Washing machine capacity is expressed in kilograms of dry laundry, and that is already a source of confusion: it refers to the weight of the laundry before washing, not once it is wet. Too small, and you multiply cycles. Too large, and you wash half-empty loads while paying for bulk you do not need. Here is how to get it right.
Matching capacity to the household
The usual benchmarks are as follows: 5 to 6 kg for one person, 7 kg for a couple, 8 to 9 kg for a family of three or four, and 10 kg or more for large families or bulky laundry.
These figures are a starting point, not an absolute rule. Two households of identical size can have very different needs depending on how often they wash and what kind of laundry they handle.
The most telling practical benchmark: an 8 kg drum swallows a single duvet, a 10 kg drum a double. If you wash your bedding at home rather than sending it out, that single criterion often decides the capacity, far more than the number of occupants.
- 1 person: 5 to 6 kg
- Couple: 7 kg
- Family of 3 to 4: 8 to 9 kg
- Large family or double duvet: 10 kg and above
What "8 kg" actually means
The stated capacity refers to the weight of dry cotton laundry, measured on the cotton programme at full load. It is a standardised value allowing models to be compared with each other, not a universal loading instruction.
The point often overlooked is that this maximum capacity applies only to the cotton programme. On other programmes the permissible load is much lower: generally half on synthetics, and sometimes only a quarter on wool or delicates. An 8 kg drum therefore takes only 3 to 4 kg of synthetics.
Another useful benchmark to avoid overloading: once the laundry is in place, roughly a hand width of free space should remain between the top of the load and the top of the drum. Laundry needs to fall to be washed. A stuffed drum turns as a solid block, and the laundry comes out badly rinsed and sometimes marked with detergent.
Weighing your laundry without scales
Nobody weighs their wash, but a few rough figures let you estimate a load and check whether the capacity you have in mind matches your reality.
A shirt weighs about 200 grams, a T-shirt 150 grams, a pair of jeans between 700 and 800 grams, a bath towel about 700 grams, a double sheet around 800 grams, and a double duvet between 2 and 3 kilograms.
Do the sum for a typical load in your household. Many people discover they actually run 4 to 5 kg washes while considering a 10 kg appliance.
- T-shirt: about 150 g
- Shirt: about 200 g
- Jeans: 700 to 800 g
- Bath towel: about 700 g
- Double duvet: 2 to 3 kg
Think habits rather than headcount
How often you wash matters as much as household size. If you run one or two large loads a week, you need capacity. If you run a small load every day, a more compact model is ample and will cost you less.
The type of laundry counts too. A household with young children, pets, or regular sport generates a lot of laundry needing frequent washing and sometimes high temperatures, which argues for a generous drum.
Finally, if someone in the household is allergic to dust mites, washing bedding often and at high temperature becomes a necessity: capacity must then allow a complete set to be handled in a single cycle.
Capacity, consumption and half loads
Recent washing machines detect the actual weight of the load and adjust the amount of water. A large capacity used half full is therefore not the disaster it is sometimes made out to be, but it is not neutral either.
The adjustment applies mainly to water, less to everything else: the drum, heavier and larger, takes the same energy to drive, and cycle duration does not shorten. A half-empty machine therefore remains less efficient per kilogram washed.
Be wary of half-load buttons, which give the impression of halving consumption. They mainly reduce duration and water use, for a far more modest real energy saving, since heating water remains the dominant factor. Two half loads consume noticeably more than one full load.
The practical conclusion is simple: size for your typical wash rather than your annual peak, then load properly. For the duvet you wash twice a year, a launderette costs less than three extra kilograms of drum paid for over fifteen years.
- Automatic adjustment applies mainly to water
- A half-empty machine stays less efficient per kilogram
- Two half loads consume more than one full load
- Size for the typical wash, not the annual peak
Dimensions and installation constraints
Moving up in capacity often means moving up in depth. The width and height of front-loading washing machines are fairly standardised, but depth varies a great deal, and that is what causes problems in a narrow bathroom or under a worktop.
Measure three things before buying: the installation space itself, the clearance needed to open the door, and above all the route to the room. Doorways, corridors and stairwell turns are the classic cause of a delivery that cannot be installed.
If space is tight, the top-loading format offers a reduced width of around forty centimetres for a capacity often close to that of a standard front loader. It cannot be built in under a worktop, since it opens from above.
Finally, check that the floor is level and that the machine rests on all four adjusted feet. A poorly levelled machine vibrates, walks during the spin and wears out early, all the more so with a large drum.
Frequently asked questions
What washing machine capacity for a family of four?
Allow 8 to 9 kg for a family of three or four. Adjust that benchmark to your habits: one or two large weekly loads need more capacity than daily small ones. If you wash your bedding at home, note that an 8 kg drum swallows a single duvet and that 10 kg is needed for a double.
Do the stated kilograms refer to dry or wet laundry?
Dry laundry, weighed before washing, and in cotton. It is a standardised value measured on the cotton programme at full load, used to compare models with each other. On other programmes the permissible load is much lower: roughly half on synthetics, and sometimes only a quarter on wool or delicates.
How do I know if my drum is overloaded?
Roughly a hand width of free space should remain between the top of the load and the top of the drum. Laundry needs to fall in order to be washed properly. A stuffed drum turns as a solid block: laundry comes out badly rinsed, sometimes marked with detergent, and the bearings wear prematurely.
Does the half-load button halve consumption?
No, far from it. It mainly reduces cycle duration and water use, but the real energy saving is far more modest because heating water remains the dominant factor. Two half loads consume noticeably more than one full load: better to wait until you have enough to fill the machine properly.
Should I buy bigger just to be safe?
Rarely. A half-empty machine remains less efficient per kilogram washed, because the heavier drum takes the same energy to drive and cycle duration does not shorten. Size for your typical wash rather than your annual peak: for the duvet washed twice a year, a launderette costs less than three extra kilograms of drum paid for over fifteen years.
What measurements should I take before buying?
Three, and not just the installation space. Measure the recess, the clearance needed to open the door, and above all the route to the room: doorways, corridors and stairwell turns are the classic cause of a delivery that cannot be installed. Note that moving up in capacity mainly translates into greater depth.
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