When it comes to storing water for your home, office, or industrial use, one of the biggest questions people ask is: What size water tank do I need? Choosing the right tank size is not just about storage capacity—it’s about matching your daily water consumption with a practical, long-term solution.
Whether you live in a city with frequent water cuts, a village relying on borewell water, or you are setting up an industrial site, the water tank size chart is your best reference point. It helps you understand how much water different tank capacities can hold, how many people it can serve, and where it is best used.
In this guide, I will walk you through everything you need to know about water tank sizes, right from household usage to commercial requirements, so you can make the right decision.
Why Water Tank Size Matters
Before jumping into the charts and numbers, let’s quickly understand why choosing the correct size is so important:
Avoid Shortages: If your tank is too small, you will run out of water frequently, causing inconvenience.
Save Costs: Buying an oversized tank when you don’t need it means wasted money and space.
Maintain Water Quality: Properly sized tanks ensure water doesn’t sit unused for too long, which reduces the risk of contamination.
Efficiency in Usage: Matching the tank size with your family or business needs ensures a smooth supply of water every day.
Think of it like buying shoes—too small and you’ll be uncomfortable, too big and it won’t fit well. Water tanks work the same way.
Factors to Consider Before Choosing a Water Tank Size
When deciding on the right tank size, don’t just look at capacity alone. Here are a few practical factors to keep in mind:
Number of People Using the Tank
On average, one person requires 135–150 liters of water per day for drinking, cooking, washing, and bathing.
Purpose of Use
Domestic use (household)
Commercial use (restaurants, offices, schools)
Industrial use (factories, construction sites, agriculture)
Water Supply Frequency
Daily supply vs. alternate-day supply.
In areas with irregular water supply, you’ll need a bigger tank for storage.
Available Space
Roof tanks, underground tanks, and vertical vs. horizontal tanks—space plays a huge role in what you can install.
Future Expansion
If your family or business is growing, go for a slightly larger tank to save on replacement costs later.
Standard Water Tank Sizes
Water tanks come in different capacities, usually measured in liters (L) or gallons (gal). The most common tank sizes available in the market are:
200 Liters
500 Liters
750 Liters
1000 Liters (1 KL)
1500 Liters
2000 Liters
3000 Liters
5000 Liters
10,000 Liters and above (mostly for commercial/industrial use)
Water Tank Size Chart for Households
Here’s a quick chart to help you match the tank capacity with the number of family members in your home:
| Family Size | Average Daily Water Use | Recommended Tank Size |
|---|---|---|
| 1 Person | 150 Liters | 200–300 Liters |
| 2 People | 300 Liters | 500 Liters |
| 3 People | 450 Liters | 750 Liters |
| 4 People | 600 Liters | 1000 Liters (1 KL) |
| 5 People | 750 Liters | 1000–1500 Liters |
| 6–7 People | 900–1050 Liters | 1500–2000 Liters |
| 8–10 People | 1200–1500 Liters | 2000–3000 Liters |
👉 Tip: Always choose a slightly bigger tank than the calculated need to avoid shortages during peak usage.
Water Tank Size Chart for Commercial and Industrial Use
For businesses, schools, offices, or industries, the water requirement is higher. Here’s a general guide:
| Establishment Type | Average Daily Use | Recommended Tank Size |
|---|---|---|
| Small Office (10–15 employees) | 1500–2000 Liters | 2000 Liters |
| Medium Office (20–40 employees) | 3000–5000 Liters | 5000 Liters |
| School (100 students) | 15,000 Liters | 15,000 Liters |
| Small Restaurant | 3000–5000 Liters | 5000 Liters |
| Large Restaurant/Hotel | 10,000–25,000 Liters | 25,000 Liters |
| Construction Site | 10,000–50,000 Liters | 20,000–50,000 Liters |
| Factory/Industrial | Depends on machinery + workers | 50,000 Liters+ |
This chart is just a starting point. For specialized industries (like textile, chemical plants, or agriculture), water usage can vary widely.
Water Tank Size Chart PDF
The Water Tank Size Chart PDF provides a clear and practical guide to choosing the right tank capacity for households, offices, and industries. It includes recommended sizes based on family size, daily water usage, and commercial needs. Designed in an easy-to-read landscape format, this chart is a handy reference for planning efficient and reliable water storage.
Types of Water Tanks and Their Sizes
Now that we’ve discussed the size chart, let’s quickly look at different types of tanks available and where they are best used:
1. Plastic (Polyethylene) Tanks
Most common for households.
Sizes: 200 Liters to 10,000 Liters.
Lightweight, affordable, easy to install.
2. Concrete Tanks
Used for underground or large storage needs.
Sizes: 5000 Liters to 50,000 Liters+.
Strong, durable, but costly.
3. Steel/Metal Tanks
Ideal for industries and agricultural use.
Sizes: 1000 Liters to 100,000 Liters+.
Long lifespan but prone to rust if not maintained.
4. Fiberglass Tanks
High strength and corrosion-resistant.
Sizes: 1000 Liters to 50,000 Liters.
Expensive but durable.
How to Calculate the Tank Size You Need
Here’s a simple formula to calculate your ideal water tank size:
Tank Size (Liters) = Number of People × Average Daily Use per Person × Number of Days Storage Needed
👉 Example:
For a family of 5, if each person uses 150 liters per day and you want storage for 2 days:
5 × 150 × 2 = 1500 Liters
So, a 1500–2000 Liter tank would be the right choice.
Common Mistakes People Make When Choosing a Tank Size
Ignoring Peak Usage: People often underestimate water use during festivals, guests staying over, or seasonal needs.
Not Considering Future Growth: If your family is growing, you may outgrow your tank quickly.
Space Mismanagement: Choosing a bigger tank than your space can handle leads to installation issues.
Overestimating Needs: Buying a tank that’s too large may waste money and cause water to stagnate.
Final Thoughts
A water tank is not something you buy every year—it’s a long-term investment in your comfort, health, and daily convenience. The right size ensures you never run short of water and don’t end up paying for excess capacity you don’t use.
By using the water tank size chart, calculating your daily consumption, and considering your future needs, you can make a smart choice that fits both your lifestyle and budget.
So whether you are looking for a 500-liter tank for a small family or a 10,000-liter tank for a business, the right decision today will save you from water worries tomorrow.
Quick Answers on Water Tank Size
1. How do I choose the right water tank size for my home?
Choosing the right water tank size depends on the number of people in your household, their daily water usage, and how frequently water is supplied. On average, one person uses about 150 liters daily. Multiply this by the number of family members and days of backup you want. Always consider future growth and space availability before selecting a tank.
2. What size water tank do I need for a family of four?
For a family of four, daily water consumption is roughly 600 liters (150 liters per person). To ensure a safe backup during water cuts, a tank with 1000–1200 liters capacity is ideal. This allows enough water for drinking, cooking, bathing, and cleaning without constantly refilling the tank. Consider the available space and tank type before making a final decision.
3. Can I use the same tank for drinking and other purposes?
Yes, but it’s important to ensure proper hygiene. If you use one tank for drinking, cooking, and bathing, make sure it is made of food-grade materials and cleaned regularly. Avoid storing water for long periods to prevent bacterial growth. Alternatively, some households prefer two separate tanks: one for potable water and another for washing or gardening, which can increase safety and water quality.
4. How often should I clean my water tank?
Cleaning your water tank every 6–12 months is recommended to maintain water quality. Remove any sediments, algae, or debris, and sanitize the tank with mild chlorine or approved disinfectants. Regular cleaning prevents contamination, ensures safe drinking water, and extends the lifespan of your tank. Always follow the manufacturer’s instructions and, if possible, hire a professional for thorough cleaning.
5. Are underground tanks better than rooftop tanks?
Both types have advantages. Underground tanks save rooftop space and maintain cooler water, reducing algae growth. Rooftop tanks provide water pressure naturally for household taps without a pump. The choice depends on your space, budget, and water supply situation. Many households use a combination of both: an underground tank for storage and a smaller rooftop tank for immediate daily use.
6. How much water does a small office of 15 people need?
A small office with 10–15 employees generally consumes 1500–2000 liters per day for drinking, handwashing, toilets, and cleaning. Choosing a 2000-liter tank ensures a reliable daily supply without frequent refilling. Factors such as air conditioning, kitchens, or small cafeterias may increase demand slightly, so it’s wise to add a 10–15% buffer for peak usage.
7. Does tank material affect water quality?
Yes, tank material plays a crucial role. Plastic (food-grade polyethylene) tanks are lightweight and safe for drinking water, while steel or concrete tanks may require coatings to prevent contamination. Fiberglass tanks resist corrosion and last longer. Always select a material suitable for your water type and ensure proper cleaning and maintenance to preserve water quality and prevent bacterial or chemical contamination.