption, tariff and costs. - [Electricity cost calculator: watts and hours](https://wattandhome.com/calculators/electricity-cost/): Calculate electricity cost from electrical input watts or kilowatts and daily use time, or use measured kWh over complete days with your own tariff. - [Electric-heater running-cost calculator](https://wattandhome.com/calculators/electric-heater-running-cost/): Estimate electric space-heater cost per hour, use day and chosen period using input power and time, or a complete-day energy measurement. - [Dehumidifier running-cost calculator](https://wattandhome.com/calculators/dehumidifier-running-cost/): Estimate dehumidifier electricity costs using electrical input and use time, or measured daily energy that includes compressor or humidistat cycling. - [Air-conditioner running-cost calculator](https://wattandhome.com/calculators/air-conditioner-running-cost/): Calculate air-conditioner electricity cost for your cooling season from electrical input and time, measured kWh, or a stated annual label figure. - [Air fryer vs oven electricity-cost calculator](https://wattandhome.com/calculators/air-fryer-vs-oven-cost/): Compare electricity cost for the same meal in an air fryer and electric oven, including batches and preheating or measured whole-meal energy. - [Household appliance-cost planner](https://wattandhome.com/calculators/household-appliance-cost-planner/): Build an annual electricity budget for several appliances using label energy, cycles, electrical input or completed-day measurements. - [Time-of-use and electricity-tariff comparison](https://wattandhome.com/calculators/time-of-use-tariff-comparison/): Compare two electricity tariffs using the same annual kWh, your off-peak share and separate daily fixed charges, then explore shifting usage. - [Guided appliance energy-label reader](https://wattandhome.com/calculators/energy-label-reader/): Choose your appliance and label market, identify the energy figure and its units, and carry your manually entered values into a running-cost calculator. - [What changes your appliance cost?](https://wattandhome.com/calculators/appliance-cost-scenarios/): Compare three sets of assumptions for electricity use, tariffs and replacement prices, and see how annual cost or simple replacement payback changes. ## Practical guides - [kW and kWh: the difference that matters](https://wattandhome.com/guides/kw-vs-kwh/): general context. Understand power, energy and running costs, and choose the right figure for an appliance cost calculation. - [Electricity price per kWh: which bill rate to use](https://wattandhome.com/guides/find-electricity-unit-rate/): general context. Find your electricity unit rate, combine applicable supply and delivery charges, and separate fixed fees from appliance running costs. - [Pence, cents and price per kWh: avoiding a 100-fold error](https://wattandhome.com/guides/pence-cents-to-kwh-rate/): general context. Convert tariff prices into pounds, dollars or euros per kWh, keep consumption units separate, and check a result with simple arithmetic. - [How to measure appliance electricity use in kWh](https://wattandhome.com/guides/measure-appliance-electricity/): general context. Capture appliance kWh, completed cycles and conditions in a device-local journal or printable record, then estimate costs without overstating a short sample. - [Time-of-use appliance costs: energy shares and tariff break-even](https://wattandhome.com/guides/time-of-use-appliance-cost/): general context. Price energy across tariff windows, include fixed charges in a whole-home comparison, and calculate the off-peak share needed for an illustrative plan to win. - [How much does a fridge cost per day or per month?](https://wattandhome.com/guides/fridge-cost-per-day/): general context. Convert annual fridge consumption into daily and monthly cost averages, distinguish averages from measurements, and avoid rated-watt shortcuts. - [Replacing an old fridge: estimate savings against keeping it](https://wattandhome.com/guides/replace-old-fridge-energy-savings/): general context. Use a documented replacement energy figure, an explicit current-fridge baseline and net upfront costs to compare keeping with replacing. - [Comparing fridge and freezer sizes without losing sight of running cost](https://wattandhome.com/guides/fridge-freezer-size-comparison/): general context. Compare chilled and frozen capacity, annual household energy and purchase prices, rather than choosing by efficiency class alone. - [Washing-machine electricity cost per load](https://wattandhome.com/guides/washing-machine-cost-per-load/): general context. Calculate a documented 9 kg eco wash at your electricity price, compare weekly routines and keep water, other programmes and drying tasks separate. - [Why eco programmes take longer but can use less electricity](https://wattandhome.com/guides/eco-programmes-time-and-energy/): general context. Understand why cycle duration does not determine electricity cost, compare complete-programme kWh, and calculate a mixed weekly routine. - [Heat-pump dryer running costs and purchase-price payback](https://wattandhome.com/guides/heat-pump-dryer-running-cost/): UK context. Price two documented 9 kg heat-pump dryers, compare their dated manufacturer prices and see when a small electricity saving cannot recover a higher purchase cost. - [Dishwasher electricity cost per cycle and per year](https://wattandhome.com/guides/dishwasher-cost-per-cycle/): general context. Calculate a documented eco dishwasher cycle at your tariff, apply your weekly routine, and separate electricity from water and detergent. - [Comparing two appliances on compatible electricity inputs](https://wattandhome.com/guides/compare-appliance-running-costs/): general context. Normalize annual, per-cycle and per-100-cycle figures, apply one household routine, and separate running-cost savings from purchase cost. - [Replacement payback: what the calculation means and leaves out](https://wattandhome.com/guides/replacement-payback-explained/): general context. Calculate simple electricity-savings payback, include confirmed replacement costs, and distinguish a payback period from a purchase recommendation. - [Appliance purchase price and electricity cost over time](https://wattandhome.com/guides/appliance-total-cost-of-ownership/): general context. Compare appliance purchase prices and electricity over five or ten years, calculate a break-even tariff, and keep other ownership costs explicit. - [How to calculate electricity cost from watts and hours](https://wattandhome.com/guides/calculate-electricity-cost-watts-hours/): general context. Convert appliance input watts and use time into kWh and electricity cost, with worked examples and a measured-energy option for cycling appliances. - [Which appliances add most to your electricity bill?](https://wattandhome.com/guides/which-appliances-use-most-electricity/): general context. Build a household appliance-cost ranking from energy and use frequency, rather than assuming the highest wattage always creates the largest bill. - [How much does a 1500 W electric heater cost to run?](https://wattandhome.com/guides/1500w-heater-running-cost/): general context. Calculate a 1500 W heater’s hourly, daily and seasonal electricity costs using your tariff, with a clear distinction between full-power and thermostat-controlled use. - [Oil-filled radiator vs fan heater: which costs less to run?](https://wattandhome.com/guides/oil-filled-radiator-vs-fan-heater-cost/): general context. Compare oil-filled and fan heaters using equal electrical input, heating conditions and measured energy, without treating retained warmth as free electricity. - [How much does a dehumidifier cost to run for 24 hours?](https://wattandhome.com/guides/dehumidifier-cost-24-hours/): general context. Work out a dehumidifier’s 24-hour electricity cost and distinguish continuous full-input estimates from measured use with humidistat cycling. - [Compressor vs desiccant dehumidifiers: compare running costs](https://wattandhome.com/guides/compressor-vs-desiccant-dehumidifier-cost/): general context. Compare dehumidifier energy costs in the conditions where you will use it, and understand why watts, water removal and litres per kWh answer different questions. - [Portable and window AC running costs: per hour and month](https://wattandhome.com/guides/portable-window-air-conditioner-cost/): general context. Estimate portable or window air-conditioner electricity costs from input watts or measured energy, using your own daily hours, cooling days and tariff. - [Fan vs air conditioner: running cost and what each does](https://wattandhome.com/guides/fan-vs-air-conditioner-running-cost/): general context. Compare illustrative fan and air-conditioner electricity costs while separating airflow for comfort from the energy needed to remove heat from a room. - [BTU/h vs watts: which AC figure belongs in a cost calculator?](https://wattandhome.com/guides/btu-vs-watts-air-conditioner/): general context. Separate air-conditioner cooling capacity, electrical input, efficiency metrics and accumulated kWh before estimating the electricity bill. - [Air fryer vs electric oven: compare cost for the same meal](https://wattandhome.com/guides/air-fryer-vs-oven-electricity-cost/): general context. Compare air-fryer and oven electricity for equal portions, including preheating and multiple batches, with a measured whole-meal option and worked example. - [Microwave running cost: use input watts, not cooking watts](https://wattandhome.com/guides/microwave-running-cost-input-watts/): general context. Find the electrical consumption figure for microwave costs, distinguish it from advertised cooking output, and calculate a short session without overstating precision. - [US appliance running costs: from EnergyGuide to a household decision](https://wattandhome.com/guides/us-appliance-running-costs/): US context. Follow a US workflow for annual kWh, dollars per kWh, washer energy boundaries, household totals, tariff comparison and replacement payback. - [UK and EU appliance running costs: label, programme and tariff](https://wattandhome.com/guides/uk-eu-appliance-running-costs/): EU context. Follow a GBP or EUR workflow using the correct GB, NI or EU label, annual and cycle units, household routines and purchase or replacement comparisons. - [EU appliance running costs: energy labels, tariffs and buying costs](https://wattandhome.com/guides/eu-appliance-running-costs/): EU context. Use an EU product sheet and your own electricity tariff to price appliance energy, compare two documented 9 kg dryers and test purchase-price payback. - [Measured dryer costs: a US household case study](https://wattandhome.com/guides/measured-dryer-running-cost-case-study/): US context. Explore a published household dryer measurement, calculate electricity costs and replacement payback, and keep observed energy separate from annual projections. ## Energy-label guides - [What does “kWh per 100 cycles” mean?](https://wattandhome.com/energy-labels/kwh-per-100-cycles/): EU context. Convert a documented washing-machine label into cost per cycle and annual laundry cost, and understand the small rounding difference in its product sheet. - [US EnergyGuide running costs: use annual kWh and your local rate](https://wattandhome.com/energy-labels/us-energyguide-running-cost/): US context. Read a US EnergyGuide estimate, reprice a documented refrigerator figure in dollars, and keep washer, hot-water and household-bill boundaries clear. - [A to G energy ratings: compare the figure as well as the letter](https://wattandhome.com/energy-labels/energy-rating-a-to-g/): EU context. Understand what a rescaled energy class can tell you, why old plus ratings do not translate directly, and how to compare running costs. - [UK appliance energy labels: Great Britain and Northern Ireland](https://wattandhome.com/energy-labels/uk-energy-labels-gb-ni/): UK context. Check the label regime, model information and consumption units before applying a UK electricity tariff, especially for tumble dryers. - [Reading a fridge or freezer energy label](https://wattandhome.com/energy-labels/fridge-energy-label/): EU context. Find annual kWh, check chilled and frozen storage capacity, and turn a fridge label into an estimate using your own electricity tariff. - [Dishwasher energy labels: kWh, water and cycle time](https://wattandhome.com/energy-labels/dishwasher-energy-label/): EU context. Read dishwasher kWh per 100 eco cycles, litres per cycle, place settings and duration using a documented label, then estimate running cost. - [The EU tumble-dryer label introduced in 2025](https://wattandhome.com/energy-labels/tumble-dryer-label-2025/): EU context. Use energy per 100 eco drying cycles on the EU A–G label, distinguish older annual figures, and check the separate UK position. - [Washer-dryer labels: washing only versus a complete cycle](https://wattandhome.com/energy-labels/washer-dryer-two-energy-figures/): EU context. Choose the correct side of a combined washer-dryer label and avoid double-counting washing energy when estimating wash-and-dry costs. - [EPREL lookup: check an appliance model and energy label](https://wattandhome.com/energy-labels/eprel-product-information/): EU context. Use an EU label QR code or EPREL model search to find product information, verify energy units and build a compatible appliance comparison. - [EU air-conditioner energy labels: SEER, SCOP and kWh](https://wattandhome.com/energy-labels/air-conditioner-energy-label/): EU context. Read EU air-conditioner cooling and heating information, distinguish SEER and SCOP from consumption, and price the correct annual or hourly energy figure.