Hole Volume Calculator
Use this hole volume calculator to estimate the volume of circular or rectangular holes for posts, concrete footings, or small excavation work. You can also add a hole count and waste allowance to estimate the concrete needed for a batch of holes. It is a quick planning tool when you need a material check before you dig or pour.
Result
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What This Hole Volume Calculator Helps You Do
Use this hole volume calculator to estimate the volume of circular or rectangular holes for posts, concrete footings, or small excavation work. You can also add a hole count and waste allowance to estimate the concrete needed for a batch of holes. It is a quick planning tool when you need a material check before you dig or pour.
How to Calculate Hole Volume Calculator
- Choose the hole shape - Decide whether you are measuring a circular hole or a rectangular excavation. Use the matching dimensions for that shape only.
- Enter the dimensions - Add the diameter and depth for circular holes, or the length, width, and depth for rectangular holes.
- Set the hole count - If you are digging several identical holes, enter the quantity so the calculator can estimate the total fill volume.
- Add waste if needed - Use a small waste allowance when the project involves uneven sides, overdigging, or concrete left behind in the bucket or mixer.
Hole Volume Calculator Formula
| Symbol | Definition | Unit |
|---|---|---|
| diameter | Hole diameter for a circular hole | m |
| depth | Hole depth | m |
| length | Hole length for a rectangular hole | m |
| width | Hole width for a rectangular hole | m |
| holeCount | Number of identical holes | holes |
| waste | Allowance for spoil, overdig, and cleanup | % |
Worked Examples
- diameter: 0.3
- depth: 1.0
- length: 0.6
- width: 0.6
- holeCount: 4
- waste: 8
Result: Concrete fill = 0.31 m3
This is a good first-pass estimate for a small fence line. The estimate is 0.31 m3.
- diameter: 0.45
- depth: 1.2
- length: 0.6
- width: 0.6
- holeCount: 6
- waste: 6
Result: Hole volume = 0.19 m3
A deeper circular hole can take more concrete than it looks like at first glance. The estimate is 0.19 m3.
- diameter: 0.35
- depth: 0.8
- length: 2.0
- width: 0.5
- holeCount: 2
- waste: 5
Result: Hole volume = 0.80 m3
Rectangular excavations are easy to estimate once you have the depth. The estimate is 0.80 m3.
- diameter: 0.25
- depth: 1.3
- length: 0.5
- width: 0.5
- holeCount: 12
- waste: 10
Result: Concrete fill = 0.84 m3
A higher waste allowance is sensible when the crew is mixing and placing many holes in one run. The estimate is 0.84 m3.
How to Interpret Your Results
| Range | Meaning | Action |
|---|---|---|
| Under 0.05 m3 | Very small hole | A small bagged mix may be enough for the fill. |
| 0.05 to 0.25 m3 | Small footing or post set | Check bag yield and keep a little extra on hand. |
| 0.25 to 1 m3 | Moderate excavation | Confirm delivery size before you order concrete or base material. |
| Above 1 m3 | Large excavation or multiple holes | Use a larger material order and check the site access plan. |
Frequently Asked Questions
Sources
Last reviewed: March 2026