Soffit, fascia & trim calculator
Soffit panels by overhang depth, fascia, F-channel, window and door casing, corner boards and trim coil.
Job
Eaves & rakes
Fascia & soffit
Window & door trim
Openings
Windows trimmed on
Corners, frieze & coil
Materials list
| Item | Qty | Unit price | Cost |
|---|---|---|---|
| Fascia | |||
| Fascia boards (1×6)160 LF | 11 pcs (16 ft) | $ | — |
| Soffit | |||
| Vinyl soffit, vented | 10 pcs (16 in. × 12 ft) | $ | — |
| Vinyl soffit, solid | 5 pcs (16 in. × 12 ft) | $ | — |
| F-channel (at the wall)160 LF | 15 pcs (12 ft 6 in.) | $ | — |
| Window & door trim | |||
| Casing boards (3.5 in.)218 LF, 46 pieces | 17 pcs (16 ft) | $ | — |
| Head flashing / drip cap | 7 pcs (10 ft) | $ | — |
| Corner boards (2 per corner)4 corners × 10 ft | 9 pcs (16 ft) | $ | — |
| Coil, fasteners & sealant | |||
| Colored trim nails, 1-1/4 in.≈ 146 nails | 1 lb | $ | — |
| Galvanized / stainless trim nails, 8d≈ 688 nails | 7 lb | $ | — |
| Paintable caulk | 8 tubes | $ | — |
How it works
- Soffit panels are cut across the overhang: a 12 ft panel gives as many pieces as fit at your depth, 16 in. wide each.
- Casing and corner boards are planned piece by piece onto your board length, so short offcuts get used before a new board is started.
- Trim coil: strips per roll = 24 in. ÷ blank width, each 50 ft long.
- Add your supplier's unit prices to any line for a cost estimate; tax and markup are optional.
How to measure
- Eave and rake lengths along the fascia; soffit depth from the wall to the back of the fascia.
- Openings: outside of the frame in inches. Corner height from the bottom of the siding to the soffit.
Estimates only. Coverage, sizes and waste vary by product and job — verify with the manufacturer's specs and your local building code before ordering.
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