A fan brush is one of the few brushes whose job changes completely with its size. A tiny fan flicks individual grass blades and eyelashes on a portrait; a large one stamps whole evergreen trees in a single press, the way television landscape painters made famous. Buying the wrong size is the main reason people decide fan brushes are “useless.” Understanding fan brush sizes, what the numbers mean, and which width suits which job saves a lot of trial and error.
Quick answer: Fan brush sizes are usually labeled with numbers, such as 0, 2, 4, 6, 8 and 10, or with a width in inches for large landscape fans. Larger numbers mean a wider spread of bristles, but sizes are not standardized between brands, so always check the actual width. As a rough guide, small fans (about 1/2 inch wide or less) suit detail texture and fine blending, medium fans (about 1/2 to 1 inch) handle foliage, grass and soft blending on mid-size canvases, and large fans (1 inch and wider) cover trees, skies and large landscapes.
How Fan Brush Sizes Are Labeled
Brush sizing is one of the less consistent things in art supplies. Each manufacturer sets its own scale, and a size 4 fan from one brand may be noticeably wider or narrower than a size 4 from another. That said, most labeling follows one of two systems.
Number sizes
Most artist brush lines use even numbers for fan brushes, often from 0 or 2 up to 8, 10 or 12. The number relates loosely to the width of the ferrule and the spread of the bristles. Some lines include odd numbers or sizes like 1/0 for very small fans.
Width sizes
Larger landscape fans, house-painting-style fans, and some decorative painting brushes are labeled by width, such as 1/2 inch, 1 inch, or 2 inches. This tells you the approximate span of the bristles at the widest point, which is easier to compare across brands.
Long handle vs short handle
Fan brushes for oil and acrylic often have long handles for easel work, while watercolor and detail fans usually have short handles. Handle length does not change the size number but affects how you control the stroke.
Fan Brush Size Chart
Because sizing varies, treat this chart as an approximate map. Always check a specific brush’s stated width or measure the bristle spread yourself.
| Size label (typical) | Approximate bristle spread | Size group | Typical uses |
|---|---|---|---|
| 0 to 2 | Under about 3/8 inch | Small | Eyelashes, fur tips, fine grass, small texture, tiny highlights |
| 4 | About 3/8 to 1/2 inch | Small to medium | Distant foliage, small trees, hair texture, soft blending |
| 6 | About 1/2 to 3/4 inch | Medium | Grass, shrubs, waterfalls, cloud edges, blending on mid-size canvases |
| 8 | About 3/4 to 1 inch | Medium to large | Trees, bushes, water reflections, sky blending |
| 10 to 12 | About 1 inch or more | Large | Large evergreens, broad foliage masses, big skies |
| 1 to 2 inch (width-labeled) | About 1 to 2 inches | Extra large | Landscape trees, large canvases, wet-on-wet skies and foliage |
If you are shopping now, our roundup of the best fan brush options lists actual bristle widths alongside size numbers so you can compare across brands.
What Each Fan Brush Size Does Best
Small fan brushes
Small fans are precision tools. Their few, thin bristles make individual marks that look like hair, grass blades, or fur when you flick upward. Portrait painters use them to suggest eyelashes or eyebrow texture, and wildlife painters use them for fur tips. In watercolor, a soft small fan can lift or lightly blend small areas.
Because a small fan holds little paint, it is best for finishing touches rather than coverage. It also suits small canvases, sketchbooks and miniatures.
Medium fan brushes
Medium fans are the most versatile. On a 9 by 12 to 16 by 20 inch canvas, a medium fan can paint grass, bushes, distant trees, and the textured edge of a waterfall, and it can soften transitions between colors in skies. Many beginners find that one medium fan covers most of what they need.
Our guide to fan brush techniques for painting shows how stippling, flicking and dragging produce different textures, most of which start with a medium fan.
Large fan brushes
Large fans shine in landscape painting. Tapping the corner of a large fan loaded with dark green produces a full evergreen shape quickly, especially on larger canvases. They also blend wide areas of sky or water, and they push large masses of foliage in a few strokes. On small canvases, a large fan can overwhelm the composition and make texture look clumsy.
Large fans also work well for wet-on-wet skies, where a light, criss-cross motion with a dry fan softens cloud edges and blends color bands into a smooth gradient. The key is to keep the brush nearly dry and the pressure light; a loaded large fan drags paint around rather than blending it. Wipe the bristles on a rag frequently so the fan does not reintroduce color from earlier strokes.
For a step-by-step approach to painting evergreens and deciduous trees with a fan, see our tutorial on how to use a fan brush for trees.
Matching Fan Brush Size to Canvas Size
A simple way to choose a size is to think about the canvas first, then the task.
| Canvas size | Main fan for texture | Detail fan | Blending fan |
|---|---|---|---|
| Small (up to about 8 by 10 inches) | Small to small-medium | Smallest size | Small soft fan |
| Medium (about 11 by 14 to 16 by 20 inches) | Medium | Small | Medium soft fan |
| Large (about 18 by 24 inches and up) | Large or 1-inch width | Small to medium | Large soft fan |
Many painters keep three fans: one small for details, one medium as a daily workhorse, and one large for big shapes and skies.
Bristle Type Matters as Much as Size
Two fans of the same size behave very differently depending on the bristles.
| Bristle type | Feel | Best media | Strengths |
|---|---|---|---|
| Natural hog bristle | Stiff, springy, split tips hold paint | Oil, heavy-body acrylic | Bold texture, trees, grass, thick paint |
| Stiff synthetic | Firm, resilient, easy to clean | Acrylic, oil | Texture, durability, works with water-based media |
| Soft synthetic | Smooth and flexible | Acrylic, watercolor, oil glazes | Blending, soft transitions, fine texture |
| Soft natural hair (e.g., sable, squirrel, goat) | Very soft, absorbent | Watercolor, gouache, delicate oil blending | Gentle blending, smooth washes |
For texture such as foliage and grass, stiffer bristles in a medium or large size work best. For blending skin tones, skies or smooth gradients, a softer fan of the right size is the better tool.
Bristle Length and Spread
Besides width, fan brushes vary in how long the bristles are and how widely they splay:
- Short, dense fans are stiffer and give more controlled, stamped textures.
- Long, sparse fans are springier and create looser, wispier marks, which is good for grass and hair.
- Thick fans hold more paint and suit larger landscape work.
- Thin fans with a single layer of bristles leave more distinct individual lines.
Look at the brush in profile as well as face-on. Two fans with the same width can have very different thickness and spring.
How to Measure a Fan Brush Yourself
Since size numbers are unreliable across brands, measuring takes the guesswork out. Lay the brush flat on a ruler with the bristles relaxed, not pressed, and measure the widest span at the tips. Then measure the length of the bristles from the edge of the ferrule to the tips. Finally, look at the brush from the side to judge thickness. Write these three numbers on a piece of tape on the handle if you own several fans that look alike. When buying online, look for the listed bristle width or a photo beside a ruler; if neither is shown, the ferrule width is a reasonable minimum, since the bristles spread wider than the metal.
Fan Brush Sizes by Medium
Oil painting
Oil painters tend to use medium and large stiff fans for landscapes and textured foliage, plus a soft medium fan for blending skies and skin. Long handles help when working at an easel. Because oil paint stays wet for a long time, a clean soft fan can also be dragged lightly across a passage to soften brushstrokes.
Acrylic painting
Acrylic dries fast, so fans are often used for quick texture rather than slow blending. Medium stiff synthetic fans are a common workhorse. For blending, work quickly with a slightly damp soft fan, or add a retarder or slow-drying medium to extend working time.
Watercolor and gouache
Watercolorists typically prefer small to medium soft fans with short handles. They are used for grass texture with drier paint, gentle lifting, and spattering. Very stiff fans can damage the paper surface, especially when wet.
Starter Fan Brush Sets by Painter Type
| Painter type | Suggested sizes | Bristle choice |
|---|---|---|
| Landscape painter (oil or acrylic) | Medium plus a large or 1-inch fan | Stiff hog or firm synthetic |
| Portrait painter | Small plus a soft medium | Soft synthetic or soft natural hair |
| Watercolorist | Small and medium | Soft synthetic or natural hair |
| Wildlife painter | Small and medium | Firm synthetic for fur, soft for blending |
| Miniature or detail painter | Smallest available sizes | Firm synthetic |
How to Choose Your First Fan Brush Size
- Consider your usual canvas size. Most beginners paint on small to medium canvases, which points to a medium fan.
- Think about your subjects. Landscapes and trees favor medium to large stiff fans. Portraits and wildlife favor small soft fans.
- Match the bristle to your medium. Stiff synthetic or hog for oil and acrylic texture; soft synthetic or natural hair for watercolor and blending.
- Check the actual width. Compare stated bristle spread, not just the size number, especially when buying from a new brand.
- Add sizes as you need them. After using one medium fan for a while, you will know whether you need a smaller detail fan or a larger landscape fan.
Common Fan Brush Size Mistakes
- Using a large fan on a small canvas. The texture becomes oversized and repetitive. Size down.
- Using a tiny fan for broad areas. It holds too little paint and leaves streaky, slow coverage.
- Assuming size numbers match between brands. Compare actual measurements.
- Choosing a soft fan for heavy texture. Soft bristles collapse under thick paint.
- Overloading any size. Too much paint clumps the bristles together, so the fan stops making separate marks. Load lightly and tap off excess.
Caring for Fan Brushes of Any Size
- Clean promptly so paint does not dry at the base and clump the fan shape.
- Reshape the bristles into an even fan after washing.
- Dry flat so the fan does not bend.
- Do not stand brushes on their bristles in water; fan shapes distort easily.
- Store in a holder or roll that protects the bristles from being squashed.
FAQs
What size fan brush is best for beginners?
A medium fan, often around size 4 to 6 depending on the brand, suits most beginners because it handles grass, foliage, blending and small trees on common canvas sizes.
Are fan brush sizes the same across brands?
No. Each brand uses its own scale, so the same number can mean different widths. Check the stated bristle width or measure the brush to compare.
What size fan brush is best for trees?
Medium to large stiff fans work well for trees, with large fans or 1-inch widths suiting big canvases and medium sizes suiting smaller ones.
What is a small fan brush used for?
Small fans are used for fine textures such as eyelashes, fur tips, grass blades and delicate highlights, and for soft blending in small areas.
Do I need more than one fan brush?
Many painters start with one medium fan and add a small and a large one later. Three sizes cover most detail, texture and blending tasks.
Which fan brush size is best for blending?
A soft fan sized to the area you are blending: small for faces and small details, medium for skies on mid-size canvases, large for broad backgrounds.
Final Thoughts
Fan brush sizes run from tiny detail fans to wide landscape brushes, and the right one depends on canvas size, subject and bristle type. Because numbers vary between brands, compare real widths, and start with a medium fan if you are unsure. Once you know which jobs you reach for most, adding a small and a large size rounds out the set. To compare widths, bristle types and handle lengths side by side, see our list of top fan brushes for blending and landscapes.
