Standard door rough opening = door slab width + 2 in and door slab height + 2.5 in, the typical framing allowance for interior doors. Common interior door sizes: 24/28/30/32/36 in wide x 80 in tall; standard exterior doors: 36 in x 80 in.
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Standard door rough opening = door slab width + 2 in and door slab height + 2.5 in, the typical framing allowance for interior doors. Common interior door sizes: 24/28/30/32/36 in wide x 80 in tall; standard exterior doors: 36 in x 80 in.
About & How It Works
Discover how Door Size Calculator executes your workflow locally in your browser with zero server uploads and total privacy.
Door Size Calculator on Neranjan Tools is an ultra-fast, client-side utility crafted to deliver professional-grade processing without the privacy risks or upload delays of traditional cloud services. Whether handling sensitive business contracts, personal photos, or code snippets, you can accomplish your task in seconds.
Unlike conventional web converters that upload your confidential files to remote third-party servers, this tool operates 100% inside your browser's local sandbox using HTML5 Canvas, WebAssembly, and modern JavaScript engines. Your files are loaded into your device's memory, processed instantly by your local CPU and GPU, and saved directly to your disk, ensuring zero data leaks, zero server logging, and immunity to malware execution.
Step-by-Step Guide
Enter Door Slab Size
Input the door slab width and height in inches (standard interior widths: 24, 28, 30, 32, 36 in at 80 in tall).
Apply Framing Allowance
The calculator adds the standard +2 in width and +2.5 in height framing allowance.
Get Rough Opening
View the rough opening dimensions to frame for.
Zero Server Storage
Files never leave your device. Complete immunity from server breaches or data leaks.
Instant Performance
Immediate processing powered by your local device hardware with zero upload wait times.
All Devices Supported
Works smoothly on iOS, Android, macOS, Windows, and Linux across all modern browsers.
100% Free Forever
No hidden subscriptions, no credit card forms, and unlimited free daily usage.
100% Client-Side Privacy Guarantee
Neranjan Tools guarantees that Door Size Calculator processes your data purely in your browser memory. We never store, log, or inspect your files, protecting you fully against virus uploads and data breaches.
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Common questions and answers regarding this tool.
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