Calculadora de Muro de Contenção

Última atualização: 2026-06-23

Use a Calculadora de Muro de Contenção para obter resultados precisos. Insira os valores abaixo.
Dados
Resultado
Insira os valores e pressione Calcular
Common Sizes — Click to Fill
Comprimento do muro (m) Comprimento do bloco (cm) Altura do bloco (cm) Altura do muro (m)
Small wall 3 m 20 cm 0.2 cm 0.9 m
Medium wall 4.5 m 20 cm 0.2 cm 0.9 m
Large wall 6 m 20 cm 0.2 cm 0.9 m
Room 9 m 20 cm 0.2 cm 0.9 m
House perimeter 12 m 20 cm 0.2 cm 0.9 m
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O que é o Retaining Wall Calculator?

Retaining walls hold back soil on sloped sites — and building one without enough drainage or structural blocks leads to wall failure and costly repair. This calculator computes the total number of concrete blocks needed for your wall dimensions, plus the volume of drainage gravel to place behind the wall for water management.

You may also find the Concrete Steps Calculator, Drywall Calculator, and Paver Calculator useful.

Quem usa esta calculadora?

This tool is used by homeowners landscaping a sloped yard, landscapers building garden retaining walls, and civil engineers specifying low-height retaining structures.

Como usar the Retaining Wall Calculator

  1. Insira Wall length.
  2. Insira Wall height.
  3. Insira Block length.
  4. Insira Block height.
  5. Clique em Calcular para ver os resultados instantaneamente.

Fórmula

The calculator uses the following formula:

Blocks = ceil(length ÷ block_L) × ceil(height ÷ block_H); Gravel = length × base_depth × 0.6

Exemplo de cálculo

A 6 m long × 0.9 m high retaining wall using 400 mm × 200 mm blocks needs approximately 68 blocks plus 1.08 m³ of drainage gravel behind it.

Cálculo passo a passo

  1. Courses high: ceil(0.9 m ÷ 0.2 m) = 5 courses
  2. Blocks per course: ceil(6 m ÷ 0.4 m) = 15 blocks
  3. Total blocks: 15 × 5 = 75 blocks
  4. Base gravel depth: 20 cm; Volume: 6 × 0.6 × 0.2 = 0.72 m³ ≈ 1.1 tonnes

Erros comuns a evitar

  • Not burying the first course below grade — minimum 10% of wall height
  • Forgetting drainage pipe and gravel backfill behind the wall
  • Using standard blocks instead of approved retaining wall blocks for walls > 90 cm
Pro Tip: Every retaining wall needs drainage — a perforated pipe at the base wrapped in geofabric, backfilled with 200–300 mm of 20 mm aggregate. Without it, water pressure will push the wall over within a few years.

Perguntas frequentes

How high can a retaining wall be without engineering?
Most councils allow retaining walls up to 600–900 mm high without engineering certification. Walls above 1 m typically require a structural engineer's design and council approval. Always check local regulations.

What is the best block type for a retaining wall?
Concrete segmental retaining wall blocks (SRW blocks) are the most common for DIY. They interlock without mortar and are designed for retaining walls. Sizes typically range from 200 × 100 × 200 mm to 450 × 200 × 250 mm.

How much batter (lean) should a retaining wall have?
A batter of 1:10 (10 mm per 100 mm of height) is standard for segmental block walls. This lean-back improves stability by shifting the wall's centre of gravity toward the retained soil.

What type of gravel do I use behind a retaining wall?
Use clean 20 mm crushed rock or gravel (no fines). Fines compact and retain water, defeating the purpose. The drainage layer should be at least 300 mm wide, wrapped in geofabric to prevent soil ingress.

How many courses of blocks per metre of wall height?
This depends on block height. 200 mm blocks give 5 courses per metre, 100 mm blocks give 10 courses per metre. Calculate: height (mm) ÷ block height (mm) = number of courses.

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

calcto.work — Calculated on 2026-06-23