Calculadora de Telhado

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Estimate roof tiles, rafters and battens from your house dimensions

A single-page roofing materials calculator aimed at masons and DIY builders. You enter the house length and width, the lateral and front and back eaves overhang, the roof pitch in percent, and whether the roof is a two-slope gable or a single-slope lean-to. Choosing a tile type fills in a reference consumption per square metre, and the app continuously recalculates the total number of tiles including a waste allowance, the rafter and batten quantities, the roof area, the ridge height, the rafter length and the number of tile rows per slope. Every input stays editable, and a collapsible panel shows the exact formulas behind each figure.

Highlights

Live results

Updates as you type

Two roof types

Gable or lean-to roof

Math breakdown

Shows the formulas

How to Use

Set the house sizes
Open the page and enter the house length and width in metres, then fill in the lateral and front and back eaves overhangs. Each field has a short helper line explaining which measurement it expects.
Choose roof and tile
Pick the number of slopes (two slopes for a gable roof or a single slope for a lean-to), set the pitch percentage, and select a tile type from the reference list. The choice writes the tiles-per-square-metre figure into a field you can still edit.
Read and reuse results
The result panel recalculates immediately and lists total tiles, rafters, battens, roof area, ridge height and row counts. Expand the formula section to see how each number is derived, then use the save or print buttons to keep or export the estimate.