Quality Inspector
Utility & Plumbing
Water Tank Capacity Calculator (2026) – Litre & Volume Master
Expert Guide
Professional liquid volume calculator for overhead and underground water storage tanks.
⚡ Quick Answer
A standard 2m × 2m × 1.5m rectangular tank holds 6,000 Litres. For a 2m diameter cylinder at 1.5m height, capacity is ~4,712 Litres. For full plumbing designs, visit pro.nirmansutra.com.
🛠️ How It Works
- •Select the tank geometry (Rectangular or Circular).
- •Enter the internal dimensions and the effective water depth (height).
- •The tool calculates the cubic volume (m³).
- •Result is automatically converted to Litres (1 m³ = 1000 Litres).
📐 Calculation Formula
Rectangular Litres = L × W × H × 1000
Circular Litres = 3.1416 × (D/2)² × H × 1000
📋 Real-Life Example
Example: 2m × 2m × 1.5m rectangular tank.
1. Volume = 2 × 2 × 1.5 = 6.0 m³.
2. Litres = 6.0 × 1000 = 6,000 L.
⚠️ Common Mistakes to Avoid
- ✕Measuring external walls — water capacity depends only on clear internal dimensions; subtract 0.23m for brick walls.
- ✕Ignoring the overflow gap — if your tank is 2m tall but the pipe is at 1.8m, enter 1.8m as height for effective storage.
- ✕Mixing units — ensure all measurements are in meters for accurate m³ conversion.
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❓ Frequently Asked Questions
1 cubic meter (1m³) of water equals exactly 1,000 litres. This is the global and trade standard in Nepal for tank sizing.
For a family of 5, an average daily demand is 675–750 litres. An underground tank of 6,000–8,000 litres is recommended to ensure 10 days of storage.
Rectangular tanks (RCC) are space-efficient for underground storage, while circular tanks (HDPE/Plastic) are cost-effective for overhead placement.
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Worth NRs. 5,000
NRs. 999 🎯
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