Calculadora de Moldura de Teto

Última atualização: 2026-06-23

Use a Calculadora de Moldura de Teto para obter resultados precisos. Insira os valores abaixo.
Dados
Resultado
Insira os valores e pressione Calcular
Common Sizes — Click to Fill
Comprimento do quarto (m) Largura do quarto (m) Comprimento de cada peça (m)
Small door 2.5 m 2 m 2.4 m
Standard door 3.75 m 3 m 2.4 m
Large door 5 m 4 m 2.4 m
Window 7.5 m 6 m 2.4 m
Bay window 10 m 8 m 2.4 m
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O que é o Crown Molding Calculator?

Crown molding runs along the ceiling perimeter of a room, and ordering the right linear metres is critical — molding is sold in fixed lengths (typically 2.4 m or 3.6 m) and joins are visible if you use short off-cuts. This calculator computes the room perimeter, adds 10% for angled cuts and waste, and tells you how many lengths to buy.

You may also find the Baseboard Calculator, Decking Calculator, and Fence Picket Calculator useful.

Quem usa esta calculadora?

This tool is used by homeowners installing crown molding, finish carpenters quoting trim jobs, and interior designers specifying millwork.

Como usar the Crown Molding Calculator

  1. Insira Room length.
  2. Insira Room width.
  3. Insira Corner type.
  4. Insira Molding piece length.
  5. Clique em Calcular para ver os resultados instantaneamente.

Fórmula

The calculator uses the following formula:

Perimeter = 2 × (length + width); Linear metres needed = perimeter × 1.1; Pieces = ceil(linear_m ÷ molding_length)

Exemplo de cálculo

A 5 m × 4 m room with 90-degree corners requires 18 m of molding perimeter. Adding 10% waste gives 19.8 m — so buy 9 lengths of 2.4 m molding (21.6 m total).

Cálculo passo a passo

  1. Room perimeter: 2 × (5 + 4) = 18 m
  2. Add 10% for mitre cuts and waste: 18 × 1.1 = 19.8 m
  3. Pieces of 2.4 m: ceil(19.8 ÷ 2.4) = 9 pieces

Erros comuns a evitar

  • Not adding extra for mitre cuts — each inside corner wastes ~5 cm per piece
  • Forgetting to measure the height at which crown contacts the wall and ceiling
  • Ordering standard lengths without checking if longer pieces reduce waste
Pro Tip: Use a compound mitre saw for crown molding corners — the dual-angle cuts are difficult to do accurately with a standard mitre box. For large rooms, use longer molding lengths to minimise joins.

Perguntas frequentes

How do I cut crown molding corners?
Crown molding corners require compound mitre cuts — typically 45° mitre and 33.9° bevel for 90-degree inside/outside corners. A dedicated crown molding mitre setting on your saw makes this easier. Test cuts on scrap before cutting good stock.

What is the waste allowance for crown molding?
10% is standard for rooms with 90-degree corners. Add 15–20% if the room has many corners or bay windows, since each corner requires angled cuts that waste material.

Should crown molding be nailed to studs or the top plate?
Crown molding should be nailed at 45 degrees into both the ceiling and wall — hitting studs and ceiling joists where possible. Use a stud finder first. Finish nails (50–65 mm) with a nail gun give the cleanest result.

How do I fill gaps between crown molding and the wall?
Use paintable latex caulk, not silicone. Apply a thin bead along the top and bottom edges, smooth with a damp finger, and paint after it dries. Small gaps (< 3 mm) are expected and easily caulked.

Can crown molding be installed on vaulted ceilings?
Yes, but it requires raking crown molding that runs at the slope of the ceiling, not horizontal. The calculations are more complex. For dramatic vaults, consider cove molding which is more forgiving to install.

Escrito e revisado pela equipe editorial do CalcToWork. Última atualização: 2026-06-23.

calcto.work — Calculated on 2026-06-23