A published “$950 a square” special prices the roof after pitch. A residential metal roof is not that number. It is a panel type that does not scale with squares, a tear-off or an overlay, one story or two, and lineal feet of ridge, hip, valley, rake, and eave the coupon never counted. Matching the coupon on a 10/12 mechanical-lock standing-seam tear-off is how a sold job becomes a week of unpaid seamer time after the first valley.
Open the free bid calculatorTake a 40×30 ranch at 4/12, 5V crimp, overlay, four pipe boots, no snow guards. That is 1,200 plan square feet, 1,264.8 roof square feet, and 12.65 squares — 13.66 panel squares after 8% waste. The coupon says about $10,750. Raise the same shop to a 50×40 two-story at 10/12. The plan is 2,000 square feet, so the coupon says about $22,130 on 26.04 squares. The job did not scale that way: mechanical-lock panels, a seamer, a full tear-off, 84 lineal feet of hip and valley, and 48 snow guards the ranch never had.
Put standing seam on that ranch. Panels now cost more per square the 5V overlay never priced. Two stories are not “the same squares plus a ladder.” A valley is not in the square number at all.
The metal roof bid calculator does that arithmetic in the browser from your own hours and invoices. Starting waste, hours, and material rates are ballpark figures to replace, not a catalog or a code table.
This is not a building-code opinion, a permit, a construction specification, or an engineering stamp. Confirm the jurisdiction and a qualified professional before sending a price. The output is arithmetic on the numbers you typed.
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Start from the building plan, apply the pitch to get roof squares, then count panel squares after waste, tear-off, stories, trim, snow guards, and the permit. A published $950 per square special only sees roof squares after pitch.
A 40-by-30 ranch at 4/12 is 12.65 squares of 5V overlay. A 50-by-40 two-story at 10/12 is 26.04 squares of mechanical-lock standing seam, a full tear-off, valleys, and snow guards. Matching the ranch coupon is how the standing-seam job loses money.
No. Pitch multipliers, waste, and panel rates here are common starting points on residential bids. They are not a building-code opinion, a permit, or an engineering stamp.