Stone Calculator – Granite, Marble & Stairs Estimator

Expert Guide

Calculate key metrics for heavy natural stones (Granite, Marble, Kota). Combines slab weight, floor cost BOQ, and staircase tread estimation.

Worker laying floor tiles on construction site

⚡ Quick Answer

Granite slabs weigh approximately 2700 kg/m³. An 18mm thick slab (2.4m x 0.75m) weighs about 87 kg. For staircase stone, always add 25mm nosing overhang. For bulk stone sourcing, visit pro.nirmansutra.com.

🛠️ How It Works

Weight Mode: Calculate transport weight from slab dimensions and stone density.
Cost Mode: Converts m² to sq.ft and applies material + labor rates for a complete budget.
Stairs Mode: Calculates both tread (+ nosing overhang) and riser surface areas separately.

📋 Real-Life Example

Example: 10 Granite Steps (0.25m tread, 0.15m riser, 1.0m wide, 25mm nosing).
1. Tread Depth incl. overhang = 0.25 + 0.025 = 0.275m.
2. Tread Area = 10 * (0.275 * 1.0) = 2.75 m² (= 29.6 sq.ft).
3. Riser Area = 10 * (0.15 * 1.0) = 1.5 m² (= 16.1 sq.ft).
4. Total Stone = 45.7 sq.ft.

⚠️ Common Mistakes to Avoid

Ignoring the nosing overhang when ordering stair stone — this can leave you 10-15% short.
Not checking the weight-bearing capacity of kitchen cabinets before ordering thick granite countertops (18mm+).

❓ Frequently Asked Questions

Why are stone rates in sq.ft when area is in m²?

In Nepal and India, stone suppliers use sq.ft for billing. 1 m² = 10.76 sq.ft. See our [Stone Buying Guide](https://blog.nirmansutra.com/) for current market rates.