# Drywall patch calculator

> 1 patch + 7 small holes: 3 coats of compound and 2–3 days to dry, with the patches, spackle and primer counted. Spackle, patches, compound and primer for nail holes, dents, doorknob holes and bigger cut-outs, and how to make them disappear under paint.

## What to buy (1 patch + 7 small holes)

Every line shows the quantity to buy and how StudSheet got it: the spacing, the waste and the package size, so you can check it before the supply house or the quote.

| Buy | Material | How StudSheet counts it | What it is for |
|---|---|---|---|
| **1 tub** | Lightweight spackle (8 oz) | 6 nail or screw holes and 1 hole up to 2″ (about 10 nail holes’ worth each): one 8 oz tub fills about 140 nail holes, with what stays on the knife. | Fills nail holes and dings; sands easily. |
| **1 pack of 3** | Self-adhesive wall repair patches, 3-pack (6×6″, 3-pack) | 1 hole up to 4″: one 6×6″ patch each, at least 1″ bigger than the hole all around; 3 to a pack. | Mesh or metal patches that stick over a hole up to the size printed on the pack; three thin coats of compound hide them. |
| **1 bag** | Setting-type compound (20–45 min) (18 lb bag, 45-minute) | The first coat: it hardens in its listed time without shrinking. Mix small batches in a pan. | Hardens by chemistry, not drying — for cracks and bigger holes. |
| **1 tub** | All-purpose joint compound, 1 gal tub | Second and third coats: 1 × 0.05 gal = 0.05 gal. The smallest tub is plenty; it keeps for months closed. | Premixed lightweight compound for the coats over patches and tape: thin coats, overnight to dry, easy to sand. |
| **1 quart** | Stain-blocking primer, quart (stain-blocking) | Spot-prime every patch: compound soaks up paint differently and shows through it (flashing). | Seals patches so the compound doesn’t show through the paint (flashing). A small can spot-primes a lot of patches. |
| **1 quart** | Wall paint (match the wall and its sheen) | Enough for two coats on the patches. The can left over from the last paint job is best; otherwise have a chip color-matched. | Interior latex. |
| **1** | 4″ foam mini-roller | A small roller feathers touch-up paint so it blends; a brush leaves marks that show. | Smooth finish on doors and trim. |

### In Canada (1 patch + 7 small holes)

Set to Canada, the Sheet works the job out again for Ontario: metric sizes, bag sizes, the frost depth and the code notes. It doesn't just convert feet to meters. The first lines:

- **1 tub, Lightweight spackle:** 6 nail or screw holes and 1 hole up to 51 mm (about 10 nail holes’ worth each): one 236 mL tub fills about 140 nail holes, with what stays on the knife.
- **1 pack of 3, Self-adhesive wall repair patches, 3-pack:** 1 hole up to 102 mm: one 152×152 mm patch each, at least 25 mm bigger than the hole all around; 3 to a pack.
- **1 bag, Setting-type compound (20–45 min):** The first coat: it hardens in its listed time without shrinking. Mix small batches in a pan.
- **1 tub, All-purpose joint compound, 3.8 L tub:** Second and third coats: 1 × 0.2 L = 0.2 L. The smallest tub is plenty; it keeps for months closed.
- **1 × 946 mL, Stain-blocking primer, quart:** Spot-prime every patch: compound soaks up paint differently and shows through it (flashing).
- **1 × 946 mL, Wall paint:** Enough for two coats on the patches. The can left over from the last paint job is best; otherwise have a chip color-matched.

## The steps, in order

> **DIY OK: you can do this yourself with standard tools.** About 1–2 hours of work for this example.

1. Look behind each bigger hole for wires and pipes before you cut anything: a flashlight in the hole, or a wall scanner.
2. Small holes: press lightweight spackle in with a putty knife and scrape it flush. It shrinks a little, so add a second thin pass when the first is dry, then sand it smooth.
3. Doorknob-size holes: trim loose paper and crumbs, then stick a 6×6″ self-adhesive patch centered over each hole and press it flat.
4. First coat: setting-type compound (20 or 45 minute) over the patches and seams, pressed in and feathered 2–3″ past the mesh and tape. It hardens in its listed time without shrinking; mix only what you can use.
5. Second and third coats: premixed compound, each wider and thinner than the last; overnight between coats.
6. Sand: lightly with 120–150 grit, never into the paper; check each patch with a light held flat to the wall.
7. Prime: spot-prime every patch with stain-blocking primer; skip it and the patches show through the paint.
8. Paint: touch up with the same paint and sheen, feathered out with a small roller; if a patch still shows, paint the wall corner to corner.

## Tools (12)

Must-have tools first, then the ones that help and the ones to rent for the day.

| Tool | Need | Why |
|---|---|---|
| **Tape measure (25 ft)** | **Must have** | The red boxes every 16″ on the blade are stud spacing. |
| **Carpenter's pencil** | **Must have** | Flat, doesn't roll away, marks rough lumber. |
| **Putty knife** | **Must have** | Press spackle into small holes and scrape it flush |
| **6″ taping knife** | **Must have** | Coats over the patches and seams |
| **10–12″ taping knife** | Good to have | Feather the last coat wide and thin |
| **Mud pan** | **Must have** | Mix small batches of setting-type compound |
| **Utility knife + blades** | **Must have** | Trim torn paper and loose edges |
| **Sanding sponges** | **Must have** | Light sanding between and after coats, 120–150 grit |
| **Work light** | Good to have | Held flat to the wall, it shows every ridge before you paint |
| **N95 dust masks** | **Must have** | Sanding dust |
| **Safety glasses** | **Must have** | Every cut, every nail, every time. |
| **Paint tray** | Good to have | A small tray for the touch-up roller |

## Mistakes and how the math works

### Mistakes that cost a callback or a second trip

- **Thick coats of premixed compound:** They shrink, crack and take days to dry. Fill deep spots with setting-type compound, then thin premixed coats, each wider than the last.
- **No primer on the patches:** Compound soaks up paint differently, so the patches show as dull spots (flashing). Spot-prime every one.
- **A patch too small for the hole:** A self-adhesive patch needs at least 1″ of sound wall around the hole on every side, or its edges crack out.
- **Sanding into the paper:** Fuzzed paper shows through paint. Sand lightly; if you fuzz it, seal it with primer and skim it again.
- **Flat touch-up on an eggshell wall:** A different sheen shows from across the room even in the right color. Match the sheen, or paint the whole wall.
- **Cutting into a wire:** Outlets and switches have cables running up and down from them. Look in the hole or scan before you cut it bigger.

### What the calculator assumes

- Spackle: an 8 oz tub fills about 140 nail holes, a 32 oz tub about 570; a hole up to 2″ counts as 10 (estimates, with what stays on the knife).
- Self-adhesive patches cover a hole at least 1″ smaller all around: 6×6″ up to 4″, 8×8″ up to 6″.
- Large holes are squared 2″ bigger than the hole and filled with a piece on 4 backer clips; cut-outs go back to the middle of the studs, with 2×4 nailers top and bottom.
- New pieces come from the cheapest mix of 2×2 ft and 2×4 ft handy panels or 4×8 sheets at typical prices.
- Compound: setting-type for the first coat; premixed for two more, about 0.05 gal a doorknob patch, 0.15 gal a large hole and 0.02 gal per sq ft of cut-out (typical).
- Primer 300 sq ft/gal, paint 350 sq ft/gal per coat.

## Code, permits and safety

The Sheet sets its code notes for the job's state or province. These are New Jersey's and Ontario's; the [code reference](https://studsheet.com/codes) has more. Always confirm with your building department.

- **Permits:** a job like this usually needs none, but towns set their own rules. Ask your building department if you're not sure.

## Questions

### What materials do I need to patch a hole in drywall?

For the worked example, a 1 patch + 7 small holes, the Sheet counts 7 lines with waste included, starting with lightweight spackle (1 tub), self-adhesive wall repair patches, 3-pack (1 pack of 3), setting-type compound (20–45 min) (1 bag), all-purpose joint compound, 1 gal tub (1 tub). Each line's math is in the table above. Put in your own sizes in the [drywall patch calculator](https://app.studsheet.com/p/patch) and every line is counted again.

### How long does it take to patch a hole in drywall, and can I do it myself?

About 1 to 2 hours for the worked example, in 8 steps. StudSheet stamps it **DIY OK**: you can do this.

### What tools do I need to patch a hole in drywall?

12 in all. The must-haves start with tape measure (25 ft), carpenter's pencil, putty knife, 6″ taping knife, mud pan, utility knife + blades. On the Sheet you mark each one as owned, to buy or to rent.

## Ask about it

Stuck while you patch a hole in drywall? Ask in the [Drywall patches and cracks group](https://studsheet.com/forum/drywall-repair) of the StudSheet community with this Sheet attached. Homeowners who've done it and verified pros answer, and anyone can read it.

## More drywall Sheets

- **[Handyman for contractors](https://studsheet.com/trades/handyman)**: run this takeoff at your own prices, send the estimate, and get it signed and the deposit paid.
- **[Hang and finish drywall](https://studsheet.com/sheets/drywall)** (14′ × 12′ room): Sheets, screws, tape, compound and corner bead for walls and ceilings, finished to the level you want.
- **[All 45 Sheets](https://studsheet.com/sheets)**, across 16 trades.
- **[Code reference](https://studsheet.com/codes):** frost depths, guard heights, stairs, retaining walls.