SEPTIC TANK SHAPE,
SIZE & DIMENSIONS
A septic tank is a device that treats wastewater from
water closets. In other words, it is a waterproof singlestorey, underground
tank in which the sewage is stored for a sufficiently long period of time,
allowing for the practical digestion of sediment and settled sediments
suspended by anaerobic bacterial activity.
Also use: WaterSump
Tank Calculator  Tank Volume Calculator  Sump Volume Calculator
SHAPE OF SEPTIC TANK
The simplest form of septic tank is a single box,
rectangular or cylindrical shape. The shape of the septic tank affects the flow
velocity of the wastewater and sludge accumulation.
The dimension of the septic tank should not be too deep.
This is because it may cause a short circuit of the inlet and outlet flows.
The septic tank has a large surface area and sufficient
depth should always be desired.
The rectangular single box tank (three times its width
and length) is the most favourable.
In some cases, a cylindrical shape with the appropriate
size may also be the best choice.
SIZE
OF SEPTIC TANK 
DIMENSIONS 
WEIGHT
(kg) 
ANCHOR
WEIGHT (kg) 
SOIL
COVER (IN) 
5000 gal 18928 liter 
17’ L x 8’ W x7.75’ H 
41400 
30850 
24 
3000 gal  11356 liter 
13.75’ L x 7. 67‘W x 6.41’H 
20300 
23320 
23 
2600 gal  9842 liter 
12.25’L x 7.5’W x 6.08’H 
18100 
20625 
24 
2000 gal – 7570 liter 
13.5’L x 6.5’W x 5.33’H 
16100 
15675 
19 
1600 gal – 6056 liter 
12.08’L x 6.5’W x 5.08’H 
14000 
11270 
16 
1200 gal – 4542 liter 
9.25’L x 6.5’W x 5.08’H 
11400 
9532 
17 
1000 gal – 3785 liter 




Low Profile 
10’L x 67’W x 57’H 
9500 
8705 
17 
1000 gal – 3785 liter 




Heavy Duty 
8’L x x 6.5’W x 5.08’H 
9200 
8945 
18 
800 gal – 3028 liter 
8’L x 67’W x 57’H 
8000 
6560 
16 
600 gal – 2271.25 liter 
6.5’L x 56’W x 60’H 
6600 
3810 
14 
1600/1400 gal  6056/5299 liter 
14.5’L x 90’W x 73’H 
23000 
22410 
22 
1250/750 gal – 4730/2839 liter 
13.5’L x 6.5’W x 5.33’H 
16400 
15725 
19 
1000/600 gal – 3785/2271 liter 
12.08’L x x 6.5’W x 5.08’H 
14700 
12705 
17 
How To Calculate The Size And Capacity
Of The Septic Tank In Gallons?
How do we calculate the gallon volume a septic tank can
deliver based on the simple measurements we can make?
Generally, the residential septic tank is typically 4.5 feet
wide x 8.0 feet long x 6 feet high. Your septic tank may be a different size. The best practice is to find and measure the septic tank to make correct calculations.
Tanks are generally buried 4 inches to 4 feet deep,
depending on local site conditions, shape, slope, and other factors.
Here is the basic math for calculating the capacity
(volume) of the septic tank in gallons. Measurements taken on the internal
dimensions of the septic tank are in feet.
HOW
TO CALCULATE THE SEPTIC TANK CAPACITY IN GALLONS 

Septic Tank In Rectangular 
Length x Width x Depth in feet x 7.5 = gallons 
Septic Tanks In Round 
3.14 x radius squared x depth (all in feet) = cubic
capacity. Cubic capacity x 7.5 = gallons capacity. 
Septic Tank In Rectangular 
Length x Width x Depth in feet / .1337 = gallons 
Septic Tanks In Round 
Length x width in inches / 231 = gallons per inch of
septic tank depth. Multiply this number by septic tank depth in inches to
get gallons 
Notes To The Table Above:
These simple constants and the formula for sizing a
rectangular or round tank can help convert the size of a septic tank into cubic
feet of sewage:
· One
gallon = 231 cubic inches
· One
gallon = 0.1337 cubic feet.
· 1
cubic foot = 7.48 gallons
· Volume
of a cylinder = Pi x radius^{2} x depth
Where,
Radius = half the diameter
Pi = 3.1416
· Volume
of a rectangle = Length x Width x Depth
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