Commercial roofing runs on narrow margins, and a quick material-takeoff tool shouldn't be locked behind expensive enterprise software. We built this calculator — free, with no login and no usage limits — for anyone working on or planning a commercial low-slope roof.
Whether you buy from Essential Roofing Supply or not, we hope the tool helps you plan faster and compare proposals with more confidence. It's a work in progress; we're iterating on it based on user feedback.
Thanks for supporting a free and open project — your feedback is what makes it better.
Found a bug? Have a suggestion? Noticed numbers that don't match your on-site experience? Send us a note — we read every one.
Essential Roofing Supply awards $25, $50, or $100 gift cards at our sole discretion to users whose feedback helps improve the calculator. No formal program, no hoops, no purchase necessary — just tell us what you found and how we can reach you.
Draw, configure, and get an estimate in a few minutes. No CAD software, no spreadsheets, no installation.
Search your project address, then trace the roof perimeter with the polygon tool. Add drains, penetrations, curbs, and cutouts for skylights or courtyards. Edge lengths display in feet and inches as you draw.
Pick the membrane (TPO, EPDM, or PVC), thickness (45, 60, or 80 mil), attachment method (mechanically attached, fully adhered, induction-welded, or ballasted), insulation type, cover board, deck substrate, and FM wind rating (1-60 through 1-210).
The calculator produces a categorized estimate — insulation fasteners and plates, membrane seam fasteners, bonding adhesive, termination bar, coverstrip, T-joint covers, and perimeter sheets — and shows live Essential Roofing Supply pricing on the items we stock.
Save the project for later, share the estimate with your customer, or compare it against a licensed engineer's takeoff. Always route warranty-critical numbers through the manufacturer's technical services team before ordering materials.
The calculator's defaults were informed by the following publicly available manufacturer specifications, installation manuals, and FM Global wind-design documents. Naming a manufacturer below is a source citation, not an endorsement.
Sure-Weld TPO, Sure-Flex PVC, Sure-Seal EPDM, and Sure-Tough reinforced EPDM. Math defaults were informed by the publicly available Sure-Weld TPO Code Approval Guide (document 600163) and HP-X / HP-Xtra fastener-plate product data sheets.
JM TPO, JM EPDM (reinforced and non-reinforced), JM PVC, and the JM FIT lines. Adhesive coverage, fastener density, and half-sheet handling were informed by JM's publicly posted technical bulletins T20-002, T20-003, T24-005, and T24-008.
UltraPly TPO, RubberGard EPDM, and Elevate PVC. Adhesive coverage uses Elevate's published 45 sf/gal finished rate; attachment guidance was informed by the public UltraPly Attachment Guide (doc 166874) and the RubberGard Design Guide.
TremPly TPO single-ply system. General installation conventions were cross-referenced against Tremco's publicly available TPO Installation Manual for side-lap, end-lap, and perimeter securement practices.
IKO Innovi TPO single-ply system. Fastening and installation practices were cross-referenced against IKO's publicly available Single-Ply TPO Installation Manual and the 3-Part CSI Specification for mechanically attached TPO roofing.
The Garland Company, BiTec (historically modified bitumen, now expanding into TPO single-ply), and other manufacturers' publicly available documentation may inform future updates to the calculator. If you work with a manufacturer not listed here and would like its defaults supported, email us — we'll consider adding it when we can locate authoritative public documentation.
Supported attachment methods: mechanically attached (in-seam fasteners and plates), fully adhered (bonding adhesive over insulation), induction-welded (e.g. RhinoBond / InvisiWeld plate systems), and ballasted (EPDM with min. 10 psf rounded gravel or 18 psf standard pavers per ANSI/SPRI RP-4).
Anyone who needs a quick, source-cited commercial roofing material estimate — at any experience level.
Sketch a quick takeoff during a site visit. Generate a starting estimate without pulling a full estimator off another job. Always verify against field measurements and manufacturer review.
Produce a sanity-check estimate that references published manufacturer documents and FM Global wind guidance. Compare against your own takeoff before finalizing a bid.
Get a rough scope before soliciting formal bids. Compare contractor proposals against an independent, source-cited estimate.
Cross-check fastener densities and assembly choices against publicly available manufacturer specifications and FM Global Data Sheets 1-28 and 1-29.
The calculator's logic references the following publicly available industry documents. Essential Roofing Supply is not affiliated with any of the publishing organizations.
Essential Roofing Supply is a commercial roofing hardware company based in Wall Township, New Jersey, serving contractors across the United States with free shipping on insulation fasteners, seam plates, and commercial roofing accessories. We publish this calculator as a free planning tool for the industry.
Questions, quotes, or bulk orders: customerservice@essentialroofingsupply.com · essentialroofingsupply.com
