Calculadora de Pedra Decorativa

Última atualização: 2026-06-23

Use a Calculadora de Pedra Decorativa para obter resultados precisos. Insira os valores abaixo.
Dados
Dimensões
Parâmetros técnicos
Resultado
Insira os valores e pressione Calcular
Common Sizes — Click to Fill
Comprimento da área (m) Largura da área (m) Profundidade da pedra (cm) Tipo de rocha
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
Ferramentas relacionadas
Calculadora de Mulch Calculadora de Calçada Calculadora de Grama Calculadora de Concreto Simples

O que é o 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.

Quem usa esta calculadora?

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

Como usar the Landscape Rock Calculator

  1. Insira Area length.
  2. Insira Area width.
  3. Insira Rock depth.
  4. Insira Rock type.
  5. Clique em Calcular para ver os resultados instantaneamente.

Fórmula

The calculator uses the following formula:

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

Exemplo de cálculo

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.

Cálculo passo a passo

  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

Erros comuns a evitar

  • 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).

Perguntas frequentes

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.

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

calcto.work — Calculated on 2026-06-23