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Deck Staining Calculator — How Much Stain Do You Need?

Get your stain, supplies, and cost estimate

Total DIY Cost

$245

Gallons

4

Total Area

400 sq ft

Stain Cost

$168

Units
Has Railings
Has Stairs
Total Area

400 sq ft

Gallons

4

Stain Cost

$168

Supplies

$77

DIY vs. Professional

DIY Staining$245
Professional$1,800
Save $1,555 DIY!(86% less)

Example Calculations

1Standard Deck (20 x 14 ft) with Railings

Inputs

Deck Length20 ft
Deck Width14 ft
Railings40 linear ft
Stain TypeSemi-Transparent
Coats2

Result

Stain Needed4 gallons
Deck Area280 sq ft
Railing Area120 sq ft
Total Area400 sq ft
Stain Cost$168
Supplies Cost$77
Total DIY Cost$245
Professional Cost$1,800

Deck area = 20 x 14 = 280 sq ft. Railing area = 40 x 3 = 120 sq ft. Total = 400 sq ft. With 2 coats at 250 sq ft/gal: ceil((400 x 2) / 250) = ceil(3.2) = 4 gallons at $42/gal = $168. Supplies: cleaner $30, brushes $25, tape $6, drop cloths $16 = $77. Total DIY = $245 vs. professional at $4.50/sq ft = $1,800.

2Small Deck (12 x 10 ft) No Railings

Inputs

Deck Length12 ft
Deck Width10 ft
RailingsNone
Stain TypeClear Sealer
Coats2

Result

Stain Needed1 gallon
Deck Area120 sq ft
Total Area120 sq ft
Stain Cost$35
Supplies Cost$48
Total DIY Cost$83
Professional Cost$540

Deck area = 12 x 10 = 120 sq ft. No railings or stairs. With 2 coats at 300 sq ft/gal: ceil((120 x 2) / 300) = ceil(0.8) = 1 gallon at $35/gal = $35. Supplies: cleaner $15, brushes $25, drop cloths $8 = $48. Total DIY = $83 vs. professional at $4.50/sq ft = $540.

3Large Deck (24 x 16 ft) with Railings and Stairs

Inputs

Deck Length24 ft
Deck Width16 ft
Railings60 linear ft
Stairs8 steps
Stain TypeSolid Stain
Coats2

Result

Stain Needed6 gallons
Deck Area384 sq ft
Railing Area180 sq ft
Stair Area24 sq ft
Total Area588 sq ft
Stain Cost$282
Supplies Cost$125
Total DIY Cost$407
Professional Cost$2,646

Deck area = 24 x 16 = 384 sq ft. Railing area = 60 x 3 = 180 sq ft. Stair area = 8 x 3 = 24 sq ft. Total = 588 sq ft. With 2 coats at 200 sq ft/gal: ceil((588 x 2) / 200) = ceil(5.88) = 6 gallons at $47/gal = $282. Supplies: cleaner $45, brushes $50, tape $6, drop cloths $24 = $125. Total DIY = $407 vs. professional at $4.50/sq ft = $2,646.

Frequently Asked Questions

Q

How much deck stain do I need?

Calculate your total deck area (length x width) plus railings and stairs. Divide by coverage per gallon (200-300 sq ft depending on stain type) and multiply by the number of coats. A 280 sq ft deck with 2 coats of semi-transparent stain needs about 3 gallons.

  • Deck area = length x width in sq ft
  • Add railing area: linear feet x 3 sq ft per foot
  • Add stair area: number of stairs x 3 sq ft each
  • Divide total area by coverage rate per gallon
  • Multiply by number of coats (usually 2)
Stain TypeCoverage (sq ft/gal)Coats Needed
Clear Sealer3002
Semi-Transparent2502
Solid Stain2002
Deck Paint2752
Q

How often should you restain a deck?

Most decks need restaining every 2-3 years with semi-transparent stain, or every 4-5 years with solid stain. Clear sealers wear fastest at 1-2 years. Sun exposure, foot traffic, and climate affect how quickly stain breaks down.

  • Clear sealer: every 1-2 years
  • Semi-transparent stain: every 2-3 years
  • Solid stain: every 4-5 years
  • Deck paint: every 5-7 years
  • South-facing decks wear faster from UV exposure
Q

Should I use semi-transparent or solid stain?

Semi-transparent stain lets wood grain show through and is best for new or good-condition wood. Solid stain covers completely like paint and is ideal for weathered or previously stained decks. Semi-transparent is easier to maintain, while solid provides more UV protection.

FeatureSemi-TransparentSolid Stain
Wood grain visibleYesNo
Coverage per gallon250 sq ft200 sq ft
Longevity2-3 years4-5 years
Best forNew/good woodWeathered/old wood
Peeling riskLowModerate
Q

What temperature is best for staining a deck?

Stain your deck when temperatures are between 50-90 degrees F with no rain expected for 24 hours. Humidity should be below 85%. Avoid direct sunlight during application, as it causes the stain to dry too quickly and leads to lap marks.

  • Temperature: 50-90 degrees F
  • No rain for 24 hours before and after
  • Humidity below 85%
  • Avoid direct midday sun during application
  • Morning or late afternoon application is best
Q

Do I need to strip old stain before restaining?

Not always. If the existing stain is in good condition, cleaning and light sanding may be enough. Weathered stain that has faded evenly can often be recoated directly. Peeling or flaking stain must be stripped completely before applying new stain to ensure proper adhesion.

  • Good condition: clean, light sand, then restain
  • Weathered/faded: clean, sand, brighten, then restain
  • Peeling/flaking: strip, sand, clean, then restain
  • Never apply new stain over peeling old stain
  • Deck brightener restores wood pH after cleaning

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Last Updated: Mar 9, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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