Brush Care guide
Makeup-brush shapes and sizes: read the working head
Compare makeup-brush head shapes, working surfaces, dimensions and intended formulas. Shape names and brush numbers do not guarantee the same tool across brands.
Choose a makeup brush by the job it is intended to do and the head you will actually handle. Flat, rounded, angled and tapered describe parts of a shape; they do not tell you the complete size, density, compatible formula or care routine. A brush number is a maker's identifier rather than a universal size.
Start with the formula and the area
Read the directions for the makeup and the exact brush. A listing may name a formula type, an application area or both. Treat that as information about the named item, rather than assuming every similar-looking brush has the same intended use.
For example, MAC describes its 190S as a flat foundation brush for liquid, cream and gel formulas, while its 217S has an oval eye-brush head described for powder and cream. These are documented examples, not a comparison of results or a recommendation to buy either brush.
If you already have a suitable tool, name what is missing before choosing another. You might need a smaller working edge, a different grip or a format that fits your carrier. A different silhouette by itself does not establish an improvement.
Read the outline and the profile separately
| Listing term | Useful question | What the term leaves open |
|---|---|---|
| Flat or paddle | How wide and thick is the working head? | Formula suitability and how the fibres behave |
| Rounded or domed | What are the head width and side profile? | Actual density, flexibility and your preferred handling |
| Angled | Which edge is angled, and how large is it? | Whether the complete head suits the intended task |
| Tapered | How much of the head narrows towards the tip? | Tip size and the shape under use |
| Fan | How wide is the spread in its natural shape? | Fit inside a guard, pocket or case |
| Dense or fluffy | Is the description supported by useful detail or photographs? | A measured density or guaranteed finish |
These descriptions can overlap. A head may be both angled and dense, or rounded and tapered. Avoid treating the labels as mutually exclusive product classes.
Record three dimensions without compressing the brush
For an item you own, record overall handle-to-tip length, natural head width and the side profile. Keep those measurements separate. Two brushes of equal length can place very different demands on a storage compartment.
For an online listing, distinguish an actual dimension from one estimated using a photograph. Ask for a missing measurement if it matters to the purchase. Do not infer centimetres from an unscaled image, or assume a brush shown beside a compact uses the same proportions as your own kit.
Our original dimension illustration identifies where measurements are taken. It does not set a universal brush size, pressure, clearance allowance or application result.
Include the handle in the comparison
The head performs the application job, but you hold the whole assembly. Check available handle length, the position of a wide ferrule and whether your usual grip is possible. A travel label may describe the handle without telling you whether the head changed too.
Use the travel versus full-size comparison when packed length is the main constraint. Use double-ended versus single-ended brushes if both ends carry working heads.
Choose the smallest useful change
Write down the intended formula, required working surface, confirmed dimensions and unresolved detail. Then check care and storage. A brush with a useful head still needs a routine you can complete and a place where it can be kept in the condition its maker directs.
If a set contains several apparently similar heads, compare their documented jobs with the brushes you own before counting each as a missing tool. The set-versus-individual guide turns that inventory into a buying decision.
Evidence and source notes
This guide compares documented specifications and ownership choices. It does not report a hands-on product test.
- MAC UK: 190S Foundation Brush (manufacturer; checked 2026-10-26). One flat/paddle brush and its stated liquid, cream and gel uses. Not a general rule for every flat brush.
- MAC UK: 217S Blending Brush (manufacturer; checked 2026-10-26). One oval eye-brush head and its powder/cream description. Not a standard meaning for a number or shape across brands.