Get the concrete for a lamp post base.
⚙️Calculation Parameters
📊Calculated Output
How Lamp Post Base Concrete Calculator Works?
To size a lamp post base, the Lamp Post Base Concrete Calculator finds the cylinder volume and subtracts the conduit sweep and anchor bolts. The process takes 4 steps.
Enter base size
Type the base diameter and depth. Taller poles need wider, deeper bases.
Enter the conduit
Type the conduit outer diameter (OD) and the length that runs through the base.
Enter anchor bolts
Type the bolt count, diameter and embedment, such as 4 bolts of 3/4 in × 18 in.
Read net concrete
The calculator subtracts the voids and shows cubic feet (ft³), cubic yards (yd³) and bags.
Lamp Post Base Concrete Calculator Formula
The Lamp Post Base Concrete Calculator subtracts embeds from a cylinder.
Base
V_b = π × (D ÷ 24)² × (H ÷ 12)Full base volume.
Voids
V_v = π × (OD ÷ 24)² × (L ÷ 12) + n × π × (d ÷ 24)² × (E ÷ 12)Conduit plus bolts.
Net
V = V_b − V_vConcrete to order.
Worked example: 18 in × 48 in base, 2 in conduit (2.375 in OD), 4 bolts 3/4 in × 18 in
- V_b = 7.069 ft³
- V_v = 0.1231 + 0.0184 = 0.1415 ft³
- V = 6.927 ft³ → 12 bags of 80 lb
Lamp Post Base Concrete Calculator Conversion Table
The lamp post base conversion table lists 5 base sizes with a vertical conduit subtracted.
| Pole | Base | Conduit | Net ft³ | Net yd³ | 80 lb bags |
|---|---|---|---|---|---|
| Residential lamp post | 12 in × 36 in | 2.375 in OD | 2.26 | 0.084 | 4 |
| Driveway light | 16 in × 36 in | 2.375 in OD | 4.10 | 0.152 | 7 |
| Parking light 12 ft | 18 in × 48 in | 2.375 in OD | 6.95 | 0.257 | 12 |
| Parking light 20 ft | 24 in × 60 in | 3.5 in OD | 15.37 | 0.569 | 26 |
| Parking light 30 ft | 24 in × 72 in | 3.5 in OD | 18.45 | 0.683 | 31 |
Base sizes are typical values. The pole maker and the electrical design set the required base.
What is Lamp Post Base Concrete Calculator?
A Lamp Post Base Concrete Calculator is a calculator that sizes cylindrical concrete bases for lamp posts and light poles, net of conduit and anchor bolt voids.
Light pole bases hold a pole upright against wind and carry the wiring up through a conduit. Anchor bolts set in the top match the pole base plate. The calculator handles the base volume and the embeds together, and the void list doubles as a pre-pour checklist.
Residential lamp posts use 12 in to 16 in bases. Parking lot poles use 18 in to 24 in bases up to 6 ft (1.8 m) deep.
What are the uses of Lamp Post Base Concrete Calculator?
There are 4 main uses of the Lamp Post Base Concrete Calculator.
Yard lamp posts
Owners pour a base for a driveway or garden light.
Parking lot lights
Contractors size bases for 12 ft to 30 ft poles.
Electrical bids
Electricians price concrete for light pole bases.
Embed checks
Crews confirm conduit and bolts before the pour.
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