SettingsSettings for this calculationUS
The roof's sloped surface area in square feet.
Measure along the slope, or multiply the plan area by the pitch multiplier for your roof angle. Plan area alone will understate a pitched roof.
Roofing squares
20 squares
1 square = 100 sq ft, so square feet ÷ 100 gives squares. Round up for ordering, but keep the exact figure when comparing per-square quotes.
- Conversion factor applied
- 0.01 squares per sq ft
They open the calculator with your figures already in it
Square Feet to Roofing Squares Calculator: 20 squares — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- A roofing square is 100 square feet of roof surface area
Inputs used
- Roof surface area (sq ft)
- 2000
Intermediate steps
- Conversion factor applied
- 0.01 squares per sq ft
Confidence note: 1 square = 100 sq ft, so square feet ÷ 100 gives squares. Round up for ordering, but keep the exact figure when comparing per-square quotes.
Estimated cost — your price
This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-08-26 · in the site-wide review of 2026-09-06 · v1.0.0
Regulatory standards & verification citations1
- A roofing square is 100 square feet of roof surface area
Cite this page
Your workspace
Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.
Once a roof has been measured, converting to squares is what lets the number be priced, because every supplier catalogue and every roofing quote is denominated that way. Dividing by a hundred is trivial; the judgement is in what area you divide. The figure must be sloped surface area, obtained either by measuring along the rafter line or by applying a pitch multiplier to the plan area. Round up for ordering, since bundles and underlayment rolls do not come in fractions, but keep the unrounded figure when comparing quotes priced per square — the difference between 21.4 and 22 squares is real money on a large roof, and a contractor will be pricing the former.