Brush cleaning schedule calculator
Tell the calculator your brush type, whether you use liquids or powders with it, your skin type, whether you are acne-prone, and how many uses a week it gets. It returns a wash interval in days, a deep-clean interval, and the drying time to plan around.
Work out your wash interval
Answer for one brush at a time. The brush type and the product form matter more than anything else here.
The result is a starting schedule. If your skin dislikes it, move one step shorter rather than buying a new product.
About this tool and its limits
Purpose: to support one decision, from numbers you supply.
Not suitable for: any medical, legal, safety or warranty decision.
Method type: arithmetic on your inputs, or an editorial rule stated below. It is not a validated model.
Accountable publisher: the editorial desk of this store.
Method version: 1.0. Last checked: 2026-09-14.
The calculation runs in your browser. This tool's own code does not save or transmit your answers. Separate site analytics and other services are described in our privacy policy.
| Input | What it means | Accepted values |
|---|---|---|
| Uses per week | Used directly in the calculation. | any number, default 7 |
| Brush type | Used directly in the calculation. | Complexion: foundation, concealer, cream blush, Powder: setting powder, blush, bronzer, highlighter, Eye or lip brush, Blending sponge |
| What it carries | Used directly in the calculation. | Mostly liquids and creams, Mostly powders, A mix of both |
| Skin type | Used directly in the calculation. | Oily, Combination, Dry |
| Acne-prone or currently breaking out | Used directly in the calculation. | No, Yes |
Worked example
With the pre-filled values shown above, it returns:
| Headline result | Wash every 5 days |
| Deep clean every | 15 days |
| That works out at roughly | every 5 uses |
| Dry time to plan for | 8 to 12 hours |
| Between washes | Wipe the bristles on a tissue or use a brush cleanser, then let the head air dry before it goes back in the holder. |
| How to wash it | Lukewarm water on the bristles only with the head pointing down, gentle shampoo or a brush cleanser, rinse until the water runs clear, squeeze in a towel, reshape with your fingers, dry flat with the tips over an edge. |
Calculation checks
| Case | Observed behaviour |
|---|---|
| Boundary input (highest accepted values) | Wash after every use |
| Invalid input (zero values) | Wash every 5 days |
These checks show the tool behaves as documented. They do not establish medical or scientific validity.
What this result cannot tell you. It is an estimate derived entirely from the numbers you enter, using the relationships described on this page. It does not measure your situation, it does not account for anything not listed as an input, and it cannot establish which product you should buy. Where the result matters for your health, safety, money or a warranty, treat it as a starting point and check it against the primary source linked at the bottom of this page.
Products and commercial interest. This store sells the products these guides discuss. Product data never changes a calculation. To report a problem, use the contact page and include this page's URL, the inputs you used and the result you expected.
How the calculation works
- It starts from a published base interval for your brush type. Complexion brushes get weekly, eye brushes fortnightly, dry powder brushes up to monthly, sponges after every use. Those tiers come from the guidance listed at the bottom of this page.
- Then it applies a ceiling for the product form. If a brush carries liquid or cream, the interval is capped at 7 days whatever its type. If it carries a mix, the ceiling is 14 days. Powders leave the head dry, which is why powder brushes get the most slack.
- Then it scales for skin type. Oily skin multiplies the interval by 0.7 and combination skin by 0.85, on the basis that more oil on the brush means more for the brush to hold.
- Then it halves for acne-prone skin. That is a precaution, not a proven treatment. Cleaning frequency was not significantly associated with reported skin problems in the survey data cited below, so treat the adjustment as hygienic caution rather than a fix.
- Then it scales for how hard the brush works. 21 or more uses a week multiplies by 0.6, 14 or more by 0.75, and 3 or fewer by 1.5. The floor is 1 day and the ceiling is 30.
- The last row shows every adjustment applied, so you can see which input moved the answer and disagree with it.
The base intervals, and where they come from
| Brush | Base interval | Source of the interval |
|---|---|---|
| Complexion (foundation, concealer, cream blush) | 7 days | Cleveland Clinic: brushes used with wet products such as foundation or concealer should be washed once a week. |
| Eye brushes | 14 days | Cleveland Clinic: brushes used around the eyes should be washed every two weeks, because the eye area is more prone to infection. |
| Dry powder brushes | 30 days | Cleveland Clinic: most brushes used for dry cosmetics such as powder and blush can be washed once a month. |
| Blending sponge | Every use | A sponge is used wet and stays damp, which the contamination research links to bacterial growth. |
| All brushes, as a floor | 7 to 10 days | American Academy of Dermatology: wash brushes every 7 to 10 days, rinse only the tips, and never share them. |
What the contamination research actually says
A study of 57 used brushes and blenders in Jeddah identified 71 bacterial strains, 81% of them Gram-positive, with Micrococcus, Staphylococcus and Bacillus the dominant families. A separate UK study of used cosmetic products found 79% to 90% contaminated, with beauty blenders carrying an average load above 106 CFU per ml. What those studies support is that used tools carry bacteria, including species associated with skin infection. What they do not support is the idea that a cleaning schedule cures acne: the NHS lists dirty skin and poor hygiene as a myth about acne causes, and in the Jeddah survey the association between cleaning frequency and reported skin problems was not statistically significant (p = 0.698). Clean your brushes for hygiene and for how your makeup applies. Treat breakouts as a separate problem with a separate answer.
Use this with
- Makeup brush guide: every brush type with its job, best material and common mistake
- How to clean makeup brushes (and how often)
- How to store brushes without wrecking the shape
- Makeup brush types decoded
Sources
- American Academy of Dermatology. How to clean your makeup brushes — www.aad.org/public/everyday-care/skin-care-secrets/routine/clean-your-makeup-brushes
- Cleveland Clinic (Melissa Piliang, MD). How to clean your makeup brushes and why you need to — health.clevelandclinic.org/cleaning-makeup-brushes
- Attar RMS, Imam MA. Assessing the levels and types of bacterial contamination in cosmetic brushes: implications for beauty and hygiene in Jeddah City. International Journal of Microbiology, 2025 — pmc.ncbi.nlm.nih.gov/articles/PMC12074853/
- Bashir A, Lambert P. Microbiological study of used cosmetic products: highlighting possible impact on consumer health. Journal of Applied Microbiology 128(2):598-605, 2020 — doi.org/10.1111/jam.14479
- NHS. Acne: causes (including the myth that acne is caused by dirty skin and poor hygiene) — www.nhs.uk/conditions/acne/causes/