Contents

- 1 How do I figure out how much concrete I need for footings?
- 2 How do you calculate footings?
- 3 How do you calculate cubic meters for footings?
- 4 What concrete do I need for footings?
- 5 How many bags of concrete do I need for a 10×20 slab?
- 6 How many bags of concrete do I need for a 4×4 post?
- 7 What is the standard footing size?
- 8 How thick do footings need to be?
- 9 How deep should my footings be?
- 10 How many bags of cement do I need for 1 cubic meter?
- 11 How many cubic meters is a 25kg bag of concrete?
- 12 How many bags of cement make 1m3 of concrete?
- 13 How long do concrete footings take to dry?
- 14 Does a concrete slab need footings?
- 15 Can I use fast setting concrete for footings?

## How do I figure out how much concrete I need for footings?

**CONCRETE CALCULATOR FORMULA**

**Determine**how thick you**want**the**concrete**.**Measure**the length and width that you’d like to cover.- Multiply the length by the width to
**determine**square footage. - Convert the thickness from inches to feet.
- Multiply the thickness in feet by the square footage to
**determine**cubic feet.

## How do you calculate footings?

**How to Calculate Footing** Size

**Determine**the width and length of the cement slab in inches.- Divide the width by 12 to convert it to feet.
- Divide the length by 12 to convert it to feet.
**Determine**the depth or thickness that is required for the**footing**in inches.- Multiply the width by the length and then by the depth.

## How do you calculate cubic meters for footings?

Multiply the width, length and depth of your area. Concrete is usually ordered in **cubic metres**. Here’s a conversion guide. There are 1.3 **cubic** yards in one **cubic metre** (If you have your requirement in **cubic** yards, all you need to do is divide by 1.3 to get the **cubic metres** answer).

## What concrete do I need for footings?

A **concrete** mix of 1 part **cement**: 2 parts sand: 4 parts coarse aggregate (by volume) **should** be used for **footings**. **Concrete** must be placed within half an hour of mixing. Brickwork – Place your **concrete** into your trench. Work the **concrete** into awkward places and corners using a shovel.

## How many bags of concrete do I need for a 10×20 slab?

A 60-pound **bag** yields. 017 cubic yards, and an 80-pound **bag** yields. 022 cubic yards. For a 10 x 10 **slab**, you **would need** 77 60-pound **bags** or 60 80-pound **bags**.

## How many bags of concrete do I need for a 4×4 post?

Mix two 50lb bags of concrete with water in a mixing tub or 5-gallon bucket. Add concrete into the hole and around the 4” x 4”. Depending on your climate, let concrete set up for **24 – 48** hours.

## What is the standard footing size?

Under every house is a foundation, and under most foundations are **footings**. Most of the time we take **footings** for granted, and usually we can: For typical soils, a common 16- or 20-inch-wide **footing** can more than handle the relatively light weight of an ordinary house.

## How thick do footings need to be?

Depth of **Footings**

**Footings should** extend to a minimum depth of 12 inches below previously undisturbed soil. **Footings** also must extend at least 12 inches below the frost line (the depth to which the ground freezes in winter) or must be frost-protected.

## How deep should my footings be?

**Footings** need to be minimum 1m **deep** by 600mm **wide**. We always trench fill with concrete. Final decision will be with building control, hope you dont have any large trees near.

## How many bags of cement do I need for 1 cubic meter?

Batching by volume – DIY

Materials | 0.2 m^{3} concrete |
1 m^{3} concrete |
---|---|---|

cement (no. 25 kg bags) |
2.5 | 12 |

all-in aggregate (volume in m^{3}) |
0.25 | 1.3 |

water (volume in litres) | 32 | 160 |

cement (no. 25 kg bags) |
3.5 | 14 |

## How many cubic meters is a 25kg bag of concrete?

**Concrete** is a mix, typically of 1 part **cement** to 4-5 aggregate, and a **cubic metre** of finished **concrete** weighs around 2.5 tonnes, so requires around 500kg **cement** or 20× **25kg bags**. In direct answer, there is about 1/100th or 0.01 **m3** in a **25kg bag**.

## How many bags of cement make 1m3 of concrete?

Thus, the quantity of **cement** required for 1 cubic meter of **concrete** = 0.98/0.1345 = 7.29 **bags of cement**. The quantities of materials for 1 m3 of **concrete** production can be calculated as follows: The weight of **cement** required = 7.29 x 50 = 364.5 kg. Weight of fine aggregate (sand) = 1.5 x 364.5 = 546.75 kg.

## How long do concrete footings take to dry?

If you use a concrete that has a quick setting additive you need to wait a minimum of one sunny day, if you are using a standard concrete footing mix I would recommend waiting for a minimum of **seven days** and a maximum of **28 days**, of course, that is if the conditions are right for the concrete to cure and set hard.

## Does a concrete slab need footings?

While not a requirement, a **concrete slab** foundation provides a solid, clean surface for your steel building and can help it last longer. Since the building will **require** anchoring to minimize shifting, pouring a **concrete slab** gives you a chance to pour **footings** as well.

## Can I use fast setting concrete for footings?

**Fast**–**setting concrete**, all-purpose gravel, QUIK-TUBE® building form. For structural or load-bearing applications, such as **concrete footings** for deck posts, or for securing any post in sandy soil, follow the steps on pages 59 to 60, **using concrete** forms to build the **footings** or **set** the posts.