How to Mix Quikrete
Mixing Quikrete Concrete Mix is mostly about one thing: getting the water right. Add the amount printed on the bag, work it until there are no dry pockets, and stop while the mix is still stiff enough to hold its shape. An 80 lb bag takes about 6 pints of water, which is 3 quarts. A 60 lb bag takes about 4 pints. A 40 lb bag takes about 3 pints. Those are Quikrete's own starting numbers. Get close to them and you get strong concrete. Overshoot them and you get a soupy batch that pours easy and cracks later.
This guide covers the whole job: the tools, the water amount for each bag size, how to tell when the consistency is right, and the single mistake that ruins more DIY concrete than anything else.
What you need
You do not need much to mix a few bags by hand.
- A wheelbarrow or a mixing tub (a plastic mortar tub works fine)
- A hoe or a flat shovel
- A bucket you can measure water in
- Waterproof gloves and eye protection (wet cement is caustic and will burn skin over time)
For anything past six or eight bags, rent a barrel mixer. Turning a full wheelbarrow of stiff concrete by hand is real work, and by the fourth bag most people start adding water just to make the mixing easier, which is exactly how a batch gets ruined.
Water per bag (Quikrete's numbers)
Quikrete lists a starting water amount for every bag size of Concrete Mix. Start a little under these, not over, because you can always add a splash more but you cannot take water back out.
| Bag size | Water (start with) | In quarts | In gallons | Yield |
|---|---|---|---|---|
| 40 lb | ~3 pints (1.4 L) | 1.5 qt | 0.4 gal | ~0.30 cu ft |
| 60 lb | ~4 pints (1.9 L) | 2 qt | 0.5 gal | ~0.45 cu ft |
| 80 lb | ~6 pints (2.8 L) | 3 qt | 0.75 gal | ~0.60 cu ft |
| 90 lb | ~7 pints (3.3 L) | 3.5 qt | 0.9 gal | ~0.675 cu ft |
Those water figures and yields come straight off the QUIKRETE Concrete Mix No. 1101 data sheet. Note the yield, because it decides how many bags you buy. An 80 lb bag makes about 0.6 cubic feet of concrete, so it takes roughly 45 of them to fill a cubic yard. If you are trying to figure out a bag count for a slab or footing, run it through the Quikrete bag calculator or read how many bags of Quikrete you need before you load the truck at the store.
Rule: start with about 2/3 of the listed water, mix, then add the rest slowly until it looks right.
That is Quikrete's own method, and it is the habit that keeps you out of trouble. If you dump all the water in at once you will almost always end up too wet.
How to mix Quikrete by hand
This is the wheelbarrow or tub method for a handful of bags.
1. Empty the bag and make a well. Pour the dry mix into the wheelbarrow or tub and pull it into a ring with a hollow in the middle, like a volcano.
2. Pour in about two-thirds of the water. For an 80 lb bag that is roughly 2 quarts of your 3. Pour it into the hollow so it does not run over the sides.
3. Work it with the hoe. Drag the dry mix in from the edges into the water, chopping and folding until the water is soaked up. Keep working the whole batch so nothing stays dry in the corners.
4. Add the rest of the water a little at a time. Add a cup or two, mix, look, repeat. Stop the moment the mix is uniform and workable. You are aiming to just wet everything, not to make it flow.
Quikrete describes the target this way: properly mixed concrete "should look like thick oatmeal and should hold its shape when it is squeezed in a gloved hand" (QUIKRETE hand-mixing instructions). That squeeze test is the best field check there is. Grab a handful in a gloved hand, close your fist, and open it. If it holds the shape of your fingers and does not slump into a puddle, you are there. If water runs out and it collapses, it is too wet.
How to mix Quikrete in a mixer
For bigger pours, a rented barrel mixer changes the order of operations. You put water in first.
1. Add water first. Measure the water for the number of bags you are running and pour about half of it into the spinning drum before any dry mix goes in. This keeps mix from caking on the bottom.
2. Add the dry mix and run it. With the mixer turning, add the bags, let it turn about a minute, then add the rest of the water as needed.
3. Mix 3 to 5 minutes. Quikrete says to "mix the concrete for about 3-5 minutes, until a uniform, workable consistency is achieved" (QUIKRETE machine-mixing instructions). Same oatmeal-that-holds-its-shape target as hand mixing. A 3 cubic foot barrel mixer will comfortably handle a couple of 80 lb bags at a time.
4. Dump and go. Tip the running drum into a wheelbarrow and place the concrete. Do not let a wet batch sit and stiffen in the mixer.
Let it slake, then remix
After the mix looks uniform, give it two or three minutes to sit, then turn it once more. This short rest lets the cement and sand finish soaking up water, and stray dry pockets that were hiding in the middle show themselves. Concrete guys call this slaking. It is a light habit rather than a hard rule for Concrete Mix, and it costs you nothing. Do not use the rest as an excuse to pour in more water. Nine times out of ten the batch is fine and just needed a minute.
The number one mistake: too much water
A wetter mix is easier to mix, easier to pour, and easier to trowel flat. That is exactly why so many people overwater, and it is the mistake that quietly wrecks the concrete. Water is what lets the cement chemically harden, but past the amount the cement can use, the extra water just leaves bleed channels and pores behind as it evaporates. More pores means weaker, more crack-prone concrete.
Quikrete puts an actual number on it: "adding one extra quart of water per 80 lb bag can reduce the strength of the concrete by up to 40%" (QUIKRETE hand-mixing instructions). One quart. That is a coffee mug and a half of extra water taking nearly half the strength out of your slab. There is no fixing it after the fact, and it will not show up until the concrete cracks or spalls months later.
So err dry. A stiff mix that takes some muscle to place is stronger than a loose one that flows into the corners by itself. If a batch does come out too wet, the clean fix is to open another bag and work some dry mix into it to bring the ratio back, not to pour it anyway and hope.
Contractors say the same thing in plainer terms. On The Garage Journal forum, where members worked out the water for a 23-bag pour, one poster's rule was "1 gal per 90 lb bag or just under," and another made the point that matters most for the days after: concrete "cures and does not dry, and in the absence of enough moisture content you could end up with substandard concrete." Mix stiff, then keep it damp while it cures. That is the whole game.
What "the right consistency" looks like
Quick reference for the two ways it goes wrong:
| Look | Squeeze test | Verdict |
|---|---|---|
| Crumbly, dry pockets, gray dust | Falls apart, will not hold a shape | Too dry, add water in small splashes |
| Thick oatmeal, wet sheen | Holds finger marks, does not slump | Right, place it now |
| Glossy, soup, water pooling on top | Runs through your fingers, collapses | Too wet, add dry mix to correct |
The wet sheen without standing water is the sweet spot. If there is a puddle sitting on the surface after you stop mixing, you went too far.
When you do not mix at all: fence posts
Not every Quikrete job gets mixed in a wheelbarrow. For setting fence posts, deck posts, and mailboxes, Quikrete Fast-Setting Concrete Mix is designed to go into the hole dry. You brace the post, "pour the dry concrete from the bag right into the hole, then add water," and the mix hydrates in place. It "sets up in 20 to 40 minutes," and you can hang real weight on the post after about 4 hours (QUIKRETE setting posts). No tub, no hoe, no mixing. That method only works with the Fast-Setting formula, not regular Concrete Mix, and it has its own steps, so follow the guide to setting fence posts with Quikrete rather than winging it.
After the pour: curing
Mixing it right is half the job. The other half is not letting it dry out too fast. Quikrete Concrete Mix wants roughly 5 days of curing in warm weather at 70 F or above, and about 7 days when it is cooler, between 50 and 70 F (data sheet). Keep the surface damp over that stretch, especially the first couple of days, or you undo some of the strength you were careful to mix in. The full timeline, from when you can walk on it to when it hits full strength, is in the Quikrete set, cure, and dry time guide.
For more projects, mixes, and bag-count help, the Quikrete guide hub ties all of it together.
Sources
- QUIKRETE Concrete Mix No. 1101 data sheet (PDF) - official water amounts per bag size, yields, and cure times.
- QUIKRETE hand-mixing instructions - the thick-oatmeal consistency test and the "one extra quart can cut strength by up to 40%" warning.
- QUIKRETE machine-mixing instructions - water-first order, 3 to 5 minute mixing time, and mixer capacity.
- QUIKRETE setting posts - dry-in-the-hole method and set times for Fast-Setting Concrete Mix.
- The Garage Journal, "How much water needed to mix with each concrete bag" - contractor consensus on water per bag and the cure-not-dry point.
Frequently asked questions
How do you mix Quikrete?
Empty the bag into a wheelbarrow or tub, make a well in the middle, and pour in about two-thirds of the recommended water. Work it with a hoe, adding the rest of the water slowly, until it looks like thick oatmeal and holds its shape when squeezed. Stop while it is still stiff, and never chase an easier mix by adding extra water.
How much water for a 60 lb bag of Quikrete?
About 4 pints, which is 2 quarts or half a gallon, per Quikrete's Concrete Mix data sheet. Start a little under that, mix, and add the last bit only if the batch still has dry pockets.
How much water for an 80 lb bag of Quikrete?
About 6 pints, which is 3 quarts or three-quarters of a gallon. Quikrete lists this as the starting amount for an 80 lb bag of Concrete Mix.
How do you know when Quikrete is mixed right?
It should look like thick oatmeal with a wet sheen and no standing water on top. Squeeze a gloved handful: if it holds the shape of your fingers without slumping into a puddle, it is ready. If it crumbles it needs more water, and if it runs through your fingers it is too wet.
How to use Quikrete for fence posts?
Use Fast-Setting Concrete Mix, not regular Concrete Mix. Set and brace the post, pour the dry mix into the hole around it, then add water on top. It sets in 20 to 40 minutes and holds weight after about 4 hours, with no mixing required.
What happens if you add too much water to Quikrete?
It gets weaker. Quikrete says one extra quart of water per 80 lb bag can cut the concrete's strength by up to 40 percent. The mix is easier to work when it is wet, but the extra water leaves pores behind that make the finished concrete crack and spall.