1 yd3 at 1:2:3
- Adjusted concrete
- 1.1 yd3
- Cement
- 4.95 ft3
- Sand
- 9.9 ft3
- Gravel
- 14.85 ft3
Concrete mix design depends on strength, moisture, aggregate size, additives, and code requirements. This is a planning estimate for simple batches.
Concrete Mix Calculator
Use this free concrete mix calculator to estimate cement bags, sand, and gravel from cubic yards, 1:2:3 or 1:2:4 ratio parts, bag yield, and waste percent.
Inputs explainedResult checksExample valuesRuns in your browser
Formula steps
- Convert cubic yards to cubic feet and add waste.
- Add the cement, sand, and gravel ratio parts.
- Split the adjusted volume by the ratio and round cement bags up.
Examples
Recent answers
Recent concrete mix estimates will appear here.
Concrete mix estimates stay local and use simple ratio math for small-batch planning.
Inputs and recent answers stay in this browser tab and are not sent to a server.
How to use the Concrete Mix Calculator
- Enter concrete volume, cement:sand:gravel ratio parts, cement bag yield, and waste percent.
- Press Estimate mix to see adjusted concrete volume plus cement, sand, gravel, and rounded cement bags.
- A 1:2:3 ratio means one part cement, two parts sand, and three parts gravel by volume.
- Concrete strength depends on water, aggregate, curing, additives, and product or engineering specs.
What people use it for
Plan cement, sand, and gravel for small concrete batches.
Compare 1:2:3 and 1:2:4 style ratios.
Add waste before buying bagged materials.
Turn cubic yards into cubic feet, whole cement bags, sand, and gravel.
Check whether a slab batch estimate needs a ready-mix quote instead.
Quick examples
1:2:3 mix
1 yd3, 1:2:3 ratio, 1 ft3 bag yield, 10% waste5 cement bags, 9.90 ft3 sand, 14.85 ft3 gravel
Small 1:2:4 batch
0.25 yd3, 1:2:4 ratio, 1 ft3 bag yield, 8% waste2 cement bags, 2.08 ft3 sand, 4.17 ft3 gravel
Waste check
1 yd3 with 5% waste vs 10% waste28.35 ft3 vs 29.70 ft3 adjusted concrete
Bag yield check
4.95 ft3 cement, 0.75 ft3 bag yield7 cement bags
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Concrete Mix CalculatorSee slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- Home & ProjectsBrowse related calculators and utilities in the same category.
- Calculator and utility guidesFind more guides that use real tool inputs and example numbers.
- All free toolsSearch every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
When should I use the Concrete Mix Calculator?
Use it when your task matches one of these common needs: Plan cement, sand, and gravel for small concrete batches. Compare 1:2:3 and 1:2:4 style ratios. It works best when you already know the measurements, amounts, units, or options the page asks for.
What is the Concrete Mix Calculator doing with my inputs?
In plain language: The calculator converts cubic yards to cubic feet, adds waste, adds the cement, sand, and gravel parts, then gives each material its share of the adjusted volume. Cement bags are rounded up from the cement cubic feet and the bag yield you enter. The examples on the page are there so you can compare your inputs with a worked example before copying the answer.
What do the main Concrete Mix Calculator inputs mean?
Concrete volume: the final amount of concrete you want to make before waste is added. Mix ratio: cement, sand, and gravel parts by volume, such as 1:2:3 or 1:2:4. Cement bag yield: how many cubic feet one cement bag contributes. Use the bag or supplier label when you have it. Waste percent: extra material for spills, uneven measuring, low spots, and small batch losses.
How should I read the Concrete Mix Calculator answer?
Read the headline estimate first, then check the material, waste, coverage, and unit lines. For project tools, the supporting lines are often the difference between a rough idea and a list you can actually shop from.
What should I double-check before trusting the answer?
Concrete strength depends on water, aggregate, cement type, moisture, additives, curing, placement, and code requirements. This is a rough material takeoff, not an engineered mix design or safety sign-off. Also check the unit, scale, mode, and result limit because small input changes can change the answer.
What does a 1:2:3 concrete mix mean?
It means 1 part cement, 2 parts sand, and 3 parts gravel by volume. The calculator uses those parts to split the total adjusted volume.
What does a 1:2:4 concrete mix mean?
It means 1 part cement, 2 parts sand, and 4 parts gravel by volume. It uses more gravel than a 1:2:3 mix, so check your project instructions before choosing it.
Why does the calculator ask for cement bag yield?
Different bags and products can cover different volumes. The calculator divides cement cubic feet by the yield you enter, then rounds up to whole bags.
Does this estimate water?
No. Water amount affects workability and strength, so follow the cement or concrete product directions instead of guessing from this material split.
Can I use this as a sand and cement calculator?
Only if your job is still a concrete mix with a gravel part. This page requires cement, sand, and gravel parts; mortar-only or render mixes need a separate check.
Can this guarantee concrete strength?
No. Strength depends on the actual mix design, water ratio, aggregate, curing, and product instructions. Use a specified mix for structural work.
Is this enough for a slab?
It can help with material planning for a simple slab batch, but slab thickness, base prep, reinforcement, joints, drainage, and local code still need separate checks.
Does the site save what I enter?
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.