Calculate How Much Concrete You Need In Cubic Yards And Cubic Metres For Common Projects. Choose A Slab Or Pad, Strip Footing, Round Column Or Post, Or Multiple Concrete Sections. Add A Waste Allowance, 20 Kg Bag Yield And Your Own A$/m³ Concrete Rate To Build A Clear Yardage, Metric Volume And Cost Estimate.
Select The Shape That Best Matches Your Project. Every Calculator Entry Displays Zero As A Placeholder Without Forcing A Leading Zero While You Type. The Result Stays Hidden Until You Press Calculate Concrete Yardage.
Your Result Will Appear Here After You Press Calculate Concrete Yardage.
The PDF Includes The Project Shape, Measurements, Cubic Yard Result, Cubic Metre Equivalent, Base Concrete Volume, Waste Allowance, 20 Kg Bag Estimate And Concrete-Only Cost.
Concrete Yardage Is A Volume Expressed In Cubic Yards. This Calculator First Works Out The Project In Cubic Metres From Your Metric Measurements, Adds The Waste Allowance, Then Converts The Final Volume To Cubic Yards Using 1 m³ = 1.30795 yd³.
The Main Result Is Cubic Yards, With The Cubic Metre Equivalent Kept In The Result Description And PDF. Separate Figures Show Base Concrete, Waste, 20 Kg Bags And Concrete-Only Cost.
See The Geometric Concrete Volume Converted From Cubic Metres Into Cubic Yards Before Waste Is Added.
Add A Percentage For Minor Measurement Differences, Spillage And Real Site Conditions.
Combine The Base Volume And Waste Into One Final Planning Yardage, With A Cubic Metre Equivalent For Ordering.
Estimate Whole Bags Using The Yield From The Exact Product You Plan To Buy.
Multiply The Final Cubic Metre Quantity By Your Own Local A$/m³ Ready-Mix Rate While Still Viewing Yardage.
Save The Main Measurements, yd³ Result, m³ Equivalent And Cost Estimate With The Site Name For Reference.
Concrete Yardage Means Concrete Volume Expressed In Cubic Yards (yd³). In Australia, Ready-Mix Concrete Is Normally Quoted And Ordered In Cubic Metres (m³), So This Calculator Shows The Yardage Result While Keeping The Metric Volume Available. To Calculate Volume Correctly, You Need The Length, Width And Depth Of Each Concrete Section. For Round Columns Or Post Holes, Use Diameter And Height Or Depth Instead.
The Most Reliable Way To Build A Concrete Yardage Estimate Is To Calculate Each Part Of The Project Separately. A Slab, Footing, Apron, Edge Beam Or Round Column Can Each Have A Different Shape And Depth. Once The Individual Volumes Are Known, Add Them Together, Apply A Practical Waste Or Contingency Allowance, Then Convert The Final Cubic Metres To Cubic Yards.
Concrete Volume (m³) = Length (m) × Width (m) × Depth (m)
If A Slab Is 6 m Long, 4 m Wide And 100 mm Deep, Convert 100 mm To 0.10 m. The Base Volume Is 6 × 4 × 0.10 = 2.40 m³.
Concrete Yardage (yd³) = Cubic Metres (m³) × 1.30795
Using The Same Example, 2.40 m³ × 1.30795 = 3.14 yd³ Before Waste. If You Add A 10% Allowance, The Planning Volume Becomes 2.64 m³, Which Is About 3.45 yd³. For Australian Ready-Mix Orders, Confirm The Final m³ Quantity With Your Supplier Even When You Use Yardage For Comparison Or Project Planning.
A Straight Strip Footing Uses The Same Basic Rectangular Formula. Add The Total Footing Length In Metres, Then Convert Width And Depth From Millimetres To Metres Before Multiplying.
Footing Volume = Total Length × Width × Depth
A Round Column Is A Cylinder. Divide The Diameter By Two To Find The Radius, Square The Radius, Multiply By π, Then Multiply By Height Or Depth. If You Have More Than One Identical Column, Multiply By The Quantity.
Volume = π × Radius² × Height
For Repeated Identical Sections, Calculate The Volume Of One Section Then Multiply By The Number Of Sections. If You Already Know The m³ Volume Per Section, The Multiple Sections Option Lets You Enter That Directly And Add A Small Known Extra Volume If Needed.
| Concrete Section | Example Measurements | Base Formula | Example Volume |
|---|---|---|---|
| Rectangular Slab | 6 m × 4 m × 100 mm | 6 × 4 × 0.10 | 2.40 m³ |
| Strip Footing | 20 m × 400 mm × 300 mm | 20 × 0.40 × 0.30 | 2.40 m³ |
| Round Column | 400 mm Diameter × 2 m | π × 0.20² × 2 | 0.25 m³ |
| 4 Identical Pads | 0.50 m³ Each | 0.50 × 4 | 2.00 m³ |
Many Concrete Drawings And Site Measurements Use Millimetres For Depth, Width Or Diameter. Before You Use A Cubic-Metre Formula, Convert Millimetres To Metres By Dividing By 1000.
| Millimetres | Metres | Common Use |
|---|---|---|
| 75 mm | 0.075 m | Thin Concrete Layer Example |
| 100 mm | 0.100 m | Common Calculation Example |
| 125 mm | 0.125 m | Thicker Slab Example |
| 150 mm | 0.150 m | Heavy Slab Example |
| 300 mm | 0.300 m | Footing Depth Example |
| 400 mm | 0.400 m | Footing Width Or Diameter Example |
Waste Or Contingency Is Added After The Base Geometric Volume Is Calculated. It Provides A Small Buffer For Minor Measurement Variation, Uneven Excavation, Form Movement, Spillage Or Other Real Site Conditions.
Final Quantity = Base Volume × (1 + Waste Percentage ÷ 100)
Bag Quantity Depends On The Finished Yield Of The Exact Product. A 20 Kg Bag Weight Does Not Automatically Equal One Fixed Concrete Volume. Enter The Manufacturer-Stated Yield Per Bag, Then Divide The Final Concrete Quantity By That Yield And Round Up To A Whole Bag.
20 Kg Bags = Final Concrete Quantity ÷ Yield Per Bag
For Larger Projects, Concrete Is Often Ordered In Cubic Metres From A Ready-Mix Supplier. Use The Calculator Result As A Planning Figure, Then Discuss The Final Order Quantity, mix specification, site access and delivery conditions with the supplier.
The Calculator Multiplies The Final Cubic Metre Volume By The A$/m³ Rate You Enter. The Same Result Is Also Converted To Cubic Yards For Yardage Planning. The Cost Is Concrete-Only And Does Not Automatically Include Delivery, Short-Load Charges, Pumping, Labour, Reinforcement, Formwork, Excavation, Finishing Or Other Project Costs.
A Project Can Have Several Different Concrete depths and shapes. A slab may be 100 mm deep, while a strip footing is 300 mm deep. A thickened edge may use extra concrete around the perimeter. Calculating these separately makes the final quantity easier to check.
This Tool Does Not Decide Concrete Strength, Slab Thickness, Reinforcement, Footing Size, Column Size, joint layout, exposure classification or structural requirements. Those decisions must come from the appropriate project specification, plans or professional advice.
Keeping Each Step Separate Makes It Easier To Check The Yardage, Metric Volume And Waste Allowance Before You Order.
Measure Length, Width, Depth, Diameter Or Section Quantity.
Convert Millimetres To Metres Before Calculating Cubic Metres.
Work Out The Base m³ Volume For Each Concrete Section.
Add A Practical Allowance And Review The Final Yardage And m³ Quantity.
These Examples Show Both Cubic Metres And Approximate Cubic Yards. Final Project Requirements And Waste Can Change The Order Quantity.
| Project Example | Measurements | Base Volume | With 5% Waste | With 10% Waste |
|---|---|---|---|---|
| Small Pad | 2 m × 2 m × 100 mm | 0.40 m³ / 0.52 yd³ | 0.42 m³ / 0.55 yd³ | 0.44 m³ / 0.58 yd³ |
| Patio Slab | 5 m × 4 m × 100 mm | 2.00 m³ / 2.62 yd³ | 2.10 m³ / 2.75 yd³ | 2.20 m³ / 2.88 yd³ |
| Garage Slab | 6 m × 6 m × 100 mm | 3.60 m³ / 4.71 yd³ | 3.78 m³ / 4.94 yd³ | 3.96 m³ / 5.18 yd³ |
| Strip Footing | 20 m × 400 mm × 300 mm | 2.40 m³ / 3.14 yd³ | 2.52 m³ / 3.30 yd³ | 2.64 m³ / 3.45 yd³ |
| Round Column | 600 mm Dia × 2 m | 0.57 m³ / 0.75 yd³ | 0.59 m³ / 0.77 yd³ | 0.62 m³ / 0.81 yd³ |
The Formula Is Straightforward, But Real Sites Can Use More Or Less Concrete Than A Perfect Geometric Shape.
Simple Answers About Cubic Yards, Cubic Metres, Waste, Bags, Slabs, Footings And Concrete Yardage.
For A Rectangular Section, Multiply Length By Width By Depth In Metres, Add Any Other Sections And Waste, Then Convert The Final m³ Volume To yd³ By Multiplying By 1.30795.
Both Units Measure Volume. One Cubic Metre Equals About 1.30795 Cubic Yards, While One Cubic Yard Equals About 0.76455 Cubic Metres. Australian Ready-Mix Suppliers Commonly Quote In m³, So Confirm The Metric Quantity Before Ordering.
Divide By 1000. Therefore 100 mm = 0.10 m.
Yes. Enter Total Footing Length In Metres And Width And Depth In Millimetres.
Yes. Enter Diameter, Height Or Depth, And Quantity. The Calculator Uses The Cylinder Volume Formula.
There Is No Universal Percentage. The Appropriate Allowance Depends On Measurement Accuracy, excavation, formwork and site conditions.
Divide The Final Concrete Quantity By The Manufacturer-Stated Yield Per Bag And Round Up To A Whole Bag.
Each Numeric Field Is Empty But Displays A Zero Placeholder. This Keeps The Starting State Clear Without Forcing A Leading Zero When You Type A Number.
Yes. Enter Your Own A$/m³ Rate To Estimate Concrete Material Cost. Delivery, labour and other project costs are not automatically included.
The PDF Includes The Project Shape, Measurements, Cubic Yard Result, Cubic Metre Equivalent, Base Volume, Waste Allowance, 20 Kg Bag Estimate And Concrete-Only Cost.
Check Current Product Information, Supplier Advice And Australian Safety Guidance Before Ordering Or Carrying Out Concrete Work.
Australian Industry Information And Technical Resources For Concrete Construction.
Visit CCAANational Safety Information About Silica And Concrete-Related Work Hazards.
Read Silica GuidanceExample Australian Product Information For Packaged General Purpose Concrete.
View Product InformationConfirm Final m³ Quantity, Mix Requirements, Delivery Conditions And Supplier Fees Before Ordering.