Last Updated: September 18, 2026
The Short Answer
The standard 29 gallon aquarium dimensions are approximately 30 1/4 inches long by 12 1/2 inches wide by 18 3/4 inches high. In centimeters, that is about 76.8 cm long by 31.8 cm wide by 47.6 cm high. Exact measurements vary slightly by brand, frame design, and glass thickness, so check the manufacturer’s specifications before buying a stand or planning a tight installation.
A filled 29-gallon tank is a substantial piece of furniture. The water alone weighs about 242 pounds, based on 8.34 pounds per gallon. Add the glass tank, gravel, décor, equipment, and a small amount of water displacement, and the operating weight commonly reaches approximately 275 to 320 pounds. Use a purpose-built aquarium stand or a professionally engineered surface rated for the full load.
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For 2026, typical retail pricing is about $100 to $160 for a bare 29-gallon glass tank and approximately $170 to $230 for a kit with a hood, light, filter, and other accessories. A premium low-iron or extra-clear glass model may cost more.
Standard Sizes
Most 29-gallon aquariums share a similar footprint, but the listed capacity does not guarantee identical outside dimensions. Some manufacturers measure the tank body only, while others include the plastic rim or frame. The table below shows useful real-world sizes for comparing tanks and planning furniture.
| Tank type | Approx. length | Approx. width | Approx. height | Approx. capacity | Approx. filled weight |
|---|---|---|---|---|---|
| Standard 29-gallon rectangular tank | 30 1/4 in (76.8 cm) | 12 1/2 in (31.8 cm) | 18 3/4 in (47.6 cm) | 29 gal (110 L) | 275–320 lb (125–145 kg) |
| Common framed 29-gallon variation | 30 5/8 in (77.8 cm) | 12 3/4 in (32.4 cm) | 18 3/4 in (47.6 cm) | 29 gal (110 L) | 275–320 lb (125–145 kg) |
| 20-gallon long comparison tank | 30 1/4 in (76.8 cm) | 12 1/2 in (31.8 cm) | 12 3/4 in (32.4 cm) | 20 gal (76 L) | 190–230 lb (86–104 kg) |
| 55-gallon rectangular comparison tank | 48 1/4 in (122.6 cm) | 12 3/4 in (32.4 cm) | 21 in (53.3 cm) | 55 gal (208 L) | 500–625 lb (227–283 kg) |
The 29-gallon tank has nearly the same length and width as a 20-gallon long aquarium, but it is about 6 inches taller. That extra height adds water volume and visual presence while preserving a relatively narrow footprint. It is a useful middle size for freshwater fish, planted aquariums, and some carefully planned saltwater setups.
Allow additional clearance beyond the tank’s listed measurements. A practical stand should be at least 31 inches wide and 13 to 14 inches deep, although a slightly larger top is preferable. Leave room behind the aquarium for a filter, airline tubing, heater cord, and power strip. A hood or light may add several inches above the glass rim.
How to Measure Your Space
- Measure the floor area. Record the available width and depth in several places, especially between walls, cabinets, or door trim. Plan for at least a 31-inch-wide by 14-inch-deep stand for many 29-gallon tanks.
- Measure vertical clearance. Add the aquarium height, stand height, hood, and working space. A tank that is 18 3/4 inches high on a 30-inch stand may require roughly 55 to 65 inches of total clearance once lighting and maintenance space are included.
- Check the walking path. Measure doorways, stairways, hallways, and elevator openings before delivery. The empty tank is easier to move than a completed setup, but the stand may be a large, rigid piece.
- Locate wall studs and outlets. Position the stand so it can sit level against a suitable wall when possible. Keep electrical connections above potential splash zones and avoid stretching cords across walkways.
- Confirm the floor can carry the load. A 29-gallon setup can weigh more than 300 pounds. On upper floors, near a wall or load-bearing area is generally preferable, but ask a qualified professional if you have concerns about the structure.
- Account for maintenance access. Leave enough space to remove the lid, reach the filter, siphon water, and lift decorations out of the tank. A gap of about 6 to 12 inches above the tank is often more comfortable than a tight installation.
- Verify the stand dimensions. Do not assume every 29-gallon stand fits every 29-gallon tank. The stand’s top should support the aquarium’s entire framed base without overhang.
By Room or Use Case
Living Room
A 29-gallon aquarium works well as a focal point in a living room without taking the floor space of a wider 55-gallon tank. Place it away from direct sunlight, heating vents, fireplaces, and frequently opened exterior doors. Sunlight can encourage algae and cause temperature swings. A closed cabinet stand is useful for hiding food, water conditioner, nets, and electrical equipment.
Bedroom
The narrow footprint can suit a bedroom, but filters and air pumps may be noticeable at night. Choose quiet equipment and place the aquarium away from the bed if sound is a concern. Avoid putting the tank on a dresser, bookshelf, or lightweight console unless that furniture has been specifically designed and rated for aquarium loads.
Home Office
A 29-gallon tank can provide visual interest in an office while fitting beside a desk or in a corner. Keep the aquarium away from rolling chair traffic and protect cords from snagging. Plan for a nearby water source or use a dedicated bucket for water changes; carrying several gallons across a workspace increases spill risk.
Kitchen or Dining Area
These rooms can offer convenient access to water, but grease, cooking fumes, and temperature changes are drawbacks. Keep the aquarium away from the stove, dishwasher steam, and direct sunlight through a dining-room window. A covered tank also helps prevent food particles and household debris from entering the water.
Freshwater Community Setup
The 29-gallon format provides useful vertical space for live plants and enough length for many small community fish. It can accommodate a filter rated for at least 30 gallons, although a model rated for 40 to 50 gallons may provide additional circulation if the flow is adjustable. A typical adjustable heater is 100 to 150 watts, depending on room temperature and the manufacturer’s guidance.
Planted or Saltwater Setup
For a planted aquarium, choose a light that matches the plants rather than relying only on the tank’s included fixture. For simple marine systems, account for extra equipment, rock, sand, and water movement before buying a stand. Saltwater setups can approach or exceed the upper end of the estimated weight range, so never substitute a lightweight decorative table.
Common Sizing Mistakes
- Measuring only the glass box: Frames, lids, hinges, light brackets, and rear filter compartments can increase the actual footprint.
- Buying a stand by gallon rating alone: A stand labeled for 29 gallons may fit a different brand’s dimensions. Compare the stand’s top measurements with the tank base.
- Forgetting working clearance: A tank may fit under a shelf but leave no room to remove the lid or clean the glass.
- Underestimating weight: Water is only part of the load. Gravel, rocks, wood, equipment, and the tank itself add many pounds.
- Using a narrow top: The aquarium should sit fully supported and level. Do not allow the base to extend beyond the stand.
- Overfilling the tank: The nominal 29-gallon capacity is not always the actual water volume after gravel and décor are installed. Follow the tank’s fill line and avoid water contacting the lid or rim.
- Ignoring equipment space: HOB filters, canister hoses, tubing, and cords need room behind or beside the aquarium.
FAQ
How wide is a 29-gallon aquarium?
Most standard 29-gallon aquariums are about 12 1/2 to 12 3/4 inches wide, or approximately 31.8 to 32.4 centimeters. Confirm the outside width, including the frame, when selecting a stand.
How tall is a 29-gallon fish tank?
A typical tank is approximately 18 3/4 inches tall, or 47.6 centimeters. The stand, hood, and light can raise the top of the finished setup to roughly 50 to 65 inches from the floor.
What size stand is needed for a 29-gallon aquarium?
Choose a purpose-built stand with a top at least as large as the aquarium base—commonly about 31 inches wide and 13 to 14 inches deep. It should be rated for at least 300 pounds, with a higher capacity preferred for heavily decorated or saltwater systems.
How much does a full 29-gallon aquarium weigh?
Twenty-nine gallons of water weigh about 242 pounds. With the glass tank, stand, substrate, décor, and equipment, a complete freshwater setup commonly weighs 275 to 320 pounds. A marine setup may weigh more, so calculate the finished load before installation.
Ready to decide? Our #1 pick for 2026 is the Standard 29-gallon rectangular tank.
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