Calculatrice Gravier Décoratif

Dernière mise à jour: 2026-06-23

Utilisez le Calculatrice Gravier Décoratif pour obtenir des résultats précis. Saisissez vos valeurs ci-dessous.
Données
Dimensions
Paramètres techniques
Résultat
Entrez les valeurs et appuyez sur Calculer
Common Sizes — Click to Fill
Longueur de la zone (m) Largeur de la zone (m) Profondeur du gravier (cm) Type de roche
3 m 2 m 8 cm 1
5 m 3 m 8 cm 1
6 m 4 m 8 cm 1
8 m 5 m 10 cm 1
10 m 8 m 10 cm 2
Outils associés
Calculatrice de Paillis Calculatrice de Pavés Calculatrice de Gazon Calculateur Béton de Masse

Qu'est-ce que le Landscape Rock Calculator?

Landscape rocks and decorative gravel are sold by weight (tonnes) or volume (m³) depending on the supplier. Ordering by eye always leads to either bare patches or a leftover pile. This calculator converts your area dimensions and desired depth into the exact tonnes or cubic metres to order, using the density of the specific rock type you choose.

You may also find the Mulch Calculator, Paver Calculator, and Sod & Turf Calculator useful.

Qui utilise cette calculatrice?

This tool is used by homeowners landscaping garden beds, landscapers quoting rock supply jobs, and garden centres estimating delivery volumes.

Comment utiliser the Landscape Rock Calculator

  1. Saisissez votre Area length.
  2. Saisissez votre Area width.
  3. Saisissez votre Rock depth.
  4. Saisissez votre Rock type.
  5. Cliquez sur Calculer pour voir vos résultats instantanément.

Formule

The calculator uses the following formula:

Area = Length × Width; Volume = area × (depth ÷ 100); Tonnes = volume × rock_density

Exemple de calcul

A 8 m × 3 m garden bed with 80 mm depth of river pebbles (density 1.5 t/m³) requires 1.92 m³ of rock, or approximately 2.9 tonnes to order.

Calcul étape par étape

  1. Area: 6 m × 4 m = 24 m²
  2. Depth in metres: 8 cm ÷ 100 = 0.08 m
  3. Volume: 24 × 0.08 = 1.92 m³
  4. Crushed granite density ≈ 1.6 t/m³: 1.92 × 1.6 = 3.07 tonnes

Erreurs courantes à éviter

  • Underestimating depth — decorative rock needs minimum 5-8 cm to suppress weeds
  • Forgetting to install landscape fabric under the rock
  • Using volume (m³) pricing when ordering by weight (tonnes) — convert correctly
Pro Tip: Always order 10% extra — rocks settle over time and you'll need top-ups. Specify the exact product name and grade when ordering, since density varies significantly between rock types (crushed granite 1.6 t/m³ vs river pebbles 1.45 t/m³).

Questions fréquentes

How deep should landscape rock be?
For weed suppression: 75–100 mm minimum. For decorative effect: 50–75 mm. For pathways: 50 mm. For drainage: 150–200 mm. Deeper layers are more effective at blocking weeds but require significantly more material.

What is the density of common landscape rocks?
Crushed granite: 1.6 t/m³. River pebbles: 1.45–1.5 t/m³. Basalt: 1.6–1.7 t/m³. Decomposed granite (DG): 1.4 t/m³. Limestone: 1.5–1.6 t/m³. Use the correct density for your material to get an accurate weight.

Should I use landscape fabric under decorative rock?
Yes — install woven geofabric before laying rock. It allows water through while blocking weed growth. Avoid plastic sheeting which prevents drainage and kills plant roots. Pin the fabric at edges before covering with rock.

How do I convert between tonnes and cubic metres for rock?
Volume (m³) × density (t/m³) = weight (tonnes). For river pebbles at 1.5 t/m³: 2 m³ × 1.5 = 3 tonnes. Suppliers often quote in one unit — ask for both so you can compare quotes from different suppliers.

How much area does one tonne of landscape rock cover?
One tonne of river pebbles covers approximately 10–12 m² at 50 mm depth, or 5–6 m² at 100 mm depth. For crushed granite, one tonne covers 8–10 m² at 50 mm. Always calculate volume first, then convert to tonnes.

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

calcto.work — Calculated on 2026-06-23