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Most contractors use "markup" and "margin" interchangeably — and lose real money doing it. A 50% markup is NOT a 50% margin. This calculator converts between the two so you can stop guessing and start pricing correctly.

Markup adds to cost (Cost × (1 + markup%) = Price). Margin is the profit as a % of the selling price (Profit ÷ Price = margin%). A 50% markup gives you a 33.3% margin. A 50% margin requires a 100% markup. Get this wrong on every job and it adds up fast.

A quick way to estimate linear feet of pipe needed for a project, with a built-in waste factor so you don't run short on the second day. Works for PEX, copper, CPVC, or any other linear pipe material.

This is a quick field estimate — not a takeoff. Every job has its own twists, turns, and obstructions. Use this for "how much should I throw on the truck" decisions, not for bid-grade material lists. Manifold-and-home-run systems use roughly 30% more pipe than trunk-and-branch.

A rough cooling capacity estimate based on square footage and climate zone. Useful for the first conversation with a customer or sanity-checking an existing system size — but it does not replace a Manual J load calculation, which is what you actually need before installing equipment.

This is a rough sanity check, NOT a Manual J load calculation. Real sizing accounts for orientation, window area & type, ceiling height, infiltration rates, internal loads, ductwork condition, and dozens of other variables. Install equipment based on a Manual J — never on a quick estimate. Oversized AC equipment short-cycles, fails to dehumidify, and burns out compressors. Undersized equipment runs constantly. Both are bad.

Convert roof square footage into bundle counts for asphalt shingles, with a built-in waste factor. Three bundles = one square (100 sq ft of coverage) for standard 3-tab and architectural shingles.

This calculates field shingles only. You'll also need: starter strip (2 bundles per 100 lf eave), ridge cap (1 bundle per 35 lf of hip/ridge for cap shingles, or 1 bundle per 100 lf for cut shingles), drip edge, ice & water shield (typically 3 ft up from eaves and in valleys per IRC), underlayment, and fasteners. Always order one extra square beyond the calculation for repairs and replacements down the road.

A clean, printable Excel template for residential panel schedules. Three sheet sizes included for the most common configurations: 24-circuit, 30-circuit, and 42-circuit. Standard residential layout (odd circuits left, even right) so it matches what's on the panel and what the inspector expects.

Excel (.xlsx) · Compatible with Excel, Google Sheets, Numbers, and LibreOffice · ~12 KB

This template is a labeling reference — not a load calculation tool. Sizing breakers, conductors, and the panel itself requires NEC load calculations and is your responsibility as the licensed installer. Always verify against the current adopted NEC edition and your local AHJ.