Interior Door Cost Calculator
Estimate the total cost of interior doors for your project.
Choose door type and hardware to get a complete budget including installation.
Door quantity estimation calculates the number of interior and exterior doors needed for a residential or commercial building project. Getting this right early prevents costly mid-construction material shortages and budget overruns.
Core formula: Total Doors = Exterior Doors + Interior Doors Interior Doors = Total Interior Doorways (per floor plan room count)
Rule-of-thumb estimating formulas: Interior Doors (residential) ≈ Number of Rooms + Number of Bathrooms + 1 (for each closet) Exterior Doors (residential) ≈ 1 front + 1 rear + 1 per garage bay + 1 per basement access
What each variable means:
- Exterior Doors — entry/egress doors exposed to weather. These require higher-grade materials: solid core, weatherstripping, and reinforced frames. Standard sizes: 36" × 80" (main entry), 32" × 80" (secondary).
- Interior Doors — interior passage doors. Standard hollow-core doors work for most interior applications. Standard size: 28"–32" × 80"; bathroom: 28" × 80"; bedroom: 30"–32" × 80".
- Closet Doors — bifold or bypass (sliding) doors. One opening may require 2 door panels.
- Pocket Doors — recessed into the wall. Count the wall rough opening, not door panels.
Standard residential door counts by home size:
| Home Size | Typical Exterior Doors | Typical Interior Doors | Total |
|---|---|---|---|
| 1,000 sq ft (2BR/1BA) | 2–3 | 6–8 | 8–11 |
| 1,500 sq ft (3BR/2BA) | 3–4 | 9–12 | 12–16 |
| 2,500 sq ft (4BR/3BA) | 4–5 | 14–18 | 18–23 |
| 3,500 sq ft (5BR/4BA) | 5–6 | 18–24 | 23–30 |
Worked example: A 2,200 sq ft single-story home with: 3 bedrooms, 2 bathrooms, kitchen, dining room, living room, laundry room, 2 bedroom closets, 1 linen closet, 2-car garage.
Exterior: front entry (1) + back door (1) + garage man door (1) = 3 exterior doors Interior room doors: 3 bedrooms + 2 bathrooms + laundry = 6 doors Closet doors: 2 bedroom closets + 1 linen = 3 openings (6 bifold panels) Total door openings: 12 openings (not counting closet panels separately)
Budget note: Hollow-core interior doors: $60–$200 each. Solid-core interior doors: $150–$500 each. Exterior entry doors: $300–$3,000+ depending on material and style.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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