How we calculate
We estimate how much laundry your household produces each week — roughly 11 to 13 pounds per adult, more with babies, sports kit or pet bedding — and divide it by the number of wash days you prefer. A washer drum should be filled about three-quarters full for good cleaning, which works out to roughly 4 pounds of mixed laundry per cubic foot of drum. If you wash king-size comforters at home, we set a floor of 4.5 cu ft so the bedding can move freely.
For running costs we use typical per-cycle figures for modern machines: about 13 gallons for a high-efficiency front-loader, 19 gallons for a high-efficiency top-loader with an impeller, and 27 gallons for a traditional agitator top-loader. About a third of wash water is assumed to be heated by 60°F. Motor energy per load and the moisture left after the spin cycle are also included, because a faster spin can cut dryer energy considerably.
Figures are averages for comparison only; check the yellow EnergyGuide label or the manufacturer data sheet for specific models.
Washing machine buying guide
Capacity in cubic feet vs. kilograms
US brands list drum volume in cubic feet, while European and Asian brands list the maximum dry load in kilograms. As a rough guide, 3.5 cu ft corresponds to about 7–8 kg, 4.5 cu ft to 9–10 kg and 5.0+ cu ft to 11–12 kg.
Front-load washers
Front-loaders tumble clothes through a small pool of water, using less water and detergent and spinning faster (typically 1,200–1,400 RPM). They are gentler on fabric and can be stacked with a dryer. Leave the door ajar after washing to prevent mildew on the door gasket.
High-efficiency top-load washers
These use an impeller instead of a tall agitator, offering a larger drum and lower water use than classic models. They are comfortable to load without bending and generally have shorter cycles than front-loaders.
Agitator top-load washers
The traditional design is simple, fast and affordable, and handles heavily soiled work clothes well. The trade-off is higher water consumption and more wear on fabrics.
Features worth paying for
Steam cycles help with stains and allergens, automatic detergent dosing prevents over-use, and a quiet direct-drive inverter motor matters if your laundry area is near living spaces. Smart connectivity is mainly useful for end-of-cycle notifications.
Frequently asked questions
What size washing machine do I need?
1–2 people: 3.0–3.8 cu ft (7–8 kg). 3–4 people: 4.2–4.5 cu ft (9–10 kg). 5+ people or bulky bedding: 5.0 cu ft (11+ kg) or larger.
Are front-load washers cheaper to run?
Usually yes — they use less water and their faster spin shortens drying time.
What spin speed should I look for?
1,200–1,400 RPM is ideal for most homes. Use lower speeds for delicates.
Is a bigger washer always better?
Not if you mostly run small loads. A drum that is too big wastes water on partial loads unless it has automatic load sensing.
How long does a washing machine last?
Typically 10–13 years. Cleaning the filter and gasket regularly extends its life.
About WashWise
WashWise is an independent free calculator that helps households choose a washing machine based on their real laundry volume and local utility prices. We do not sell appliances and are not affiliated with any manufacturer or store.
Contact
Send questions or feedback to info@home-appliances-and-accessories.shop.
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Last updated: October 2026
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All content and calculations are provided for informational purposes only, "as is", without warranty. Utility costs and appliance consumption vary by model, settings, water temperature and local rates. Verify specifications, dimensions and installation requirements with the manufacturer before purchasing. We accept no liability for decisions based on this site. Brand names belong to their owners; third-party ads do not represent our endorsement.