TryBuildCalcRMC Order Calculator(Ready-Mix Concrete Ordering)
Use this RMC order calculator to convert your pour volume into the number of transit mixer loads to order, with cost.
Find out how many transit mixer loads your pour needs and avoid an unplanned top-up order or an unexpected small-load surcharge.
Calculate your RMC order quantity.
🕒 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): 12.36 m³
Theoretical Volume: 12.00 m³ (423.8 cft)
Order Volume: 436.5 cft (16.17 yd³)
Concrete Grade: M25
Transit Mixer Trucks: 3 trucks
Full Loads: 2 × 6.0 m³
Last (Partial) Load: 0.36 m³
Pour Method: Direct Chute
Estimated Pour Time: 60 min (~1 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
RMC order quantity and truck scheduling
This page focuses on the ordering side of ready-mix concrete — how many truck loads to book and roughly how long the pour will take, not the mix design itself.
The calculator inputs are pre-filled for this use case so the result card starts with values that match the page topic. You can adjust any input to recalculate the estimate.
- Default pour: 12 m x 8 m slab, 125 mm thick.
- Shows full and partial truck loads separately.
- Estimates total pour time for scheduling.
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 | 12 m x 8 m x 125 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 | 12 m³ (423.8 cft) |
Step 2 - Order volume
| Item | Formula | Result |
|---|---|---|
| Order volume | 12 x (1 + 3%) | 12.36 m³ (16.17 yd³) |
Step 3 - Truck loads
| Item | Formula | Result |
|---|---|---|
| Full loads | floor(12.36 ÷ 6) | 2 |
| Partial (final) load | 12.36 − (2 x 6) | 0.36 m³ |
| Total trucks to order | 2 full + 1 partial | 3 |
Step 4 - Pour time and cost
| Item | Formula | Result |
|---|---|---|
| Estimated pour time | 3 x 20 min | 60 min (~1 hr) |
Therefore, for this pour you need approximately 12.36 m³ of M25 concrete, delivered in 3 truck loads, taking roughly 1 hours to place.
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.
Related Calculators
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.