DIY

Retaining Wall Calculator

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate retaining wall blocks and materials by length and height. Free retaining wall calculator.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

How to Use This Calculator
Getting Accurate Results

Dimensionamento

Blocos/fileira = comprimento ÷ largura do bloco. Fileiras = altura ÷ altura do bloco. Acima de 1 m: engenheiro obrigatório. Drenagem atrás (brita + tubo) é OBRIGATÓRIA — sem drenagem = desabamento. No Brasil, chuvas tropicais de verão tornam drenagem ainda mais crítica.

Materiais

Blocos de concreto: R$3-8/unidade. Gabião (pedra em gaiola de aço): R$150-300/m³ — excelente drenagem natural.

⚡ CalcWolf Insight

Allan Block, Versa-Lok, and Pavestone are the three most common retaining wall block brands. They are NOT interchangeable — each has a proprietary interlocking system. Choose one brand and stick with it for the entire wall. Mixing brands causes misalignment that worsens over time.

Frequently asked questions

Quantos blocos para 6m × 80cm?▾

Blocos 40×20: 15/fileira × 4 = 60 + 10% = 66.

Precisa de engenheiro?▾

Acima de 1 m: obrigatório. Forças de empuxo são sérias.

✓ Math logic verified against primary sources → See our verification process

Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →