TryBuildCalcReady-Mix Concrete Order Calculator(Volume, Truck Loads & Cost)
Calculate ready-mix concrete order volume, transit mixer truck loads, estimated pour time, and cost from your pour dimensions or a known volume.
Find out how many transit mixer loads your pour needs and avoid an unplanned top-up order or an unexpected small-load surcharge.
Calculate ready-mix concrete order volume and truck loads.
🕒 Last updated: August 24, 2026
Inputs
ℹ️For a slab or footing, use the poured thickness. For a column or wall, use it as the effective depth for a simple rectangular volume.
Order Settings
ℹ️For reference and cost planning only — confirm the actual required grade against your structural drawings.
ℹ️Common truck sizes range roughly 4-10 m³ depending on region and supplier fleet.
ℹ️Optional. Enter 0 if your supplier has no minimum. Orders below this may attract a small-load surcharge.
ℹ️Affects the estimated per-truck unloading time used for the pour time estimate.
Cost Settings
Order Volume (Including 3% Wastage): 9.27 m³
Theoretical Volume: 9.00 m³ (317.8 cft)
Order Volume: 327.4 cft (12.12 yd³)
Concrete Grade: M25
Transit Mixer Trucks: 2 trucks
Full Loads: 1 × 6.0 m³
Last (Partial) Load: 3.27 m³
Pour Method: Direct Chute
Estimated Pour Time: 40 min (~0.7 hr)
Not sure how long to cure this pour before loading it? Concrete Curing Guide →
Unsure which grade fits this element? Concrete Grades M5 to M40 Guide →
Ready-Mix Concrete Order Visualization
What Is a Ready-Mix Concrete Order Calculator?
Ready-mix (RMC) concrete is batched at a plant and delivered by transit mixer truck, ready to place — the question it raises isn't "how much cement, sand, and aggregate do I need" (that's a site-mix question), it's "how many truck loads do I book, how long will the pour take, and what will it cost." Getting the order volume wrong means either an emergency top-up truck mid-pour, or paying for concrete you didn't need.
This calculator converts your pour dimensions (or a directly measured volume) plus a wastage allowance into the exact order volume to book, splits that volume into whole transit mixer truck loads including the final partial load, estimates total pour time from truck count and pour method, and totals cost including an optional pump charge and small-load surcharge if your order falls below your supplier's minimum.
What makes this calculator different:
Most concrete calculators on the web compute cement bags, sand, and aggregate from a mix ratio — useful for site-batched concrete, but the wrong tool once you've decided to order ready-mix. This calculator instead treats the order as a logistics problem: volume in, truck loads and schedule out. It explicitly separates the final partial truck load from full loads (since that's what actually shows up on your last delivery docket), flags orders below a supplier's minimum before you get surprised by a surcharge, and estimates pour duration from truck count and placement method — none of which a mix-ratio calculator answers.
Ready-mix concrete order calculation formula
Step 1 - Theoretical Volume
By Dimensions: Volume = Length x Width x Thickness
By Known Volume: entered directly, unit-converted to m³
Step 2 - Order Volume
Step 3 - Truck Loads
Full Loads = floor(Order Volume / Truck Capacity)
Partial Load = Order Volume − (Full Loads x Truck Capacity)
Total Trucks = Full Loads + (1 if Partial Load > 0)
Step 4 - Pour Time and Cost
Estimated Pour Time = Total Trucks x Minutes per Truck (20 chute / 35 pump)
Total Cost = (Order Volume x Rate per m³) + (Order Volume x Pump Rate, if pumped) + Small-Load Surcharge (if below minimum)
Example ready-mix concrete order calculation
This example uses the active calculator inputs above and follows the same four steps from the formula section. Each table shows the value used, the formula applied, and the result produced.
Input Values Used
| Input | Value |
|---|---|
| Length x Width x Thickness | 10 m x 6 m x 150 mm |
| Wastage | 3% |
| Concrete grade | M25 |
| Transit mixer capacity | 6 m³ |
| Supplier minimum order | 3 m³ |
| Pour method | Direct Chute |
Step 1 - Theoretical volume
| Item | Formula | Result |
|---|---|---|
| Theoretical volume | Length x Width x Thickness | 9 m³ (317.8 cft) |
Step 2 - Order volume
| Item | Formula | Result |
|---|---|---|
| Order volume | 9 x (1 + 3%) | 9.27 m³ (12.12 yd³) |
Step 3 - Truck loads
| Item | Formula | Result |
|---|---|---|
| Full loads | floor(9.27 ÷ 6) | 1 |
| Partial (final) load | 9.27 − (1 x 6) | 3.27 m³ |
| Total trucks to order | 1 full + 1 partial | 2 |
Step 4 - Pour time and cost
| Item | Formula | Result |
|---|---|---|
| Estimated pour time | 2 x 20 min | 40 min (~0.7 hr) |
Therefore, for this pour you need approximately 9.27 m³ of M25 concrete, delivered in 2 truck loads, taking roughly 0.7 hours to place.
Essential Checklist+−
Complete these critical checks before approving the work or proceeding to the next construction stage.
✓Order Volume & Grade Confirmation+-
- Order volume calculated from actual as-built dimensions, not design drawings alone
- Wastage allowance of 2-5% applied on top of theoretical volume before ordering
- Concrete grade confirmed against structural drawings or engineer's specification
- Slump/workability requirement communicated to the supplier for the placement method used
- Any required admixtures (retarder, plasticizer, accelerator) communicated at order time
✓Site Access & Scheduling+-
- Truck access route and turning radius confirmed for the transit mixer size ordered
- Ground along the access route and standing area confirmed to bear the loaded truck's weight
- Pour scheduled with truck dispatch intervals matched to your crew's placement rate
- Weather forecast checked for the scheduled pour date and time window
✓Truck & Delivery Verification+-
- Delivery docket/challan checked against the order — grade, volume, batch time
- Elapsed time since batching checked against the maximum allowable before placement
- No water added on site beyond what the supplier's mix design and slump adjustment protocol allows
- Slump test performed on arrival for the first truck and periodically through the pour
- Test cubes (or cylinders) cast and correctly labeled for later strength verification
✓Placement & Compaction+-
- Formwork checked for correct dimensions, alignment, and secure bracing before the first truck arrives
- Reinforcement position, cover, and tying checked and signed off before the first truck arrives
- Vibration applied systematically at correct spacing and duration, not used to move concrete horizontally
- Maximum time between successive truck loads managed to avoid a cold joint within one element
✓Curing & Quality Control+-
- Curing method and materials staged and ready before the pour starts, not sourced afterward
- Minimum curing duration followed per the applicable standard for the grade and exposure
- Test cube results tracked and compared against specified characteristic strength at the correct test age
- Finished surface protected from foot traffic, loading, or formwork removal before adequate strength is reached
Full QC Checklist+−
Verification checklist for ordering and placing ready-mix concrete — covering order volume and grade confirmation, site access and scheduling, truck and delivery verification, placement and compaction, and curing and quality control. Use the Essential Checklist for critical checks before the first truck arrives; expand to Full QC Checklist for complete quality control from order through curing.
✓Order Volume & Grade Confirmation+-
- Order volume calculated from actual as-built dimensions, not design drawings alone
- Wastage allowance of 2-5% applied on top of theoretical volume before ordering
- Concrete grade confirmed against structural drawings or engineer's specification
- Slump/workability requirement communicated to the supplier for the placement method used
- Any required admixtures (retarder, plasticizer, accelerator) communicated at order time
- Order volume checked against the supplier's minimum order quantity
- Truck count and partial (final) load volume confirmed with the supplier before scheduling
✓Site Access & Scheduling+-
- Truck access route and turning radius confirmed for the transit mixer size ordered
- Ground along the access route and standing area confirmed to bear the loaded truck's weight
- Pour scheduled with truck dispatch intervals matched to your crew's placement rate
- Weather forecast checked for the scheduled pour date and time window
- Concrete pump position, boom reach, and line route confirmed before the truck arrives (if pumping)
- Placement crew, vibrators, and finishing tools confirmed ready before the truck is dispatched
✓Truck & Delivery Verification+-
- Delivery docket/challan checked against the order — grade, volume, batch time
- Elapsed time since batching checked against the maximum allowable before placement
- No water added on site beyond what the supplier's mix design and slump adjustment protocol allows
- Slump test performed on arrival for the first truck and periodically through the pour
- Test cubes (or cylinders) cast and correctly labeled for later strength verification
✓Placement & Compaction+-
- Formwork checked for correct dimensions, alignment, and secure bracing before the first truck arrives
- Reinforcement position, cover, and tying checked and signed off before the first truck arrives
- Placement sequence and direction planned to avoid segregation and maintain a level, continuous pour
- Vibration applied systematically at correct spacing and duration, not used to move concrete horizontally
- Maximum time between successive truck loads managed to avoid a cold joint within one element
- Surface finishing (screeding, floating, troweling) timed correctly relative to bleed water and initial set
✓Curing & Quality Control+-
- Curing method and materials staged and ready before the pour starts, not sourced afterward
- Minimum curing duration followed per the applicable standard for the grade and exposure
- Test cube results tracked and compared against specified characteristic strength at the correct test age
- Finished surface protected from foot traffic, loading, or formwork removal before adequate strength is reached
- As-placed record completed — grade, volume, batch times, docket numbers, and test cube results
Ready-mix concrete reference table
| Item | Typical Value |
|---|---|
| Wastage | 2-3% simple pour; up to 5% complex formwork or longer pump line |
| Transit mixer capacity | 4 m³ to 10 m³, depending on region and truck type |
| Supplier minimum order | Commonly 2-6 m³, varies by supplier |
| Unloading time, direct chute | ~20 minutes per truck |
| Unloading time, pumped | ~35 minutes per truck |
| Concrete working time after batching | Commonly 90 minutes to 2 hours — confirm with supplier |
| Minimum curing duration | At least 7 days for standard conditions — confirm against applicable local standard |
| Test cube ages | Commonly 7-day (interim) and 28-day (characteristic strength) tests |
These are general planning figures. Always confirm exact truck capacity, minimum order quantity, and working time with your specific ready-mix supplier before finalizing an order.
Usage
- Converting pour dimensions or a measured volume into the exact order volume to book with a ready-mix supplier.
- Working out how many transit mixer truck loads a large pour needs before scheduling deliveries.
- Checking a small pour against a supplier's minimum order quantity before an unexpected surcharge appears on the invoice.
- Estimating total pour duration for site scheduling, including the difference between direct chute and pumped placement.
- Preparing an early ready-mix cost estimate for budgeting, using the optional cost, pump charge, and surcharge fields.
- Cross-checking a contractor's quoted truck count against an independent estimate before approving an order.
Tips for Ordering Ready-Mix Concrete
Measure actual formed dimensions, not just the design drawing
Formwork and excavation on site commonly differ slightly from the drawing due to construction tolerance — measure the actual formed dimensions before finalizing the order to avoid an under-order.
Confirm the supplier's minimum order and truck capacity before ordering
Truck capacity and minimum order quantity vary by supplier and region — confirm both directly rather than relying on the calculator's default figures, since your actual invoice depends on your specific supplier's fleet and policy.
Schedule truck dispatch intervals to match your placement rate
For a multi-truck pour, request dispatch intervals matched to how fast your crew can place and vibrate each load — too close together causes trucks to queue with concrete aging in the drum; too far apart risks a cold joint.
Have formwork, reinforcement, and equipment ready before dispatching the order
Ready-mix concrete's working time countdown starts at batching, not on arrival — confirm formwork, reinforcement, vibrators, and your placement crew are ready before the truck is dispatched, not after it arrives.
Increase wastage allowance for complex formwork or a long pump line
A straightforward slab pour with easy access needs less wastage allowance than a pour with complex formwork, a long pump line needing priming, or an inexperienced placement crew — adjust upward rather than using the same figure for every pour.
Check the delivery docket on every truck, not just the first
Grade, volume, and batch time can vary between loads on a multi-truck order — check each docket, not only the first truck, and query any load with an elapsed batching time approaching the supplier's stated working time limit.
Common Mistakes
- Ordering the theoretical volume without adding a wastage allowance, leaving the site short mid-pour.
- Not checking the order against the supplier's minimum quantity, then being surprised by a small-load surcharge on the invoice.
- Scheduling all trucks to arrive at once for a multi-truck pour, causing queuing and concrete aging in the drum before it can be placed.
- Adding water on site to make delivered concrete easier to place, which reduces final strength below the specified grade.
- Not confirming grade against the structural drawings, ordering a lower grade than specified for the element.
- Starting the pour before formwork, reinforcement, and placement crew are genuinely ready, wasting the concrete's limited working time after batching.
Limitations
- This calculator does not design a concrete mix — cement content, water-cement ratio, and admixture dosing are the ready-mix supplier's responsibility, not something this tool computes.
- It does not verify structural adequacy of the specified grade for a given element — confirm grade against structural drawings or an engineer's specification.
- Truck capacity, minimum order quantity, and per-truck unloading time are general planning figures — always confirm the actual values with your specific supplier.
- Pour time is a planning estimate based on truck count and pour method — actual time depends on your crew's placement and compaction speed too.
- It does not account for irregular pour shapes, sloped pours, curved formwork, embedded voids, or multiple distinct pour elements in one calculation — run the calculator separately for each element, or reduce an irregular shape to an equivalent rectangular volume before entering it.
Disclaimer: This calculator provides approximate results for planning and estimation purposes only. Actual requirements may vary based on site conditions, materials, workmanship, and local building regulations. Always consult a qualified engineer, architect, or construction professional before making final decisions.