Construcción

Door Hinge Calculator: How Many Hinges and Screws Do You Need?

Q: How many screws does a door hinge need?

A standard residential butt hinge has **2 holes per leaf × 2 leaves = 4 screws per hinge**. Heavy-duty or ball-bearing hinges (4″ / 100 mm) often have **3 holes per leaf × 2 = 6 screws**. Commercial-grade hinges can use **4 holes per leaf × 2 = 8 screws**. Always fill every hole — omitting screws concentrates load on fewer points and causes premature wear and door sag.

Q: What size screws should I use for door hinges?

For standard residential interior doors: **#8 × 1¼″ flat-head wood screws** (coarse thread). For exterior or solid doors: **#8 × 2" or #10 × 2½"** to reach the structural framing. Security/exterior doors: at least one screw per leaf should be **3" long** to reach the stud behind the casing — this dramatically increases kick-in resistance. Do not use drywall screws; they are brittle and fail under shear loads.

Q: Should I add a waste buffer to my screw count?

Yes. Industry practice is **10% for precision work, 15% for rough construction**. On a 10-door job you'd add 10–15 extra screws — small cost that prevents a trip back to the hardware store. Common losses: stripped heads in hardwood, dropped fasteners, pilot-hole drift, and screws that split the wood and must be relocated.

Q: Where should hinges be placed on a door?

Standard placement: **top hinge 7" (18 cm) from the top edge**, **bottom hinge 11" (28 cm) from the bottom**, and **middle hinges evenly spaced between**. Example for a 2.05 m (80.7") door with 3 hinges: at 7″, 40.35″, and 69.7" from the top. This distribution minimizes stress concentration and prevents door sag over time.

Q: How do I fix a hinge whose screw hole is stripped?

Three options in order of severity: (1) **Toothpick-and-glue method** — push wooden toothpicks with wood glue into the hole, let dry 24 h, then re-drive the original screw; (2) **Larger screw** — move up one gauge (#8 → #10) or length (1¼" → 2") to catch fresh wood; (3) **Hinge relocation** — shift the hinge 1" up or down to reach undamaged wood (requires patching and re-mortising the old location).

Enter door height, weight, and count — get the exact number of hinges and screws to buy, including a waste buffer. Uses the industry-standard 1 hinge per 30 inches (75 cm) rule. Free, instant.

🗓️ Updated June 2026 Reviewed by Martín Rodríguez

Calculator Free · Private

Reviewed by: Martín Rodríguez (editorial policy ) · Last reviewed: Jun 22, 2026

Door height (m)*

Door weight / type*

Number of doors*

Holes per hinge leaf*

Waste buffer (%)

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The Door Hinge Calculator uses the industry-standard rule of 1 hinge per 30 inches (≈75 cm) of door height, combined with a weight-based minimum (2 for lightweight hollow-core, 3 for solid-core, 4 for heavy exterior, 5 for steel/security doors). Each hinge has 2 leaves, and each leaf has 2–4 holes — so screws per hinge = holes per leaf × 2 leaves. A typical 80″ (2.05 m) solid-core door needs 3 hinges and 12 screws; with a 10% waste buffer, buy 14 screws. The calculator handles single doors or entire houses in one shot.

When to use this calculator

New construction: calculating total hinges and screws across 12+ interior doors before placing a bulk order — avoids mid-project hardware runs.
Weekend door replacement: confirming exactly how many screws you need (3 hinges × 4 screws = 12) before heading to the hardware store.
Heavy entry door upgrade: accounting for 4–5 hinges on a 180 lb solid-mahogany exterior door, with 3 holes per leaf for load distribution.
Full house renovation: entering 8 doors at once to get a single consolidated shopping list with waste buffer included.

Which hinge SIZE to buy, by door thickness and height (Hager standard)

This calculator tells you how MANY hinges and screws you need. This table tells you which hinge SIZE to put on the shopping list. The rule (Hager Companies template chart) sizes the hinge to the door's thickness and height, then steps up for heavy doors. Hinge size is measured edge-to-edge when the hinge is open (a '3½″ hinge' = 3½″ × 3½″).

Door thickness	Door height	Hinge size	Typical use
⅞″ – 1⅛″ (screen/cabinet)	any	2½″ – 3″	Cabinet, screen, light closet doors
1⅜″	up to 60″	3½″	Lightweight interior, hollow-core
1⅜″	60″ – 90″	4″	Tall interior / light solid-core
1¾″	up to 60″	4½″	Solid-core interior, light exterior
1¾″	60″ – 90″	4½″ – 5″	Standard exterior wood/fiberglass
1¾″ – 2¼″	any (heavy)	5″	Heavy exterior, solid wood
2¼″ and over	any	6″	Oversized / monumental doors

Add hinge WIDTH for thicker doors and heavier trim, not just length. For doors wider than 37″ (940 mm), add one extra hinge regardless of height. Heavy and high-frequency doors should use ball-bearing hinges rather than plain-bearing.

Per-hinge load capacity and recommended screw length

Screws per hinge and the size of the hinge both depend on door weight. Heavier doors need larger hinges (more load per hinge) and longer screws that bite into the framing stud behind the casing, not just the jamb. At least one screw per leaf on an exterior door should reach the stud for kick-in resistance.

Hinge size	Load per hinge (approx.)	Holes per leaf	Recommended screw
3″	~30 lb (14 kg)	2	#8 × 1″ wood screw
3½″	~40 lb (18 kg)	2	#8 × 1¼″ wood screw
4″	~50 lb (23 kg)	2–3	#10 × 1½″ wood screw
4½″	~60 lb (27 kg)	3	#10 × 2″ (1 per leaf to stud)
5″ ball-bearing	~75 lb (34 kg)	3–4	#10 × 2½″ to stud
6″ heavy-duty	~90+ lb (41+ kg)	4	#10 × 3″ structural to stud

Load-per-hinge figures are practical guidance for full-mortise butt hinges; always check the manufacturer's rated capacity, which also drops as door width increases. Never use brittle drywall screws on hinges — they shear under load and cause door sag.

How it works

How Many Hinges Does a Door Need?

The industry rule — referenced by Hager Companies, Royde & Tucker, VK Hardware, and the National Wood Door Association (NWDA) — is 1 hinge per 30 inches (≈75 cm) of door height, with a weight-based minimum as a safety floor.

Quick Reference Table: Hinges by Door Type

Door type	Height	Weight	Hinges needed	Screws (4/hinge)
Hollow-core interior	78″ / 1.98 m	~20 lb / ~9 kg	3	12
Solid-core interior	80″ / 2.03 m	~60 lb / ~27 kg	3	12
Solid exterior (wood/fiberglass)	82″ / 2.08 m	~100 lb / ~45 kg	4	16
Heavy steel / security door	84″ / 2.13 m	>180 lb / >80 kg	5	20–40
Cabinet / closet door	60″ / 1.52 m	~15 lb / ~7 kg	2	8
Extra-tall door	96″ / 2.44 m	any	4+	16+

Weight-Based Minimums

Weight category	Weight range	Minimum hinges
Lightweight	< 15 kg (< 33 lb)	2
Medium	15–40 kg (33–88 lb)	3
Heavy	40–80 kg (88–176 lb)	4
Very heavy (security)	> 80 kg (> 176 lb)	5

Core Formula

Hinges_per_door  = max(weight_minimum, ⌈height_m / 0.75⌉)
Screws_per_hinge = holes_per_leaf × 2
Total_hinges     = hinges_per_door × number_of_doors
Total_screws     = total_hinges × screws_per_hinge
Buy_screws       = ⌈total_screws × (1 + buffer/100)⌉

Screws per Hinge

Each hinge has 2 leaves (one on the door, one on the frame). Screws per hinge depends on the hinge model:

Hinge type	Holes per leaf	Screws per hinge
Standard residential (2½″–3″ butt)	2	4
Heavy-duty / ball-bearing (3½″–4″)	3	6
Commercial / security	4	8

Standard Hinge Placement

Top hinge: 7 inches (≈18 cm) from the top of the door.

Bottom hinge: 11 inches (≈28 cm) from the bottom.

Middle hinge(s): evenly spaced between top and bottom hinges.

Recommended Screw Sizes by Door Type

Door type	Recommended screw
Hollow-core / lightweight	#6 × ⅝" flat-head wood screw
Solid-core interior	#8 × 1¼" flat-head wood screw
Heavy exterior	#8 × 1½" or #10 × 2"
Steel / security door	#10 × 2½" or 3" structural screw to stud

Waste Buffer

Add 10% for precision carpentry and 15% for rough construction to cover stripped screw heads, dropped fasteners, and pilot-hole corrections.

Example: 3 solid-core interior doors, 80″ (2.05 m) tall

Height rule: ⌈2.05 / 0.75⌉ = ⌈2.73⌉ = 3 hinges by height.

Weight: solid-core ≈ 25 kg → medium category → minimum 3 hinges. Result: 3 hinges/door.

Hinge type: standard 2-hole-per-leaf → 2 × 2 leaves = 4 screws/hinge.

Total hinges: 3 doors × 3 = 9 hinges.

Total screws (no buffer): 9 hinges × 4 screws = 36 screws.

With 10% waste buffer: ⌈36 × 1.10⌉ = 40 screws to buy (recommended: #8 × 1¼″ flat-head wood screw).

Buy 9 standard 3″ butt hinges + 40 × #8 × 1¼″ flat-head wood screws. Split across 3 doors: 3 hinges + 14 screws each (rounding for the buffer).

Frequently asked questions

How many hinges does a standard interior door need?

A standard interior solid-core door (about 2.05 m / 80″ tall, 60–80 lb) needs 3 hinges. The rule is 1 hinge per 30 inches (≈75 cm) of height: ⌈80/30⌉ = 3. Lightweight hollow-core doors under 33 lb (15 kg) can use 2 hinges, but most modern building codes and trade guidelines recommend 3 hinges for solid-core doors.

How many screws does a door hinge need?

A standard residential butt hinge has 2 holes per leaf × 2 leaves = 4 screws per hinge. Heavy-duty or ball-bearing hinges (4″ / 100 mm) often have 3 holes per leaf × 2 = 6 screws. Commercial-grade hinges can use 4 holes per leaf × 2 = 8 screws. Always fill every hole — omitting screws concentrates load on fewer points and causes premature wear and door sag.

What size screws should I use for door hinges?

For standard residential interior doors: #8 × 1¼″ flat-head wood screws (coarse thread). For exterior or solid doors: #8 × 2" or #10 × 2½" to reach the structural framing. Security/exterior doors: at least one screw per leaf should be 3" long to reach the stud behind the casing — this dramatically increases kick-in resistance. Do not use drywall screws; they are brittle and fail under shear loads.

How many hinges does a heavy exterior door need?

Exterior solid-wood or steel doors typically weigh 100–200 lb (45–90 kg) and require 4–5 hinges. A 2.10 m (83″) door: height rule gives ⌈83/30⌉ = 3, but the weight-based minimum overrides to 4. For doors over 200 lb (90 kg), use 5 heavy-duty hinges with 3-hole leaves (6 screws each) and 3" structural screws reaching the stud.

Should I add a waste buffer to my screw count?

Yes. Industry practice is 10% for precision work, 15% for rough construction. On a 10-door job you'd add 10–15 extra screws — small cost that prevents a trip back to the hardware store. Common losses: stripped heads in hardwood, dropped fasteners, pilot-hole drift, and screws that split the wood and must be relocated.

Where should hinges be placed on a door?

Standard placement: top hinge 7" (18 cm) from the top edge, bottom hinge 11" (28 cm) from the bottom, and middle hinges evenly spaced between. Example for a 2.05 m (80.7") door with 3 hinges: at 7″, 40.35″, and 69.7" from the top. This distribution minimizes stress concentration and prevents door sag over time.

Can I use the same formula for cabinet or closet doors?

The height/weight formula works for closet doors, but cabinet doors typically use cup hinges (European concealed hinges) rather than butt hinges. Cup hinges mount with a 35 mm Forstner hole and 2–4 screws per hinge. For standard overlay cabinet doors: 2 cup hinges for doors under 60 cm, 3 for doors 60–120 cm. Brands: Blum, Hettich, Salice.

How do I calculate hinges for an extra-wide door?

For extra-wide doors (over 37–48 inches / 94–122 cm wide), add one extra hinge to the standard height-based count. A wide door moves the center of gravity further from the hinge barrel, increasing the bending moment on the top hinge. For doors wider than 48", consult the hinge manufacturer's load table — the rated capacity per hinge changes significantly with door width.

How do I fix a hinge whose screw hole is stripped?

Three options in order of severity: (1) Toothpick-and-glue method — push wooden toothpicks with wood glue into the hole, let dry 24 h, then re-drive the original screw; (2) Larger screw — move up one gauge (#8 → #10) or length (1¼" → 2") to catch fresh wood; (3) Hinge relocation — shift the hinge 1" up or down to reach undamaged wood (requires patching and re-mortising the old location).

Sources & references

Methodology & trust

Editorial

Calculadora de construcción revisada por el equipo editorial de Hacé Cuentas, contrastada con Royde & Tucker — Door size, weight & intended use (hinge selection guide), según nuestra política editorial y metodología.

Updates

Última revisión: June 22, 2026. Los parámetros se verifican periódicamente con las fuentes citadas.

Privacy

Calculations run 100% in your browser. We do not store or transmit your data.

Limitations

Indicative results. For critical decisions, consult a professional.

📌 How to cite this calculator

Rodríguez, M. (2026). Door Hinge Calculator: How Many Hinges and Screws Do You Need?. Hacé Cuentas. https://hacecuentas.com/door-hinge-screw-calculator

Contenido bajo licencia CC-BY 4.0 — reutilizable citando la fuente con enlace a Hacé Cuentas.

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