How Much Paint for a Fence Calculator
Wondering how much paint for a fence you actually need? This free fence paint calculator turns your fence's length, height, sides, coats, and coverage rate into the gallons (and quarts) to buy — rounded up, with a waste allowance included.
Enter your numbers
Your results
| Total square footage | — |
| Area with coats applied | — |
| Exact gallons before waste (estimate) | — |
| Gallons with waste (estimate) | — |
| Quarts equivalent (estimate) | — |
Estimates: rough-sawn or weathered wood can need 30–50% more paint than the can's label coverage — lower the coverage number above for old, thirsty fences.
How to use this calculator
Measure your fence's length and height in feet and enter them above. Choose one or both sides — neighbors usually split a shared fence, so pick one side if you’re only painting yours. Pick 2 coats for paint or 1 coat for stain, then set the coverage rate from your can (most exterior paints list 250–350 sq ft per gallon) and a waste factor of 10% for brush work or 15–20% for spraying. Results update instantly.
When in doubt, lower the coverage number: pickets, railings, and rough-sawn boards all drink more per square foot than the flat-smooth wood the label assumes, and dark colors over a light primer may need an extra coat’s worth of product.
How it works
The math is straightforward: gallons = length × height × sides × coats ÷ coverage × (1 + waste%). A 100 ft × 6 ft fence painted on both sides is 100 × 6 × 2 = 1,200 sq ft; at 300 sq ft per gallon, one coat needs 1,200 ÷ 300 = 4 gallons.
Coverage varies because wood absorbs paint rather than just letting it sit on the surface. The can’s rated coverage assumes new, smooth boards — rough-sawn, weathered, or previously unpainted wood can need 30–50% more paint than the label says. So all outputs here are estimates: the calculator multiplies your exact requirement by your waste factor and rounds up to whole gallons (or quarts for small jobs), since paint is sold in full cans. On a big weathered fence, consider buying one extra can beyond the rounded number.
Frequently asked questions
How much paint do I need for a 100 foot fence?
A 100 ft long, 6 ft tall fence painted on both sides has 1,200 square feet of surface. At 300 sq ft per gallon, one coat needs 4 gallons and two coats of paint need 8. With a 10% waste allowance that is 8.8 gallons, so buy 9 gallons. If you are only painting your side, halve those numbers.
How much paint does a fence need per square foot?
About 1/300 of a gallon per square foot per coat, based on typical coverage of 250–350 sq ft per gallon for exterior paint and solid stain. Rough-sawn or weathered wood can need 30–50% more paint than the can's label coverage, so set a lower coverage number for old, thirsty fences.
Should I use paint or stain on a wood fence?
Stain is usually the better choice for wood fences: it soaks into the grain instead of sitting on top, so it doesn't peel and is easier to recoat. Paint gives richer, more uniform color and works well on older fences, but it needs primer and must be scraped and sanded when it eventually flakes. Solid-color stain splits the difference, hiding weathered grain with near-paint color.
How many coats of paint does a fence need?
Two coats for paint, with the first being primer on bare or weathered wood — or two coats of self-priming paint. For stain, one coat is often enough for a maintenance recoat, while new or weathered wood usually gets two. Skipping the second coat to save money almost always costs more later: coverage and UV protection per gallon drop sharply on thin single coats.
Can I spray paint a fence instead of brushing?
Yes — a pump sprayer or airless sprayer paints a fence much faster, especially pickets and railings. Budget 10–20% extra paint for overspray, and back-brush (work the sprayed paint into the wood with a brush) right after spraying for better adhesion. Keep the waste factor at 15–20% in this calculator when you spray.