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8x10 Shed Floor Calculator

Joists, plywood sheets, and cost for an 8x10 shed floor.

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Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.

Try a scenario

Click to load — tweak from there.

Inputs

Result

Plywood sheets needed

3

Floor joists needed

7

Estimated material cost

$233

Floor square footage

80

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How to use this

  1. 1Enter floor length (ft).
  2. 2Enter floor width (ft).
  3. 3Enter joist spacing (in).
  4. 4Enter price per joist ($).
  5. 5Enter price per 4x8 plywood sheet ($).
  6. 6Enter waste factor (%).
  7. 7Read your plywood sheets needed on the right — it updates as you type.
  8. 8Hit Share to keep the scenario or send it to someone.

About this calculator

An 8x10 shed floor is small enough to frame from a single delivery of lumber. This calculator defaults to 8x10 with 16-inch joist spacing and 4x8 plywood decking, returning the joist count, plywood sheet count, and total material cost.

FormulaJoists = (Length ÷ Joist Spacing) + 1. Sheets = Ceil(Floor Area ÷ 32) × (1 + Waste%). Cost = Joists × Joist Price + Sheets × Sheet Price.

Worked example

Using the values the calculator loads with:

Inputs

  • Floor length: 10 ft
  • Floor width: 8 ft
  • Joist spacing: 16 in
  • Price per joist: 14 $
  • Price per 4x8 plywood sheet: 45 $
  • Waste factor: 10 %

Results

  • Plywood sheets needed: 3
  • Floor joists needed: 7
  • Estimated material cost: $233
  • Floor square footage: 80

What each field means

Inputs

Floor length (ft)
The floor length used in the calculation, measured in ft. Starts at 10 ft so you have a working example on load.
Floor width (ft)
The floor width used in the calculation, measured in ft. Starts at 8 ft so you have a working example on load.
Joist spacing (in)
The joist spacing used in the calculation, measured in in. Starts at 16 in so you have a working example on load. Accepted range: 12–24 in.
Price per joist ($)
The price per joist used in the calculation, measured in $. Starts at 14 $ so you have a working example on load.
Price per 4x8 plywood sheet ($)
The price per 4x8 plywood sheet used in the calculation, measured in $. Starts at 45 $ so you have a working example on load.
Waste factor (%)
The waste factor used in the calculation, measured in %. Starts at 10 % so you have a working example on load. Accepted range: 0–30 %.

Results

Plywood sheets needed
Returned as a whole number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Floor joists needed
Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Estimated material cost
Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Floor square footage
Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.

FAQ

How many sheets of plywood for an 8x10 shed floor?

80 square feet divided by 32 square feet per sheet is 2.5, so with waste you typically need 3 sheets of 3/4-inch tongue-and-groove plywood.

What thickness plywood is best for a shed floor?

3/4-inch tongue-and-groove is standard for shed and cabin floors since it resists sagging between joists better than thinner sheathing.

Should the shed floor sit on skids or a concrete pad?

Skids (pressure-treated 4x4 or 4x6 runners) are common for portable sheds; a concrete pad is better for permanent structures. This calculator covers the wood floor system either way.

Accuracy and limitations

  • Estimates assume standard, average conditions — local rules, pricing, and materials vary.
  • Results are rounded for readability; add a buffer before ordering, booking, or committing.
  • Double-check anything with a real cost attached against a local quote.

Related tools

4x8 Shed Pad Concrete Calculator

Concrete needed for a small 4x8 shed or generator pad, bag count included.

10x12 Shed Calculator

Floor, wall, and roof material estimates for a 10x12 storage shed.

Cite this calculator

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APA
RevenueLab. (2026). 8x10 Shed Floor Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/8x10-shed-floor-calculator
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<p>Source: <a href="https://www.revenuelab.fyi/toolbox/8x10-shed-floor-calculator" target="_blank" rel="noopener">8x10 Shed Floor Calculator — RevenueLab</a> (2026).</p>
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Source: [8x10 Shed Floor Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/8x10-shed-floor-calculator) (2026).
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