Gratis en LíneaCalculadoras
Window Opening Calculator
Calculate rough opening dimensions and header size for windows and doors. Add multiple openings of different sizes.
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Width (in)Height (in)QtyRough Opening
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Características Principales — Window Opening Calculator
Rough opening width and height
Structural header size recommendation
Multiple window support
Total glass area
Standard framing practices
Por Qué Usar Esta Herramienta — Window Opening Calculator
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Privacidad Primero
Todo el procesamiento ocurre en tu navegador. Tus datos nunca salen de tu dispositivo.
Ultra Rápido
Obtén resultados instantáneos sin tiempo de espera. Sin retrasos de servidor.
Funciona en Todos Lados
Usa en cualquier dispositivo — escritorio, tablet o teléfono. Sin descargas necesarias.
Preguntas Frecuentes — Window Opening Calculator
What is a rough opening?
The framed opening before the window is installed. Typically window size + 2" wide and + 2.5" tall for shimming.
How to size a window header?
Span ≤36": doubled 2×4; ≤48": doubled 2×6; ≤60": doubled 2×8; ≤72": doubled 2×10. Consult engineer for load-bearing.
How to measure for replacement windows?
Measure width and height at 3 points each; use the smallest. Add 2" to width and 2.5" to height for rough opening.