🐠 Aquarium Reference

Aquarium Weight Chart

Average empty and full weights for glass and acrylic aquariums from 10 to 300 gallons. Use this to plan your stand, floor placement, and whether you need structural support.

⚠️ These are average weights based on standard tank dimensions. Actual weights vary by manufacturer, glass thickness, and bracing. Weights shown are for the tank only — add substrate, rocks, decorations, sump, stand, and canopy for total floor load. Water weighs approximately 8.34 lbs per gallon.

🔵 Glass Tanks Heavier empty but widely available and less expensive. Standard glass tanks use annealed or tempered glass. Larger tanks use thicker glass which adds significant weight. Most common choice for tanks under 150 gallons.

🟢 Acrylic Tanks Significantly lighter empty — up to 50% less than glass at larger sizes. Stronger than glass at equal thickness, allows for larger seamless builds. Scratches more easily but can be polished. Preferred for very large displays and custom shapes.

🔵 Glass Aquarium Weights

Standard all-glass aquarium weights. Full weight includes water only — add substrate and decor for total load.

Size	Dimensions (L × W × H)	Empty Weight	Full Weight (water only)	Total with Substrate est.
— Small Tanks —
10 Gallon	20″ × 10″ × 12″	11 lbs	94 lbs	~110 lbs
15 Gallon	24″ × 12″ × 12″	21 lbs	146 lbs	~170 lbs
20 Gallon (High)	24″ × 12″ × 16″	25 lbs	192 lbs	~220 lbs
20 Gallon (Long)	30″ × 12″ × 12″	25 lbs	192 lbs	~220 lbs
29 Gallon	30″ × 12″ × 18″	40 lbs	282 lbs	~320 lbs
— Medium Tanks —
30 Gallon	36″ × 12″ × 16″	44 lbs	294 lbs	~340 lbs
37 Gallon	30″ × 12″ × 22″	45 lbs	355 lbs	~405 lbs
40 Gallon (Breeder)	36″ × 18″ × 16″	58 lbs	392 lbs	~460 lbs
55 Gallon	48″ × 13″ × 20″	78 lbs	536 lbs	~625 lbs
65 Gallon	36″ × 18″ × 24″	98 lbs	630 lbs	~740 lbs
75 Gallon	48″ × 18″ × 20″	140 lbs	765 lbs	~900 lbs
— Large Tanks —
90 Gallon	48″ × 18″ × 24″	160 lbs	911 lbs	~1,075 lbs
100 Gallon	72″ × 18″ × 19″	182 lbs	1,016 lbs	~1,200 lbs
120 Gallon	48″ × 24″ × 24″	215 lbs	1,216 lbs	~1,440 lbs
125 Gallon	72″ × 18″ × 22″	206 lbs	1,248 lbs	~1,470 lbs
150 Gallon	72″ × 18″ × 27″	338 lbs	1,588 lbs	~1,850 lbs
180 Gallon	72″ × 24″ × 25″	338 lbs	1,840 lbs	~2,150 lbs
— Extra Large Tanks —
200 Gallon	72″ × 24″ × 27″	400 lbs	2,068 lbs	~2,400 lbs
240 Gallon	96″ × 24″ × 24″	480 lbs	2,482 lbs	~2,880 lbs
265 Gallon	84″ × 24″ × 31″	530 lbs	2,740 lbs	~3,180 lbs
300 Gallon	96″ × 24″ × 30″	600 lbs	3,102 lbs	~3,600 lbs

🟢 Acrylic Aquarium Weights

Acrylic tanks are substantially lighter empty than glass. The weight difference becomes dramatic at larger sizes.

Size	Dimensions (L × W × H)	Empty Weight	Full Weight (water only)	Weight Saved vs Glass
— Small Tanks —
10 Gallon	20″ × 10″ × 12″	8 lbs	91 lbs	~3 lbs
15 Gallon	24″ × 12″ × 12″	14 lbs	139 lbs	~7 lbs
20 Gallon	24″ × 12″ × 16″	18 lbs	185 lbs	~7 lbs
29 Gallon	30″ × 12″ × 18″	28 lbs	270 lbs	~12 lbs
— Medium Tanks —
30 Gallon	36″ × 12″ × 16″	28 lbs	278 lbs	~16 lbs
40 Gallon	36″ × 18″ × 16″	36 lbs	370 lbs	~22 lbs
55 Gallon	48″ × 13″ × 20″	48 lbs	506 lbs	~30 lbs
75 Gallon	48″ × 18″ × 20″	80 lbs	705 lbs	~60 lbs
— Large Tanks —
90 Gallon	48″ × 18″ × 24″	90 lbs	841 lbs	~70 lbs
100 Gallon	72″ × 18″ × 19″	100 lbs	934 lbs	~82 lbs
120 Gallon	48″ × 24″ × 24″	120 lbs	1,121 lbs	~95 lbs
150 Gallon	72″ × 18″ × 27″	160 lbs	1,411 lbs	~178 lbs
180 Gallon	72″ × 24″ × 25″	175 lbs	1,677 lbs	~163 lbs
— Extra Large Tanks —
200 Gallon	72″ × 24″ × 27″	200 lbs	1,868 lbs	~200 lbs
240 Gallon	96″ × 24″ × 24″	240 lbs	2,242 lbs	~240 lbs
265 Gallon	84″ × 24″ × 31″	265 lbs	2,475 lbs	~265 lbs
300 Gallon	96″ × 24″ × 30″	300 lbs	2,802 lbs	~300 lbs

🏠 Floor Load & Placement Guide

A full aquarium is one of the heaviest things in a home. Here's what you need to know before placing a large tank.

🏡 Standard Home Floors

Most residential floors are rated for 40–50 lbs per square foot live load. A 75 gallon tank on a 48″ × 18″ stand covers 6 sq ft — about 150 lbs/sq ft when full. Always place large tanks against a load-bearing wall or consult a contractor for 90+ gallon setups.

📐 Distribute the Weight

A proper aquarium stand spreads weight across a larger floor area. Never place a tank directly on a single piece of furniture or unsupported flooring. Stands should be level — even slight unevenness stresses glass seams over time.

🪵 Wood vs Concrete Floors

Concrete slab floors (basements, ground level) can typically handle any home aquarium. Wood-framed floors need evaluation for tanks over 150 gallons. Position the stand so it runs perpendicular to floor joists when possible.

🔢 What to Add for Real Total Weight

Tank + water is just the start. Add: substrate (gravel ~11 lbs/gallon, sand ~13 lbs/gallon), live rock (~10 lbs per piece), sump (~50–150 lbs full), stand (~100–300 lbs), canopy (~30–80 lbs). A 180 gallon reef setup can easily exceed 3,500 lbs total.

🚨 200+ Gallon Warning

Tanks 200 gallons and above should always have a structural assessment before placement in a wood-framed home. Total system weight can exceed 4,000 lbs. This is not a typical residential floor load — professional evaluation is strongly recommended.

💧 Water Weight Quick Reference

Fresh water: 8.34 lbs per gallon
Salt water: 8.56 lbs per gallon
A 100 gallon saltwater tank holds roughly 856 lbs of water alone before accounting for anything else.

📋 Note: Weights shown are averages based on standard manufacturer dimensions and typical glass/acrylic thicknesses. Actual weights vary between brands and custom builds. Always verify with your specific manufacturer before finalizing stand and floor plans for large setups.