# Fence Stain Calculator

URL: https://speedycalculator.com/calculators/construction/fence-stain/
Last updated: 2026-10-25

> The fence stain calculator estimates the gallons of stain or sealer for a wood fence from its length and height, fence style, number of sides and coats, and the coverage of the product, with the cost.

## Inputs

- Fence length (ft, m, in, yd, cm)
- Fence height (ft, m, in, yd, cm)
- Fence style
- Sides
- Coats
- Coverage
- Price (/US gal, /L)

## Results

- Area to stain
- Stain needed
- 1-gallon cans
- 5-gallon pails
- Cost (1-gallon cans)

## Formula

```
Area = length × height × style factor × sides
Gallons = area × coats ÷ coverage
```

## Explanation

A fence has more surface than its outline suggests: board-on-board and shadow-box fences have overlapping and edge surfaces, while open picket and split-rail fences have much less. Rough-sawn cedar and dry weathered wood absorb far more stain than smooth new boards, so use the lower coverage figure for those.

### How to use the Fence Stain Calculator

- **Fence length**
- **Fence height**
- **Fence style**
- **Sides**
- **Coats**
- **Coverage**
- **Price**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the fence length and height, choose the style, sides, coats, product coverage and price.

### Tips for an accurate estimate

- Keep units consistent – the calculator handles conversions, but check every field's unit before reading a result.
- Use values from standards, data sheets or test pieces whenever you have them; typical values are only a starting point.
- Apply appropriate safety factors and have structural, electrical and pressure work checked by a qualified professional.
- Record the inputs you used so the calculation can be reviewed later.

### Common mistakes to avoid

- Confusing diameter and radius, or nominal and actual sizes.
- Using allowable stresses and ultimate strengths interchangeably.
- Treating rule-of-thumb results as a substitute for code tables or an engineered design.

### Inputs explained

FieldWhat to enterFence lengthUnits: ft, m, in, yd, cmFence heightUnits: ft, m, in, yd, cmFence styleChoose one: Solid privacy (factor 1.0), Board-on-board (1.2), Shadow box (1.3), Picket with gaps (0.7) …SidesChoose one: Both sides, One sideCoatsA numberCoverageChoose one: Solid stain – 200 ft²/gal, Semi-transparent – 250 ft²/gal, Clear sealer – 300 ft²/gal, Rough-sawn / weathered – 150 ft²/galPriceUnits: /US gal, /L

### What each result means

- **Area to stain** = [Fence length]×[Fence height]×[Fence style]×[Sides]
- **Stain needed** = [Area to stain]×[Coats]÷[Coverage]
- **1-gallon cans** = ceil([Stain needed]÷0.003785411784 - 0.000001)
- **5-gallon pails** = ceil([Stain needed]÷0.01892705892 - 0.000001)
- **Cost (1-gallon cans)** = [1-gallon cans]×0.003785411784×[Price]

### Example values

How the main result changes when **Fence length** changes and everything else stays at the example values above:

Fence length (ft)Stain needed (US gal)754.5112.56.751509187.511.2522513.530018

## Worked example

Inputs — Fence length: 150 ft; Fence height: 6 ft; Fence style: Solid privacy (factor 1.0); Sides: Both sides; Coats: 1; Coverage: Solid stain – 200 ft²/gal; Price: $35 /US gal.

Results — Area to stain = 1,800 ft²; **Stain needed = 9 US gal**; 1-gallon cans = 9; 5-gallon pails = 2; Cost (1-gallon cans) = $315.00.

## FAQ

**How much stain for a 6 ft privacy fence?**
Each 100 ft of fence has 1,200 ft² of surface on both sides – about 6 gallons per coat at 200 ft²/gal.

**Should I spray or brush fence stain?**
Spraying is fast; back-brushing afterwards works the stain into the wood and evens the colour.

**How often should a fence be stained?**
Every 2–3 years for semi-transparent stains, 4–5 for solid colour.

**What formula does the Fence Stain Calculator use?**
Area = length × height × style factor × sides.