Water Tank Size Calculator

Calculate the right overhead or underground water tank capacity based on family size and IS 1172 water usage standards. Built for civil engineers, plumbers & home buyers.

Household Details

Enter family size, usage pattern and tank type.

Number of People

Daily Water Usage

Storage Backup (days)

Tank Type

Tank Recommendation

4 people — 540 litres/day — 1 day backup

540 L

Required Capacity (143 gallons)

2.7′ × 3.3′

Cylindrical (Ø × H)

3.7′ × 2.8′ × 1.9′

Rectangular (L × W × H)

Standard Sintex / Plastic Tank Sizes

500 L133 gal

750 L199 gal

1,000 L265 gal

1,500 L397 gal

2,000 L529 gal

3,000 L793 gal

5,000 L1,322 gal

10,000 L2,643 gal

Plan your tank placement on an AI floor plan

DrawMagic generates Vastu-compliant floor plans in seconds — visualise room layouts with plumbing and utility areas before construction starts.

Based on IS 1172 urban residential water supply standards. Actual usage varies by climate, lifestyle and local water supply schedules. Consult your plumber for site-specific requirements.