Door Weight Calculator

1. Choose your unit system and enter width, height, and thickness.
2. Select a material preset, or choose custom density.
3. Select the core type to match solid or hollow construction.
4. Add hardware weight for handles, locks, and closer arms.
5. Enable glass insert if there is a cutout or panel.
6. Set hinge count and a safety factor, then calculate.
7. Compare per-hinge design load with hinge specifications.

1) Start with accurate measurements

Measure width, height, and thickness on the slab, not the frame opening. A typical interior door is 800×2000 mm (1.60 m²), while many exterior doors are 900×2100 mm (1.89 m²). Small thickness changes matter because volume scales with thickness.

2) Density is the biggest driver

Mass depends strongly on density. Typical averages are MDF 750 kg/m³, pine 500 kg/m³, oak 720 kg/m³, plywood 600 kg/m³, PVC 1400 kg/m³, fiberglass 1850 kg/m³, aluminum 2700 kg/m³, glass 2500 kg/m³, and steel 7850 kg/m³. Use a datasheet value when possible for accuracy.

3) Use a realistic core factor

Many doors are not fully solid. The core factor scales effective volume to reflect internal voids or low‑density fill. Solid doors use 1.00, semi‑solid reinforcement often fits 0.85, hollow core is commonly near 0.55, foam cores can be around 0.45, and honeycomb cores may be near 0.35.

4) Convert volume into base mass

The calculator computes geometric volume V = W×H×T, then multiplies by the core factor and density: m = V×f×ρ. For a 900×2100×35 mm slab, V = 0.9×2.1×0.035 = 0.06615 m³. With MDF at 750 kg/m³ and f = 1.00, base mass is about 49.6 kg.

5) Add hardware for a closer estimate

Hardware can be a percentage for lighter doors. Many handle and lock sets add 0.5–2.0 kg per leaf. Multipoint locks, panic bars, or door closers can add more. Enter hardware mass so hinge loads reflect the moving assembly, not just the bare slab.

6) Glass inserts change mass two ways

A cutout removes door material but the glass adds weight back. Example: insert area 0.30×1.50 m = 0.45 m². With 6 mm glass, volume is 0.45×0.006 = 0.0027 m³, giving about 6.8 kg at 2500 kg/m³. The removed slab mass depends on thickness and core factor.

7) Translate mass into hinge design load

Weight equals mass times gravity (W = m×g), and per‑hinge design load is estimated as (m×SF)/n. Using 50.6 kg, SF 1.30, and 3 hinges: 50.6×1.30/3 ≈ 21.9 kgf per hinge. Compare this value with hinge ratings on your datasheet.

8) Use results to guide practical decisions

If the per‑hinge load is close to the rated capacity, increase hinge count, use heavy‑duty hinges, or reduce mass with a different core. Taller doors also increase leverage and sag risk, so extra hinges can help alignment. Always follow manufacturer limits for fire‑rated assemblies and operators.

It’s a planning estimate using average density and a core factor. Real doors vary with stiles, rails, skins, and reinforcement. Use custom density and a realistic core factor for better accuracy.

Use 1.00 for solid, about 0.85 for semi‑solid, around 0.55 for hollow, roughly 0.45 for foam, and near 0.35 for honeycomb. Adjust if you have construction details.

No. This tool estimates the door leaf and attached hardware. Frames matter for anchoring and structural checks, but hinge loading is driven mainly by the moving leaf and its hardware.

Hinge ratings often use “kg” or “lb” as force-style limits, while engineering specs use Newtons. Showing both reduces conversion errors when comparing different datasheets.

The calculator subtracts the removed door material and adds the glass mass. If the cutout is large, weight can drop for wood doors, but can rise if thick glass is used.

Heavier, taller, or high‑cycle doors generally need more hinges. Use the per‑hinge design load with a safety factor and choose hinges whose ratings comfortably exceed that load.

Yes. Weigh one known door, then adjust custom density or the core factor until the calculated mass matches. Apply the same settings to similar doors for consistent estimates.