Roof Replacement Cost, Calculators, and Shopping List
Roofing is sold by the square, with one square covering 100 sq ft, and roof pitch can significantly increase the actual surface area. A 6/12 roof is 12% larger than its footprint.
Start with the roof pitch and roofing calculators, add gutters if needed, and price everything below.
Roof Replacement budget & shopping list template
- • Printable PDF checklist with quantities, estimated prices and an "Actual" column
- • Editable Excel or Google Sheets budget that calculates totals automatically, including contingency and remaining funds
- • Step-by-step plan and notes page
Which calculators do I need for this project?
Step 1
Roof Pitch Calculator
Convert roof pitch to angle and area multiplier.
Step 2
Roofing Calculator
Estimate roofing squares, bundles and underlayment.
Step 3
Metal Roofing Calculator
Estimate metal roofing panels, screws and ridge cap.
Step 4
Plywood Sheathing Calculator
Estimate 4×8 plywood or OSB sheets for any surface.
Step 5
Gutter Calculator
Estimate gutter length, downspouts and end caps.
Step 6
Snow Load Calculator
Estimate roof snow load in psf and total pounds.
How Much Does a Roof Replacement Cost?
20-square asphalt architectural shingle roof, 6/12 pitch. Estimated total: $4,942, or $5,436 with a 10% contingency.
| Item | Qty | Est. cost |
|---|---|---|
| Architectural shingles (bundle) | 66 bundles | $2,772 |
| Synthetic underlayment, 10 sq roll | 2 rolls | $220 |
| Ice & water shield, 2 sq roll | 4 rolls | $360 |
| Drip edge, 10 ft | 20 each | $180 |
| Starter strip (bundle) | 3 bundles | $135 |
| Ridge cap (bundle) | 4 bundles | $260 |
| Roofing nails, coil box | 3 boxes | $135 |
| Plywood sheathing (replacement) | 5 sheets | $160 |
| Roof vents & pipe boots | 1 lot | $120 |
| Dumpster / disposal | 1 each | $450 |
| Roofing nailer & safety harness | 1 kit | $150 |
Want this as a printable checklist and a self-totaling spreadsheet? Get the template.
What are the steps?
- Measure each plane and apply pitch factor.
- Tear off old roofing; replace rotten decking.
- Install drip edge and ice & water shield.
- Roll out underlayment with proper laps.
- Install the starter strip, field shingles, and flashing.
- Finish ridge vents and ridge cap.
How Many Bundles of Shingles Are in a Square?
Three bundles cover one square (100 sq ft) for most architectural shingles.
How much does a 2,000 sq ft roof cost in materials?
Asphalt architectural shingles run roughly $4,500 to $6,500 in materials for 20 squares.
How much waste should I add for roofing?
Add 10% for simple gable roofs and 15% for hips and valleys.
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