B6 · Specifications
Door Size Standards: Inches, Millimetres and Opening Measurements
Convert door sizes from inches to mm, distinguish leaf, frame and rough opening measurements, and send a quote-ready schedule for bulk project doors.
Direct Answer
30 × 80 inches converts exactly to 762 × 2032 mm. If those are door-leaf dimensions, they are not the required wall opening. Specify the leaf, frame outside dimensions, rough opening and finished wall thickness separately; confirm fitting allowances from the approved door-set drawing.
Use 1 inch = 25.4 mm for conversion. A unit conversion does not establish a local building requirement, accessible clear opening or product approval.
Published by VisFurn
VISFURN is the project-door brand of Tianjin Visfurn Furniture Co., Ltd. This guide supports buyers comparing door packages, specifications and quotation scope.
Door-leaf size conversion: inches to millimetres
These are arithmetic examples, not universal country standards or an approved opening schedule. Keep the supplier’s stated nominal size and the actual measured dimensions in separate fields.
| Leaf width × height in inches | Converted width × height in mm | What this does not specify |
|---|---|---|
| 24 × 80 | 609.6 × 2032 | Frame outside dimensions or rough opening |
| 28 × 80 | 711.2 × 2032 | Frame outside dimensions or rough opening |
| 30 × 80 | 762 × 2032 | Frame outside dimensions or rough opening |
| 32 × 80 | 812.8 × 2032 | Frame outside dimensions or rough opening |
| 36 × 80 | 914.4 × 2032 | Accessible clear opening or any project approval |
On a narrow screen, swipe within the table to compare the columns. Do not round the conversion into a different production size without approval.
Why does a 30 × 80 door not fit a 762 × 2032 wall opening?
The leaf is the moving panel. A complete frame takes additional space, and fitting clearances depend on the selected door set and site conditions. If a buyer measures wall to wall, label that measurement as an opening measurement—not as an approved door-leaf size.
Do not subtract a generic allowance from every opening. Share the measurements and frame detail for review, then approve the resulting leaf and frame dimensions. For a replacement project, record the retained frame and existing leaf separately.
See rough opening versus door-leaf dimensions for the measurement references.
Five measurement references to send with a door RFQ
| Reference | What to record | Why it matters |
|---|---|---|
| Door leaf | Width, height and thickness; existing or proposed | Identifies the panel rather than the opening |
| Frame outside size | Width and height of the proposed or retained frame | Checks the door set against the available opening |
| Rough or existing opening | Width and height, measurement points and drawing/photo reference | Prevents wall-to-wall measurements being quoted as leaf dimensions |
| Finished wall thickness | Wall build-up including the relevant finished surfaces | Coordinates jamb depth and trim |
| Floor and bottom detail | Finished floor level, threshold and required bottom detail | Coordinates the lower frame and leaf interface |
Also state the units, opening ID, quantity, handing and whether each value is measured, proposed or still awaiting site confirmation. Record unusual openings separately rather than forcing them into a standard size.
Separate leaf-only and complete-set quotation scope
Dimensions alone do not define a complete door package. State whether you need the leaf only or the leaf with frame, jamb and architrave. Separate hardware supplied from hardware preparation, and provide the lock, hinge or closer drawings where applicable.
Include finish, room exposure, project-specific documentation requirements and the destination. If goods are to be delivered to a consolidation warehouse before export, distinguish that receiving address from the final destination; do not assume freight, unloading or installation is included.
Use the door-package quote comparison guide to compare the same scope.
How to order a mixed-size door package
Keep one schedule line for each opening type and flag exceptions by opening ID. List dimensions, units, quantity, handing, frame depth, finish, hardware set and delivery phase. Mixed dimensions do not need a universal size-count limit; packing and loading must follow the confirmed configuration and quantities.
If a dimension changes after quotation, issue a dated revision identifying the affected openings. Do not treat a preliminary measurement as a production release.
Review the door schedule quotation checklist and jamb depth and wall-thickness guide before uploading the schedule.
Worked example: from an inch-based schedule to an RFQ
Suppose a project schedule lists a 30 × 80 in proposed leaf for opening A-101. The exact conversion is 762 × 2032 mm. That number is useful for comparing units, but it is not an approved manufacturing dimension. Keep three separate records before requesting a door-set quote:
| Record | A-101 entry | Owner or next check |
|---|---|---|
| Design reference | Proposed leaf 30 × 80 in; equivalent 762 × 2032 mm | Buyer confirms whether this refers to the leaf, not the opening |
| Site survey | Actual opening width and height, finished wall thickness and floor level: to be measured | Site team records measurements and drawing revision |
| Door-set approval | Final leaf, frame outside size, jamb depth and hardware preparation: pending | Buyer and supplier review the selected set against the surveyed opening |
For repeated A-101 openings, add the quantity and identify any exceptions rather than copying one survey measurement across the entire building. If the original schedule is in inches, send it with the metric conversion and state which version controls after approval.
What changes between country and project requirements?
Unit conventions do not establish the applicable local code, fire-door approval, acoustic target or accessible clear opening. Ask the project’s responsible designer or reviewer for those requirements and provide the corresponding specifications with the schedule.
Confirm custom dimensions, configuration and quantity before pricing. This guide does not promise a universal MOQ, stock size, manufacturing tolerance, lead time or fixed rough-opening allowance.
For the conversion itself, the US National Institute of Standards and Technology defines one inch as exactly 25.4 mm. For a US accessible route, the 2010 ADA Standards address clear opening rather than treating nominal leaf width as proof of compliance. The responsible project team must assess the applicable requirements and installed configuration.
FAQ
Door measurement questions
What is a 30 × 80 inch door size in millimetres?
It converts exactly to 762 × 2032 mm. If that describes the leaf, confirm frame outside dimensions, rough opening and fitting clearances separately.
Should I send the old door size or wall-opening size?
Send both when available and label each measurement. For a replacement, also identify whether the existing frame is retained or replaced, with wall thickness and floor details.
Can I use one rough-opening allowance for every door?
No. Confirm allowances against the selected frame, door set and approved installation drawing. Do not reduce wall-to-wall measurements using a generic rule.
Can a bulk door order contain different sizes?
Provide a separate schedule line for each opening type, with dimensions, units, quantity, handing, frame scope and delivery phase. Ask for review of the proposed configuration rather than assuming a fixed limit.
Does a leaf width prove accessibility or fire compliance?
No. Clear opening and any fire or other performance requirement depend on the specified configuration and applicable project approval, not on a leaf dimension alone.
Choose the correct product route after size conversion
Use the Interior Doors page to compare leaf, frame and jamb scope. For room-by-room hospitality schedules, review the hotel guestroom door and its hardware-preparation options. If you already have opening IDs and quantities, send the door schedule for review.