How often should you take out the trash?

Empty a kitchen can every other day as a habit, and daily if the weather is warm or anything wet, meaty or animal went in it. Bathroom cans can go weekly. Office and paper bins can go fortnightly. The useful rule is that the clock starts when the first wet thing goes in the bag, not when the bag reaches the top - a half-full can with chicken trimmings in it is more urgent than a full one of cardboard.

Most people run on the other rule - empty it when it is full - which is why kitchen cans smell. It is also why buying a bigger can usually makes the smell worse rather than better: a bigger can takes longer to fill, so the oldest waste in it is older.

The smell from a trash can is the metabolic output of bacteria working on organic residue. Bacterial activity roughly doubles for every ten degrees of warmth, which is why the same waste that is inoffensive for three days in February is unpleasant in one in July. Nothing about the can changes between those two months; the arithmetic does.

• Kitchen: every other day, daily in summer. Change the liner even if the bag is not full - the liner costs pennies and the bag is where the residue is.
• Bathroom: weekly, on a day you will remember. Bathroom waste is mostly dry; the exception is anything with blood or organic matter, which goes same day.
• Nursery or diaper pail: daily, and empty the pail completely rather than topping it up. Diaper pails versus trash cans.
• Cat litter: scoop daily, empty the disposal pail every few days, and keep it out of the kitchen can. Cans for cat litter.
• Home office or bedroom: fortnightly. Keep food out of these and they will never need more.
• Garage: weekly in summer, fortnightly in winter, and never put food waste in a garage can at all. Garage can smell.
• Outdoor cart: whenever the hauler comes, with the cart put out on collection morning rather than the night before if animals are a problem.

The pattern across all of those: the interval is set by what is in the container, and the one in the kitchen is the only one that routinely contains food.

Plenty of households cannot empty a kitchen can daily - a walk-up apartment, a long driveway, a once-weekly collection with no outdoor cart. Three changes make a longer interval survivable, and all three are more effective than a stronger-smelling air freshener.

Take the food out of the stream

This is the big one. A countertop compost bin with a sealed lid takes the wettest, most active material out of the can entirely, and it is the single change that most reduces how often the can needs emptying. The compost bin itself needs emptying every few days, but it is small, sealed and designed for it.

Use a liner that actually fits

Most residue in a can comes from liquid running between the bag and the can wall, which happens when the bag is loose at the rim. A fitted liner eliminates the gap, which means the can body stays clean and the smell stays in the bag you are about to remove. Why your trash bag does not fit.

Put a carbon filter in the lid, if the can has a housing

A filter does not slow the bacteria down - it adsorbs what escapes. That makes it genuinely useful on a can emptied every three days and more or less pointless on one emptied daily. Carbon filters, assessed.

The three purchases that make a longer interval liveable: a sealed compost bin for the wet waste, a fitted liner so nothing runs down the inside, and a lid filter for what is left.

Best overall compost bin

OXO Good Grips Easy-Clean Compost Bin, 1.75 Gallon

The countertop compost bin that is actually easy to clean, because the inner bucket comes out and goes in the dishwasher.

$31.00 · View on Amazon

$37.99 · 18% off · Price as of October 16, 2026.  #ad How we make money

Best fitted liner

simplehuman Code Q Custom Fit Liners, Odorsorb

The liner that actually fits a 50-65 liter simplehuman can, with carbon worked into the film instead of a fragrance.

$40.00 · View on Amazon

Price as of October 16, 2026.  #ad How we make money

Best carbon refill

iTouchless AbsorbX Natural Activated Carbon Odor Filter Refills

The replacement carbon filter for iTouchless cans, and the one consumable that keeps a filtered can working.

$23.96 · View on Amazon

$29.99 · 20% off · Price as of October 16, 2026.  #ad How we make money

Almost always no, and this is the most common mistake in the category. A bigger can does not reduce how much waste you generate; it increases how long the oldest piece of it has been sitting there. If you are emptying a 13-gallon can every day because it is genuinely full, a 16-gallon can is a reasonable upgrade. If you are emptying it every three days because that is when it fills, going bigger makes the smell worse.

The exception is a household that is sorting properly. If the recycling stream is bulky and dry, that side can be as large as you like - cardboard does not rot. A dual-compartment can exploits this directly: a big dry side and a smaller wet side, emptied on different schedules. Dual-compartment cans and what size can for a family of four.