Quarter Round Calculator

• Net run per room = max(Perimeter − Openings, 0)
• Total net run = Σ(Net run per room)
• Corner allowance = (Inside corners + Outside corners) × Allowance per corner
• Base required = Total net run + Corner allowance
• Required with waste = Base required × (1 + Waste% / 100)
• Pieces needed = ceil(Required with waste ÷ Stock piece length)
• Leftover = Pieces needed × Stock piece length − Required with waste
• Material cost = (Pieces × Cost per piece) or (Required × Cost per unit)
• Labor hours = Required ÷ Install speed, then Labor cost = Hours × Rate
• Grand total = Subtotal + Tax − Discount

1. Select a unit system, then keep all lengths consistent.
2. Add each room with its perimeter and total openings.
3. Enter waste percent and optional corner allowance values.
4. Set stock length and your preferred pricing method.
5. Optional: enter labor rate, speed, tax, and discount.
6. Press Submit to see quantities, costs, and a room cut plan.
7. Use the download buttons to export CSV or PDF.

1) What quarter round does on site

Quarter round molding covers small gaps where flooring meets baseboard, especially with laminate and hardwood. It protects edges, hides uneven cuts, and improves finish quality. Accurate takeoffs reduce store trips, keep crews moving, and prevent visible joints at high-traffic corners.

2) Measuring perimeters with fewer mistakes

Measure each wall run at the floor line and record a room perimeter. Subtract openings such as doorways where trim is not installed. For remodels, verify that baseboards are continuous and confirm if quarter round wraps into closets or stops at transitions.

3) Openings, transitions, and stop points

Openings are not always “zero trim” zones. Some details require returns, stop blocks, or short pieces. Treat those as small add-backs if your standard includes them. The calculator uses a simple perimeter-minus-openings model, then lets waste and corner allowance cover field adjustments.

4) Waste percentage as a planning tool

Waste is driven by piece length, room geometry, and miter frequency. Straight runs with few corners may work at 8–10%. Complex rooms, tight miters, or stain-grade trim often need 12–15%. When stock length is short, waste rises because more joints are required.

5) Corner allowance and miter reality

Inside and outside corners typically consume extra length due to test cuts, blade kerf, and fit-up. Adding a small allowance per corner creates a buffer without inflating waste too far. When you track actual usage, you can set a consistent corner allowance for your crew and tools.

6) Converting required length to pieces

Ordering is based on whole pieces, not fractional lengths. The calculator divides required length by your stock piece length and rounds up to a full count. Leftover is shown so you can decide whether to standardize piece lengths, improve cut planning, or hold surplus for future punch work.

7) Costing with per-piece or per-length pricing

Suppliers may sell quarter round by the piece, by the bundle, or by linear measure. Per-piece pricing works well when lengths are fixed; per-length pricing is useful when you price by installed run. Labor can be estimated using install speed, helping you compare subcontract quotes to in-house production.

8) Using the room cut plan for coordination

The room plan allocates the total required length back to each room, including waste and corner allowance, in proportion to net run. This supports staging: deliver the right quantity to each area, mark bundles, and reduce handling. Update the table when scope changes, then export a CSV or PDF for field use.

1) Should I measure walls or finished floor edges?

Measure at the floor line where the molding will sit. If walls bow or floors wave, measure the actual run rather than relying on drawings, and keep units consistent across all inputs.

2) Do I subtract doorway widths as openings?

Yes, subtract openings where quarter round will not be installed. If you plan return blocks or short returns at the baseboard, add a small allowance or increase waste slightly.

3) What waste percent is common for trim work?

For simple rooms, 8–10% is often adequate. For many corners, stain-grade work, or short stock lengths, 12–15% is safer. Track actual usage to refine your standard.

4) How do I choose the corner allowance?

Use a small buffer per corner for test cuts, kerf, and fit. Start with 0.10 ft or 0.03 m and adjust based on crew habits and saw accuracy over several jobs.

5) Why does the calculator round up pieces?

Suppliers sell full pieces, and installation requires full stock to cut from. Rounding up prevents shortages. The leftover value helps you plan joints, storage, and potential reuse.

6) Can I estimate nails or fasteners accurately?

The fastener estimate divides required length by your spacing and rounds up. It is useful for ordering, but field needs vary by substrate, adhesive use, and manufacturer recommendations.

7) Does this replace a detailed cut list?

No, it provides a reliable quantity and cost plan. For premium finishes, create a cut strategy to minimize joints and match grain. Use the room allocation to stage materials efficiently.