Flooring calculator

Subfloor

Tongue-and-groove subfloor sheet count from floor area and the face of one panel.

Reviewed formula · v1.0.0

Project inputs

Enter field measurements. Imperial lengths take feet and inches. Unit conversion happens before the reviewed formula is applied.

Floor lengthft + inFinished floor lengthftinFloor widthft + inFinished floor widthftinSheet coverageft²Face of one panel. A 4×8 T&G sheet is 32 ft²Waste factor%Allowance for layout, stair openings and offcuts

All values can be refined when you edit the estimate. This tool does not replace field verification or local requirements.

Calculated result

11sheets

Sheets to order

FormulaFLR-SUB-001

L × W × (1 + waste) ÷ sheet coverage

320 ft²

Floor area

352 ft²

Area including waste

Transparent cost view

Planning rates only. Pick a currency — badges, inputs, and totals follow. Material is a rate. Labour is hours × a planning hourly rate. Equipment and delivery are this-job amounts.

Material ratePlanning · per calculated unit · USDEquipmentPlanning · this job · USDDeliveryPlanning · this job · USDLabour hoursPlanning · this jobLabour ratePlanning · per hour · USDOverhead %%Contingency %%Markup %%Tax %%

Planning defaults are office figures, not a bid. US ready-mix in 2026 often lands around $125–165 per cubic yard delivered; place-and-finish commonly $2–4 per square foot. Replace every rate with a supplier or crew quote before you send the letter.

Indicative FX as of Aug 2026. Planning conversion, not a live bank rate.

Material costUSD 935

Labour (8 h)USD 280

Direct costUSD 1,325

Overhead + contingencyUSD 133

Markup + taxUSD 175

Estimated project totalUSD 1,632

View estimate Quote / invoice Add another item

Embed this calculator

<iframe src="https://construclytic.com/embed/subfloor" title="Subfloor" width="100%" height="820" loading="lazy" referrerpolicy="strict-origin-when-cross-origin" style="border:1px solid #d7e0da;border-radius:16px;background:#fff;"></iframe>

Paste on a contractor site or blog. The iframe is a planning takeoff, not a bid.

How this calculator works

A transparent subfloor takeoff.

Floor length times width, divided by the face of one T&G panel, with a layout allowance before whole-sheet rounding.

Worked example. Example: a 20 × 16 ft floor at 32 ft² per 4×8 sheet with 10% waste rounds to 11 sheets.

1. Measure the framed floor, including closets.
2. Enter 32 for a 4×8 T&G panel. Do not mix 4×8 and 4×10 on one takeoff.
3. Adhesive, screws and blocking are separate lines.

Need the broader workflow? Read the flooring planning guide.

Questions

Questions about subfloor

Why not use sheet goods?

You can. This page exists because “subfloor calculator” is how most people search, and the copy talks T&G layout instead of generic plywood.

Stair opening?

Deduct it in waste on a small floor, or split the takeoff so the opening does not order a phantom sheet.

What is the formula ID?

This calculator publishes formula FLR-SUB-001, version 1.0.0. The ID stays on the result and on the estimate line.

Is this engineering advice?

No. Construclytic is a planning website, not a registered engineering or contracting firm. Field checks, codes and product data still sit with you.

Does Construclytic fetch live supplier prices?

No. Costs use the rate you enter. Construclytic does not fetch live supplier prices.