1. What is this Calculator?

This calculator determines the total weight of a 90-gallon fish tank when filled with water, including the weight of the empty tank itself. This is important for structural considerations and placement.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• 90 — Tank volume in gallons
• 8.34 — Weight of water per gallon (lb)
• \( tank\_weight \) — Weight of empty tank (lb)

Explanation: Water weighs approximately 8.34 pounds per gallon. The total weight is the sum of the water weight and the tank's empty weight.

3. Importance of Tank Weight Calculation

Details: Knowing the total weight is crucial for ensuring your floor can support the tank, choosing an appropriate stand, and determining safe placement locations.

4. Using the Calculator

Tips: Enter the empty weight of your 90-gallon tank in pounds. The weight must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is water weight calculated separately?
A: Water weight is constant for a given volume (8.34 lb/gallon), while tank weight varies by material and construction.

Q2: What's the typical weight of a 90-gallon tank?
A: Empty tank weights vary, but a standard glass 90-gallon tank typically weighs 150-200 lb when empty.

Q3: Does this include substrate and decorations?
A: No, this calculates only water and tank weight. Add 10-20% for substrate and decorations.

Q4: How does tank material affect weight?
A: Acrylic tanks weigh less than glass, but the water weight remains the same.

Q5: What's the total weight range for a 90-gallon setup?
A: Typically 900-1000 lb when filled, including tank, water, and standard decorations.