Best answer
Calculate the volume of the hole in cubic metres (using V = πr2h) and then subtract the volume of your post. This will give you the volume of concrete required. Simply multiply the volume figure by 108 (108 bags per cubic metre) to give the amount of 20kg bags needed to fill the void.
How many bags of concrete do I need for a 6x6 slab?
0.667 cu. yds. How many concrete bags would I need for a 6 ft x 6 ft x 6" slab? 29.9 x 80lb Concrete bags.
How do I calculate how much concrete I need for a slab?
CONCRETE CALCULATOR FORMULADetermine 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.More items...•
How much concrete do I need for a 12x20 slab?
Concrete Extras With a brief look, a 12x20 area at 6 inches deep, you would need approximately 6.31 tons or 4.44 cubic yards of gravel. Concrete reinforcing is also recommended in high traffic areas and medium to large areas.
How many bags of concrete do I need for a post hole?
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.
How many bags of concrete do I need for a 6x6 post?
As I recall, a 60# bag of concrete is about . 5cf, so you'd need 3 bags per hole.
How much concrete do I need for a deck post?
One 80-lb bag of concrete yields . 60 cubic feet when combined with 4 quarts of water. If you're purchasing 80-lb bags of concrete, you'll need 1.66 bags of concrete. As before, since bags of concrete are only sold in whole quantities, you'll need to purchase two (2) 60-lb.
How much sand and cement do I need for brickwork?
1:6 ratio of mortar for brickwork which means cement:sand = 1 part of cement and 6 parts of sand.
How much cement do I need for a brick wall?
Quantity of cement, Sand or Mortar Required for Brickwork: 1:6 ratio of cement mortar is usually used for brickwork.
How much sand and cement do I need for 100 blocks?
You will need 1000 lbs of sand for the mortar for those 100 blocks. The Recipe for Mortar sand mix will be 1 Part Mortar to 2-1/2 Parts Sand.
How much sand and cement do I need for 1000 blocks?
For laying bricks and blocks in normal applications (SABS Class II) To lay 1000 bricks = 3 bags cement + 0.6 cu. m. sand.
Related Question Answers

eckes
ProfessorHow much sand and cement do I need for blocks?
For every m2 of wall you will need ten concrete blocks. For every ten blocks you will need two 25kg bags of bricklaying mortar. If you are working on a larger project it may be more economical to mix your own mortar. For bricklaying you need to mix one part of cement to five parts building sand.

erluxman
ProfessorHow much cement do I need for 1m3 concrete?
Typically, 1m3 of concrete is made up of 350Kg of cement, 700Kg of sand, 1,200Kg of chippings and 150 Litres of water..

Mario F
ProfessorHow many bags of concrete do I need for a 8x8 slab?
How many concrete bags would I need for a 8 ft x 8 ft x 6" slab? 54 x 80lb Concrete bags. How much does it cost to pour a 8'x8' x6" slab? Ready-mix costs approx $277.86.

Alexander Artemenko
ProfessorHow much concrete do I need for a metal fence post?
Each hole for the terminal posts must be 8 inches in diameter and 30 inches deep, requiring 0.85 cubic feet of concrete to fill.

Martin Geisler
ProfessorHow long does it take quikrete high strength concrete mix to set?
10 - 12 hoursrequiring high early strength and rapid strength gains. QUIKRETE® 5000 sets quickly, making it ideal for cold weather applications. It has a walk-on time of 10 - 12 hours.

samabcde
ProfessionalHow much concrete do I need to set a deck post?
One 60-lb bag of concrete gives you . 45 cubic feet of concrete when mixed with 2.5 quarts of water. In order to have enough concrete for 1 cubic yard (27 cubic feet), you'll require 2.2 bags of 60-lb concrete.

Ben.S
ProfessionalHow much cement do I need for a 20x20 slab?
With a brief look, a 20x20 area at 6 inches deep, you would need approximately 10.52 tons or 7.41 cubic yards of gravel. Concrete reinforcing is also recommended in high traffic areas and medium to large areas.

nonopolarity
ProfessionalHow much concrete do I need for 2 post lift?
12,000 pound two-post lifts (and higher capacity): Six (6) inches of concrete at 3000 PSI is required.

bamtheboozle
ProfessionalHow do you mix all concrete rapid set?
CEMENT ALL may be mixed using 3 to 5 quarts (2.8 L to 4.7 L) of water per 55-lb (25-kg) bag. Use less water to achieve higher strengths. Do not exceed 5 quarts (4.7 L) of water per bag. For increased fluidity and workability, use Rapid Set® FLOW Control® plasticizing admixture from the Rapid Set® Concrete Pharmacy®.

Darkman
ProfessionalHow does rapid set concrete work?
Rapid Set Concrete is specially formulated to harden rapidly, so you can complete a job faster and have more time for other projects.
It is highly suitable for fixing fence and non-load bearing pergola posts, clothes hoists and many other non-structural uses..

snr
UserHow much crushed concrete do I need?
Beside above, how much crushed concrete do I need calculator? In the construction world, most materials are measured in cubic yards. Multiply the length (L), in feet, by the width (W), in feet, by the height (H), in feet, and divide by 27. This will tell you how many cubic yards of crushed stone you need.

hasen
UserHow much sand and cement do I need to build a block wall?
Concrete blocks are much easier to calculate. Each block is 450 x 215 x 100. Ten blocks will construct approximately 1 square meter of wall, with 1 bag of sand/cement mix enough for 10 blocks.

Dale K
UserHow long does it take for rapid set concrete to set?
15 minutesQuick Set Concrete attains initial setting in no more than 15 minutes under normal conditions and should be placed immediately upon mixing. Leave at least two hours after setting before applying any load.

Mariusz Pawelski
UserHow much concrete do I need for a mailbox post?
In most cases a 50-pound bag of quick-dry concrete should suffice. Saturate the concrete. For a 50-pound bag you will need about a gallon of water. Be sure to leave support beams in place for 4 to 6 hours or until concrete is dry.

galdin
UserHow many bags of concrete do I need for a 5x5 pad?
How many concrete bags would I need for a 5 ft x 5 ft x 6" slab? 20.8 x 80lb Concrete bags.

Sergey Pleshakov
GuestHow much concrete do I need to fill a 55 gallon drum?
As to how many bags....a 55 gallon drum filled clear to the top is actually closer to 60 gallons. And 60 gallons is 8 cu ft. So if you buy 60lb bags, those do 1/2 cu ft each so you would need 16 of them. IF you buy 80lb bags (2/3 cu ft) you would need 12 bags.

Lea Hayes
GuestHow long does quick dry cement take to dry?
20-40 minutesPRODUCT USE QUIKRETE® Fast Setting Concrete Mix is a general purpose concrete designed to achieve final set in 20-40 minutes. Fast Setting Concrete Mix is suitable for setting posts and pouring slabs when a rapid return to service is desired.

k_rus
GuestHow many bags of concrete do I need for a vinyl fence post?
How Much Concrete per Vinyl Fence Post?Post SizePost Height (above surface)80lb Bags Required4×43-4ft double-triple rail9 inch hole15×53-4ft double-triple rail12 inch hole15×55-6ft semi & privacy122

Tom Sharpe
GuestHow much concrete do I need for a 4 foot sonotube?
For example, a sono tube with a 10" diameter and a 4' depth requires 0.08 cubic yards of concrete..

Jota.Toledo
GuestHow much concrete do I need for a flagpole?
The depth of the hole should be 1/3-1/4 the post height above ground (i.e., a 6-foot tall would require a hole depth of at least 2 feet).

Kamal Nayan
GuestHow much concrete do I need for an inground pool?
Plan on at least 5 minutes per cubic yard, for unloading time. How much concrete do I need? Order this much concrete, for these standard pool sizes. 12 x 24 – 5 yards, 14 x 28 – 6 yards, 16 x 32 – 7 yards, 18 x 36 – 8 yards and a 20 x 40 – 9 yards.

Evk
GuestHow much concrete do I need for deck footings?
In order to have enough concrete for one cubic foot, you'll require 2.2 bags of 60-lb concrete.
Since bags are only sold in whole (not half, or quarter) quantities, you'll need to purchase three (3) 60-lb.
bags for one cubic foot..

Linda Paiste
GuestHow much concrete do I need to set a post?
Remember, the depth of the post hole should be one-half of the above-ground post height.
(Example: For a 6 feet above ground post, use a post with an overall height of 9 feet and place 3 feet in the ground).
The calculator will indicate the number of 50 lb.
bags of QUIKRETE® Fast-Setting Concrete you need..

Mohamed-Yousef
GuestCan I mix fast setting concrete with regular concrete?
As far as the original question by the OP, considering rapid set is just ordinary concrete mix with accelerant, there is clearly no harm in mixing a couple or even 3 ordinary concrete mix bags with one rapid set. The end result will be a faster curing mix.

linkyndy
GuestCan you mix fast setting concrete with regular concrete?
As far as the original question by the OP, considering rapid set is just ordinary concrete mix with accelerant, there is clearly no harm in mixing a couple or even 3 ordinary concrete mix bags with one rapid set.
The end result will be a faster curing mix..

Emerson Micu
GuestHow do I calculate how much concrete I need for my driveway?
Multiply the square footage by the depth in feet to find the volume of the space in cubic feet. Volume is found by measuring length × width × depth. Finally, divide the cubic footage by 27 to find the volume in cubic yards. This is the amount of concrete needed.

Tony The Lion
GuestHow much plaster do I need for a room?
Once you know how big the room is and ideally know how many square meters are in it, you can simply divide that figure by 9 to give you about how many bags of multi finish plaster you will need. Multi finish covers 10m2, but I say 9m2 to all allow for wastage.

thatguy
GuestHow do you reinforce concrete posts?
To begin reinforcing the post, dig a few inches of soil away from it around the perimeter. Fill the hole with approximately 6 inches of gravel. Top the gravel with rapid-set cement mix powder to fill the hole to 3 inches below the surface of the soil.

Vadzim
GuestHow many bags of concrete do I need for a flagpole?
If there is a layer of water across the top, you've added too much. The rule of thumb is about 5 pounds of water to an 80 pound bag of concrete mix.

Kris
GuestCan I use fast setting concrete in cold weather?
Because of the rapid setting time, special precautions must be taken, as set times will fluctuate in extremely hot or cold weather.
Use cold water or water mixed with ice cubes in severely hot weather.
Use hot water when mixing in severely cold weather..

peter
GuestCan I use rapid cement without sand?
Rapid setting cement can be extremely useful, it is more expensive than a traditional mortar mix but it cures much faster and can be used in areas where normal sand and cement cannot be used. ... Rapid setting cement is normally sold in buckets where you can just remove the lid, add water and start mixing.

Pshemo
GuestHow much concrete do I need for 1m3?
Various instructions and regulations therefore also state that you need about 56 packs of dry concrete of 40kg each for 1m³, which results in about 17.86 litres of liquid concrete per pack.

Sai Gopi Me
GuestHow much cement and sand do I need for floor tiles?
Mortar calculation for tile flooring We need 1.5 m3 volume of wet cement mortar that means, we need this much volume after adding water to cement and sand mix. Dry volume of mortar is considered as 25% of more of wet volume.

David Citron
GuestHow much concrete do I need for a post hole?
To calculate how much concrete you need, you need to know the post size you are going to use and how many posts you are installing. Your post diameter and height determine how big each hole needs to be. As stated above, fence post holes should be 3 times the diameter of your post and 1⁄3 as deep as your post.

Olical
GuestHow much grout do I need to fill concrete block?
Each 80 lb (36.3 kg) bag of QUIKRETE® grout will fill the cores of approximately 3 standard 8" × 8" × 16" (203 × 203 × 406 mm) block.

samthecodingman
GuestHow do you repair a concrete floor under a toilet?
You can always repair the concrete with some quick setting cement, and anchor the new flange that way.
I had a similar situation and hired a core driller to core a 14" diameter hole around the flange.
Chipped out the concrete with a little Bosch electric chisel.
Replaced the anchors and poured rapid set concrete..

Gordon Linoff
GuestHow much cement mix do I need?
To determine how many bags of concrete you will need, divide the total cubic yards needed by the yield. Use the following yields per each bag size: 40 pound bag yields .011 cubic yards. 60 pound bag yields .017 cubic yards.

not_speshal
GuestHow much concrete do I need for a 20x20 pad?
Concrete Slab Prices By SizeSlab SizeSquare FeetAverage Cost Installed15x15225$1,38820x20400$2,46824x24576$3,55420x30600$3,7026 more rows

Boris Strandjev
GuestHow much concrete sealer do I need?
Apply the Sealant Depending on how porous your concrete is, a gallon of sealer will cover 250 to 500 square feet.

Nathan Fellman
GuestHow much sand and cement do I need for 1000 bricks?
To lay 1000 bricks = 3 bags cement + 0.6 cu. m. sand. 1 Bag of cement to 3 wheelbarrows of building sand.

GManNickG
GuestHow much Venetian plaster do I need?
BUDGET: You can achieve a homemade Venetian plaster finish for roughly $6 to $11 per 100 square feet, considering you'll need $2 to $3 for pre-mixed joint compound, $0.10 to $0.50 for latex colorant, and $4 to $7 for tinted glaze.

Benny Neugebauer
GuestHow much concrete do I need for a 10 sonotube?
For example, a sono tube with a 10" diameter and a 4' depth requires 0.08 cubic yards of concrete.

TheMaster
GuestHow do I calculate how much cement I need?
How to calculate concrete: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.More items...•Apr 23, 2018

pbaranski
GuestHow do I calculate how much concrete I need?
Quantity of cement = 1/13 × 1.54 m3 × 1440 kg/m3 = 170 kg, no of bag cement for 1m3 m7. 5 concrete = 170/50 = 3.4. If rate of cement = INR 400 per bag, then cost of 3.4 bags cement = 3.4 ×400 = INR 1360.

HeberLZ
GuestHow do I figure out how many yards of concrete I need for a slab?
How do I calculate how much concrete I need for a slab?Measure the area in feet.Multiply length by width, and then by thickness.Divide the resulting number by 27 to find cubic yards.

Martin Tournoij
GuestHow do I figure out how many yards of concrete I need?
How do I calculate how much concrete I need for a slab?Measure the area in feet.Multiply length by width, and then by thickness.Divide the resulting number by 27 to find cubic yards..

Christofer Weber
GuestHow many 80lb bags of concrete do I need for a 10x10 slab?
For a 10 x 10 slab, you would need 77 60-pound bags or 60 80-pound bags. If we add an extra 10%, that's an extra 8 60-pound bags or 6 80-pound bags. Whatever the size of your project, use the formula above to calculate how much concrete you'll need!

WiredPrairie
GuestHow much sand and cement do I need for 1 cubic meter of concrete?
1 Cubic Meter of Concrete 1m3 of concrete = 150l water + 250kg cement + 700kg sand + 1200kg aggregates.

rioV8
GuestHow much sand and cement do I need for hollow blocks?
The mixing ratio is 1 part cement and 5 parts sand, and if the plaster is too harsh, 0.5 to 1 part of lime can be added.

Mạnh Quyết Nguyễn
GuestHow much cement and ballast do I need?
Mixing 1 part cement to 6 parts ballast creates concrete suitable for driveways, paths and patios, and increasing the ratio to 1:8 gives foundation-strength concrete..