Ready Mix Concrete Calculator
Combine one or more pours, round the supplier order, and plan full or partial concrete truckloads.
How to measureKnown-volume workflow
Delivery and truck settings0.25 yd³ increments · 10 yd³ truck
Use the values from the supplier quote. Truck capacity, minimums, order increments, and short-load rules vary.
Add supplier pricingNot added
Supply estimate only. Labor, excavation, forms, reinforcement, pumping, finishing, permits, and placement are excluded.
Compare with bagged concreteOff
Use the actual mixed yield printed on the product label when it differs from a preset.
How to Use
- Choose a route - enter a volume you already know, or combine several rectangular, round, and known-volume pours.
- Set contingency - use the allowance appropriate for forms, excavation, spillage, and measurement uncertainty.
- Match the supplier - enter the plant's order increment, minimum order, truck capacity, and short-load threshold.
- Review the truck plan - the result separates full loads from the final partial load and shows final-load utilization.
- Confirm before ordering - verify mix specification, access, fees, placement plan, and discharge requirements with the producer.
Ready-mix concrete is ordered by volume, usually in cubic yards in the United States. This calculator can start from a known volume or combine several pours, add a contingency allowance, round up to the supplier's order increment or minimum, and divide the planned order into full and partial truckloads. Supplier rules vary, so the plant's quoted increment, truck capacity, minimum order, and short-load policy should govern the final call.
From Calculated Volume to a Truck Plan
How to Plan a Ready-Mix Order
Use known-volume mode when plans or another calculator already provide cubic yards or cubic metres. Use the multiple-pour mode when one delivery must cover several rectangular or round placements. The calculator totals each row before adding contingency, supplier rounding, and minimum-order rules, so the mathematical requirement remains visible beside the volume you may actually purchase.
If the project is a single slab, cross-check its geometry with the concrete slab calculator, which also compares bagged mix against delivery. The Ready Mix Calculator is broader at the ordering stage: it can combine separate pours and turn the combined volume into a supplier and truck plan.
Truck access, washout, forms, reinforcement, crew, finishing equipment, and placement must be ready before delivery. Confirm the mix designation, slump, air content or admixtures, allowable discharge conditions, truck capacity, order increment, minimum billed volume, and all delivery or short-load charges directly with the producer.
Information to Confirm With the Ready-Mix Supplier
Supplier policies vary too much for one national default. Ask for the values below and enter them in the calculator when they affect the order:
| Supplier detail | Why it matters | Where it appears |
|---|---|---|
| Order increment | The smallest volume step the plant will accept, such as a quarter yard or tenth of a cubic metre. | Rounds the calculated requirement upward. |
| Minimum order or billed volume | A small pour may be billed at a larger minimum even when less concrete is required. | Separates required volume from planned/billable volume. |
| Truck capacity | Mixer capacity depends on the producer and equipment rather than one universal ten-yard value. | Determines full loads, final partial load, and truck visits. |
| Short-load threshold and fee | Some suppliers charge when a delivery or final load falls below a stated amount. | Flags the condition and estimates the fee only from your quoted rule. |
| Price per yard or metre | Mix design, quantity, location, and supplier affect the quote. | Calculates concrete material supply cost. |
| Delivery, fuel, and tax | These may be flat, distance-based, taxable, or included in the quote. | Builds the optional supply-cost breakdown. |
Leave optional supplier fields at zero when they do not apply. The quantity and truck plan remain available without pricing.
Formulas Used in the Ready-Mix Calculator
The calculator normalizes every pour to one volume, then applies ordering rules in a fixed sequence:
Round pour = π × Radius² × Thickness
Combined volume = Sum of every pour × row quantity
Required volume = Combined volume × (1 + Contingency %)
Rounded supplier order = Required volume rounded up to the supplier increment
Planned order = Greater of rounded requirement or supplier minimum
Truck visits = Full loads + one visit when a partial final load remains
Short-load amount = Short-load threshold − final partial load, when positive
The result never hides supplier rounding or minimums inside the base volume. That distinction makes it possible to compare the concrete physically required with the amount that may be ordered or billed.
Ready-Mix Planning Terms
| Term | Meaning | Calculator treatment |
|---|---|---|
| Calculated volume | Concrete represented by the entered geometry or known-volume rows. | Shown before contingency. |
| Contingency | Additional concrete for measurement uncertainty, irregular forms, excavation variation, or spillage. | Displayed as a separate volume. |
| Order increment | The supplier's accepted volume step. | The requirement is rounded upward. |
| Supplier minimum | The smallest order or billed amount accepted by the producer. | Applied only when greater than the rounded requirement. |
| Truck capacity | Concrete assigned to one mixer load. | Editable; used for full and partial load planning. |
| Short load | A delivery or final partial load below the supplier's stated threshold. | Flagged only when a threshold is entered. |
| Final-load utilization | The partial final load divided by entered truck capacity. | Helps users understand how lightly loaded the final visit may be. |
These are planning definitions, not universal supplier rules. Use the numbers stated in the producer's quote or order terms.
Sources & Standards
- NRMCA guidance notes that truck-mixer capacity varies and recommends ordering additional concrete for normal estimating contingencies rather than assuming plan dimensions will match field conditions perfectly.NRMCA CIP 31 - Ordering Ready Mixed Concrete
- Ready-mixed concrete production, ordering, delivery, and acceptance are governed by project specifications and ASTM C94/C94M. The purchaser and producer should agree on order requirements, including any discharge limitations, instead of relying on one universal countdown.ASTM C94/C94M - Standard Specification for Ready-Mixed Concrete
- Standard bag comparisons use published mixed yields rather than bag weight alone. Check the actual product label when comparing bagged concrete with a ready-mix order.QUIKRETE Concrete Mix product data
After You Know Your Yardage
The yardage is what you phone in to the plant. The usual order of business around it:
Need installed prices, not just delivered material? Our concrete slab installed cost breakdown for 2026 shows real contractor pricing by slab size, finish, and region - with labor and prep included.
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Get your cubic yard quantity first, then order ready-mix. Browse the construction calculator collection.