Calculatrice Mur de Soutènement

Dernière mise à jour: 2026-06-23

Utilisez le Calculatrice Mur de Soutènement pour obtenir des résultats précis. Saisissez vos valeurs ci-dessous.
Données
Résultat
Entrez les valeurs et appuyez sur Calculer
Common Sizes — Click to Fill
Longueur du mur (m) Longueur du bloc (cm) Hauteur du bloc (cm) Hauteur du mur (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
Outils associés
Calculatrice Escaliers Béton Calculatrice Placo Calculatrice de Pavés Calculateur Briques Creuses

Qu'est-ce que le 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.

Qui utilise cette calculatrice?

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

Comment utiliser the Retaining Wall Calculator

  1. Saisissez votre Wall length.
  2. Saisissez votre Wall height.
  3. Saisissez votre Block length.
  4. Saisissez votre Block height.
  5. Cliquez sur Calculer pour voir vos résultats instantanément.

Formule

The calculator uses the following formula:

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

Exemple de calcul

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.

Calcul étape par étape

  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

Erreurs courantes à éviter

  • 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.

Questions fréquentes

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.

Écrit et révisé par l'équipe éditoriale de CalcToWork. Dernière mise à jour : 2026-06-23.

calcto.work — Calculated on 2026-06-23