Scale A Concrete Mix Using Your Own Cement, Sand And Aggregate Ratio. Choose A Target Batch Volume, Start From A Cement Quantity, Compare Two Mix Ratios Or Add A Water-Cement Ratio For Basic Water Planning. The Calculator Shows Relative Parts And Scaled Material Quantities Without Assuming One Fixed Mix Is Suitable For Every Project.
All Calculator Fields Start Blank With A Soft Zero Placeholder. Type Your Own Mix Proportions And Quantities; The Zero Will Not Be Added In Front Of Your Number. Results Stay Hidden Until You Press Calculate Mix Proportions.
Your Result Will Appear Here After You Press Calculate Mix Proportions.
The PDF Includes The Selected Calculation Mode, User-Entered Ratio, Scaled Material Quantities And Water Planning Where Applicable.
A Ratio Such As Cement : Sand : Aggregate Describes Relative Parts. Add The Parts Together, Then Divide The Target Batch Quantity By The Total Parts To Find The Size Of One Part.
Use The Calculator To Scale A Ratio, Start From Cement, Add A Project-Specified Water-Cement Ratio Or Compare Two Relative Mixes.
See The Cement Portion As Relative Parts Or As A Scaled Quantity.
Calculate The Sand Quantity From The Same Ratio And Scale Factor.
Scale The Aggregate Portion Without Changing The Original Ratio.
Multiply Cement Mass By A User-Entered Water-Cement Ratio To Estimate Water Mass.
Increase Or Reduce The Whole Mix While Keeping The Same Relative Proportions.
Save The Ratio And Scaled Quantities With The Site Name For Easy Reference.
A Concrete Mix Ratio Is A Relative Relationship Between Materials. A Three-Part Ratio Written As Cement : Sand : Aggregate Does Not Automatically State Kilograms Or Cubic Metres. It Simply Says How Large Each Material Share Is Compared With The Others.
To Scale The Ratio, Add All Parts Together. Divide Your Target Quantity By The Total Parts To Find One Part, Then Multiply One Part By The Cement, Sand And Aggregate Numbers.
Total Parts = Cement Parts + Sand Parts + Aggregate Parts
One Part = Target Quantity ÷ Total Parts
Material Quantity = Material Parts × One Part
A 1 : 2 : 4 Ratio Has Seven Total Parts. If You Want To Split A Combined Dry Volume Of 0.70 m³ Using That Ratio, One Part Is 0.10 m³. The Relative Split Is 0.10 m³ Cement, 0.20 m³ Sand And 0.40 m³ Aggregate.
| Example Ratio | Total Parts | Cement Share | Sand Share | Aggregate Share |
|---|---|---|---|---|
| 1 : 2 : 4 | 7 | 14.29% | 28.57% | 57.14% |
| 1 : 1.5 : 3 | 5.5 | 18.18% | 27.27% | 54.55% |
| 1 : 3 : 6 | 10 | 10.00% | 30.00% | 60.00% |
| 1 : 2.5 : 5 | 8.5 | 11.76% | 29.41% | 58.82% |
If You Already Know The Cement Quantity, Divide It By The Cement Part To Find The Quantity Represented By One Part. Then Multiply That Part Quantity By The Sand And Aggregate Parts.
One Part = Cement Quantity ÷ Cement Parts
Water-Cement Ratio Is Usually Expressed As The Mass Of Water Divided By The Mass Of Cement. The Calculator Does Not Choose The Correct Ratio. It Only Multiplies The Cement Mass By The Ratio You Enter.
Water (kg) = Cement Mass (kg) × Water-Cement Ratio
Because One Litre Of Water Has A Mass Of About One Kilogram Under Ordinary conditions, the calculated water mass is numerically close to litres for basic planning. Actual batching should still follow the project mix design and account for moisture in aggregates and any admixtures.
Sand And Aggregate Can Contain Water. If Their Moisture Is Ignored, The Actual Water Entering The Mix Can Be Higher Than The Added Water Alone. That Can Change Workability And Effective Water-Cement Ratio.
A Ratio By Loose Volume Is Not Automatically The Same As A Ratio By Mass. Cement, sand and aggregate have different bulk densities. Keep the basis of the ratio consistent when scaling a mix.
The Compare Mix Ratios Option Converts Each Mix Into Percentage Shares. This Makes It Easier To See Which Ratio Has A Higher Or Lower Relative Cement, sand or aggregate content without assuming either mix is suitable for a specific use.
This Tool Does Not Select Compressive Strength, durability class, slump, maximum aggregate size, cement type, admixtures, air content, water-cement ratio or compliance requirements. Use A Project-Specific Mix Design Or Supplier Specification For Structural Concrete.
Keep The Ratio Basis, Quantity Basis And Water Assumptions Clear Before You Batch.
Enter The Cement, Sand And Aggregate Parts From Your Project Mix.
Add The Three Numbers To Find The Total Relative Parts.
Divide Your Target Quantity By Total Parts To Find One Part.
Use Only The Water-Cement Ratio Required By The Actual Mix Design.
These Examples Show Ratio Mathematics Only. They Do Not Recommend A Mix For Structural Or Durability Performance.
| Ratio Example | Target Quantity | Cement | Sand | Aggregate |
|---|---|---|---|---|
| 1 : 2 : 4 | 0.70 m³ | 0.10 m³ | 0.20 m³ | 0.40 m³ |
| 1 : 1.5 : 3 | 0.55 m³ | 0.10 m³ | 0.15 m³ | 0.30 m³ |
| 1 : 3 : 6 | 1.00 m³ | 0.10 m³ | 0.30 m³ | 0.60 m³ |
| 1 : 2.5 : 5 | 0.85 m³ | 0.10 m³ | 0.25 m³ | 0.50 m³ |
Simple Answers About Mix Ratios, Batch Scaling, Cement, Sand, Aggregate And Water-Cement Ratio.
Add The Ratio Parts, Divide The Target Quantity By The Total Parts, Then Multiply One Part By Each Material's Ratio Number.
It Means One Relative Part Cement, Two Parts Sand And Four Parts Aggregate. It Does Not By Itself Specify Kilograms Or Cubic Metres.
Yes. Use The Start From Cement Option. The Calculator Scales Sand And Aggregate From The Cement Quantity And Ratio.
Yes. Enter Cement Mass And A Project-Specified Water-Cement Ratio. The Calculator Multiplies Them To Estimate Water Mass.
No. It Only Scales The Ratio You Enter. It Does Not Design Structural Concrete.
The Zero Is Only A Placeholder. When You Type A Number, It Replaces The Placeholder And No Leading Zero Is Added.
Yes. The Compare Mix Ratios Option Shows Each Mix As Percentage Shares Of Cement, Sand And Aggregate.
No. Moisture Corrections, admixtures and detailed batching adjustments must come from the actual mix design or batching procedure.
No. Different materials have different densities, so volume and mass ratios should not be treated as interchangeable without proper conversion data.
The PDF Includes The Selected Calculation Mode, ratio, scaled material quantities and water planning where applicable, with Generated By ConcreteCreek.com.
Use Project Specifications, Supplier Mix Information And Australian Safety Guidance Alongside Any Simple Ratio Calculator.
Australian Industry Information And Technical Resources For Concrete Construction.
Visit CCAANational Safety Information About Silica And Concrete-Related Work Hazards.
Read Silica GuidanceUse Supplier Mix Specifications And Batching Information For Ready-Mix Concrete.
Use The Required Mix Design, Strength, Durability And Water-Cement Requirements For The Actual Work.