How Much Paint for a Fence?
Fences are measured in square feet, not room dimensions. And rough wood drinks paint.
A 100-foot fence, 6 feet high, needs about 3 gallons for one coat and 5 gallons for two. That is one side. If you are treating both sides, double it. The biggest variable is not the fence size — it is how rough the wood is.
Estimates only. Textured walls, high ceilings, sprayers and major colour changes can all increase the amount you need. Always buy slightly more than the calculation suggests.
Paint or stain needed by fence size
| Room / surface | Surface | Coats | Paint | Paint cost |
|---|---|---|---|---|
| 50 ft × 6 ft, one coat | 300 sq ft | 1 | 2 gal | $80 |
| 50 ft × 6 ft, two coats | 300 sq ft | 2 | 3 gal | $120 |
| 100 ft × 6 ft, one coat | 600 sq ft | 1 | 3 gal | $120 |
| 100 ft × 6 ft, two coats | 600 sq ft | 2 | 5 gal | $200 |
| 150 ft × 6 ft, two coats | 900 sq ft | 2 | 8 gal | $320 |
| 100 ft × 6 ft, both sides, two coats | 1,200 sq ft | 2 | 10 gal | $400 |
One side only, at 250 sq ft per gallon — the realistic figure for rough sawn fence boards. Two coats where stated.
How to work out your fence area
Multiply the length of the fence by its height. A 100-foot fence that is 6 feet tall is 600 square feet per side.
Decide whether you are treating one side or both. Most people only do the side they see. Doing both sides roughly doubles the paint, but it protects the wood far better and is the correct approach on a new fence.
Do not measure the individual boards and add them up. Gaps between boards do not consume paint, and the total surface of the boards is close enough to length × height that the difference is not worth the effort.
Rough wood is the hidden cost
This is the single biggest reason fence estimates go wrong. The coverage figure on the can — usually 350 to 400 square feet per gallon — is measured on a smooth surface.
Rough sawn cedar, pressure-treated pine and weathered boards absorb dramatically more:
- Smooth planed wood: 350-400 sq ft per gallon.
- Rough sawn or weathered wood: 200-250 sq ft per gallon.
- Very dry, first-ever coat on new untreated wood: as low as 150-200.
Always assume the lower figure for a fence. It is better to have a quarter-gallon left than to run out with twelve boards to go.
Paint or stain?
They are not interchangeable and they behave differently on a fence.
- Stain soaks into the wood rather than sitting on top. It never peels, only fades, and it is far easier to refresh later. On a fence, stain is usually the better choice.
- Paint forms a film. It gives a solid, opaque colour, but on a fence it is prone to cracking and peeling as the wood expands and contracts with the seasons.
Either way, a fence needs to be clean and dry before application. Pressure-washing is common but requires at least 48 hours of drying afterwards. Applying stain to damp wood traps moisture and causes the finish to fail.
Frequently asked questions
How much stain for a 100-foot fence?
About 3 gallons for one coat at 250 square feet per gallon, or 5 to 6 gallons for two coats. Rough or weathered wood can push this higher.
Do I need to paint both sides of a fence?
For maximum life, yes — it roughly doubles the paint needed. Most homeowners only treat the visible side, which is acceptable but shortens the fence life.
How many coats of stain does a fence need?
Two coats on new or weathered wood. One coat is only enough when you are refreshing a fence that was treated within the last few years.
Can I spray a fence instead of brushing it?
You can, and it is much faster, but overspray wastes 20-30 % of the product. Budget more stain and mask anything nearby.