Redi Mix Calculator

For any concrete project bigger than a few wheelbarrows, ordering ready-mix — concrete batched at a plant and delivered wet in a mixer truck — is usually cheaper and far less labor than mixing bags. But the quote is never just “price per yard times yards.” Short-load fees, delivery charges, truck capacity limits, and partial loads all shape the final bill. The Redi Mix Calculator breaks a delivered-concrete order into its real components so you know exactly what you are paying for.

Enter the cubic yards you need, the mixer truck size, the plant’s per-yard price, and the fee schedule, and the calculator shows how many full truckloads your order fills, what rides on the last partial truck, how many trucks are dispatched, the concrete subtotal, any short-load fee, and the total delivered cost — plus the effective cost per yard, the number that lets you compare quotes honestly.

This guide helps homeowners ordering their first truck, contractors sanity-checking plant quotes, and anyone deciding between bags and delivered concrete. Two worked examples — a small 3-yard order with a short-load fee and a larger 14-yard order across two trucks — show every line of the arithmetic.

What Is Ready-Mix Delivered Concrete?

Ready-mix concrete is concrete proportioned and mixed at a batch plant, then transported to your site in a rotating mixer truck while still plastic and workable. The plant controls the mix design precisely — cement content, water-cement ratio, aggregate gradation, and admixtures — which produces more consistent strength than site-mixed bags. A standard mixer truck carries 8 to 10 cubic yards, and the concrete must be placed within roughly 90 minutes of batching.

Pricing has three layers. The base is the per-yard price for the mix design you choose (higher PSI and specialty mixes cost more). On top of that, plants charge a short-load fee when your order falls below their minimum — commonly 3 to 5 yards — because dispatching a truck for a small load costs nearly as much as a full one. Finally, there are delivery and fuel surcharges, and sometimes waiting-time charges if your crew is not ready when the truck arrives. A simple illustration: 3 yards at 165 dollars per yard is 495 dollars of concrete, but a short-load fee and delivery surcharge can push the real total past 640 dollars.

Why the Full Cost Breakdown Matters

Comparing ready-mix quotes on per-yard price alone is the most common estimating mistake. Plant A quotes 160 dollars per yard with a 150 dollar short-load fee under 4 yards; Plant B quotes 175 per yard with no short-load fee. For a 3-yard order, Plant A costs 630 dollars total while Plant B costs 525 — the “cheaper” per-yard price loses by over a hundred dollars. The effective cost per yard (total divided by yards) is the only fair comparison, and the calculator computes it directly.

Truck capacity matters too. Ordering 14 yards with 9-yard trucks means two trucks dispatched: one full 9-yard load and a 5-yard partial on the second. That partial load may trigger a short-load fee at some plants, or the plant may simply roll it as a second delivery charge. Knowing the truck math before you call lets you ask the right questions — and sometimes adjust the order, for example by rounding a 3.5-yard order up to the 4-yard minimum to dodge the short-load fee entirely.

How to Use the Redi Mix Calculator

Step 1: Enter the Concrete Needed in cubic yards, for example 8.5. Compute this from your slab or footing dimensions first. Step 2: Select the Truck Capacity — 8, 9, or 10 cubic yards — based on what your local plant runs; 9 is the standard default. Step 3: Enter the Price Per Cubic Yard from the plant’s quote, for example 165. Step 4: Enter the Short-Load Threshold in cubic yards, for example 4 — orders below this trigger the fee. Step 5: Enter the Short-Load Fee in dollars, for example 85. Step 6: Enter the Delivery / Fuel Fee in dollars, for example 60. Step 7: Click Calculate for the truck breakdown, fees, and total. Click Reset to start over.

Worked Example 1: A 3-Yard Order With a Short-Load Fee

You need 3 cubic yards for a small foundation. The plant charges 165 dollars per yard, applies an 85 dollar short-load fee under 4 yards, and adds a 60 dollar delivery fee. Trucks hold 9 yards.

Step 1: Full truckloads = floor(3 / 9) = 0, with a remainder of 3.0 yards on one partial truck — so 1 truck is dispatched. Step 2: Concrete subtotal = 3 x 165 = $495.00. Step 3: Because 3 yards is below the 4-yard threshold, the short-load fee applies: $85.00. Step 4: Add delivery: total = 495 + 85 + 60 = $640.00. Step 5: Effective cost per yard = 640 / 3 = $213.33 per yard — nearly 30 percent above the quoted 165. This example shows why small orders deserve a bags-versus-truck comparison: 3 yards is 135 eighty-pound bags, which at 5.98 dollars each costs about $807 before tax — so the truck still wins, but not by the margin the per-yard price suggests.

Worked Example 2: A 14-Yard Order Across Two Trucks

You need 14 cubic yards for a driveway. The plant charges 155 dollars per yard, the short-load threshold is 4 yards with a 90 dollar fee, and delivery is 75 dollars. Trucks hold 9 yards.

Step 1: Full truckloads = floor(14 / 9) = 1, remainder = 14 – 9 = 5.0 yards on the second truck — 2 trucks dispatched. Step 2: Subtotal = 14 x 155 = $2,170.00. Step 3: The 14-yard order is above the threshold, so no short-load fee applies. Step 4: Total = 2,170 + 0 + 75 = $2,245.00. Step 5: Effective cost per yard = 2,245 / 14 = $160.36 per yard. Notice the second truck carries only 5 yards — ask the plant whether the partial load incurs any extra charge, and schedule the crew so the first truck is fully placed before the second arrives.

Understanding Truck Logistics and Timing

A mixer truck is a rolling deadline. From the moment water hits cement at the plant, you have about 90 minutes — less in hot weather — before the concrete becomes unplaceable. The plant schedules trucks so each arrives as the previous one finishes discharging, typically 20 to 30 minutes apart for a residential crew. If your crew falls behind, the plant charges waiting time, often 1 to 2 dollars per minute after a grace period, which the calculator does not include — another reason to have forms, reinforcement, and labor ready before the first truck rolls.

Access is the other half of logistics. A loaded mixer truck weighs over 60,000 lb and needs firm, level ground; soft lawns, steep driveways, and low power lines can all force a pump truck or buggy hire, adding hundreds of dollars. Discuss access with the plant dispatcher when ordering, not when the truck is stuck. For tight sites, some plants offer smaller 4 to 6 yard “short” trucks or volumetric mobile mixers that batch on site.

Key Factors That Change the Delivered Price

Mix design is the first price lever. A standard 3,000 PSI residential mix is the baseline; stepping up to 4,000 PSI, adding fiber reinforcement, or ordering specialty mixes like exposed aggregate or colored concrete each add dollars per yard. Admixtures — water reducers, retarders for hot weather, accelerators for cold — are usually priced per yard as well. Know which your project actually needs before requesting the quote.

Distance and minimums form the second lever. Plants define a free-delivery radius; beyond it, mileage surcharges apply per truck. Minimum-load policies vary widely — some plants waive the short-load fee if you accept the truck’s remaining capacity as extra concrete, which is worth considering if your forms can take it. Seasonal demand matters too: spring construction rush can tighten scheduling and firm up prices, while winter work may add cold-weather protection charges.

Tips for Ordering Ready-Mix Concrete

1. Compute your yardage from dimensions first, then add 5 to 10 percent waste before calling the plant.
2. Ask every plant for the same breakdown: per-yard price, short-load threshold and fee, delivery surcharge, and waiting-time rate.
3. Compare quotes on effective cost per yard — total divided by yards — not on the headline per-yard price.
4. If your order sits just under the short-load threshold, price rounding up to the threshold; the extra concrete is often cheaper than the fee.
5. Confirm truck size and site access with the dispatcher a day before delivery.
6. Have forms, rebar, and labor fully ready before the first truck arrives to avoid waiting-time charges.
7. Order admixtures you need (retarder in heat, accelerator in cold) when placing the order, not at the curb.
8. Keep the plant’s phone number handy on pour day in case you need to cancel or add a truck.
9. For very small orders under 2 yards, seriously compare bagged concrete or a volumetric mobile mixer.

Frequently Asked Questions

1. How many cubic yards does a concrete truck hold?

A standard mixer truck carries 8 to 10 cubic yards, with 9 being the most common capacity. Smaller plants and tight-access sites may use 4 to 6 yard trucks. Always confirm the truck size with your plant, since it determines how many trucks your order requires.

2. What is a short-load fee?

A short-load fee is a surcharge — typically 50 to 150 dollars — applied when your order falls below the plant’s minimum, often 3 to 5 yards. It compensates the plant for dispatching a truck that is mostly empty. Some plants waive it if you take a full minimum load.

3. How do I convert cubic feet to cubic yards for an order?

Divide cubic feet by 27. For example, a slab needing 108 cubic feet requires exactly 4 cubic yards. Plants sell by the cubic yard and usually round up to the nearest quarter or half yard, so compute precisely and add your waste allowance before ordering.

4. Is delivered ready-mix cheaper than bags?

Almost always for orders above 1 to 2 cubic yards. Bagged concrete typically costs the equivalent of 250 to 350 dollars per cubic yard, while delivered ready-mix runs 140 to 200 dollars per yard plus fees. Below about a yard, bags win on convenience and total cost.

5. How much time do I have to place the concrete?

Roughly 90 minutes from batching under normal conditions, less in hot weather. The truck’s drum keeps the mix agitated during transit, but the clock is always running. Have everything ready before the truck arrives.

6. What happens if I order too much concrete?

You pay for what was batched. Some plants credit unreturned concrete or charge a restocking/washout fee; others charge the full order. It is far better to slightly over-order (5 to 10 percent waste) than to run short, since a second small delivery triggers another round of fees.

7. Can the truck reach my backyard?

Maybe not directly. A loaded mixer needs about 10 to 12 feet of width and firm ground. For inaccessible sites, options include a concrete pump truck, power buggies, or wheelbarrows — each adding cost. Discuss access with the dispatcher when you order.

8. What PSI mix should I order?

For residential flatwork like patios and walkways, 3,000 to 3,500 PSI is standard. Driveways and structural footings typically use 4,000 PSI. Higher PSI costs more per yard, so match the mix to the application rather than defaulting to the strongest available.

9. Do I need to tip the concrete truck driver?

Tipping is not expected or required. What drivers appreciate is a ready site, clear access, and cold water on a hot day. A smooth, fast discharge earns you goodwill for the next order far better than cash does.

10. What is a volumetric mobile mixer?

A volumetric mixer is a truck that carries dry ingredients and mixes concrete on site to your exact quantity — you pay only for what is discharged, with no short-load fee. It is ideal for small or uncertain quantities, though per-yard prices run higher than plant-batched concrete.

11. How far in advance should I schedule delivery?

Two to three days is typical in normal seasons; a week or more during the spring rush. Large or specialty orders may need longer lead times. Always confirm the day before, and have a rain-date plan since plants will not pour in heavy rain.

12. Why does the plant ask about my mix design?

The mix design — PSI, aggregate size, slump, admixtures — determines both price and performance. The plant needs it to batch correctly and quote accurately. If you are unsure, describe the application and ask the plant or your contractor to recommend the standard local mix.

13. What is slump and why does it matter?

Slump measures concrete workability in inches — how much a cone of fresh concrete settles. A 4-inch slump is standard for slabs; higher slump flows easier but indicates more water, which weakens concrete. Never let the driver add water beyond the ordered slump without understanding the strength tradeoff.

14. Are there extra charges I might be missing?

Common extras include fuel surcharges, waiting time, pump truck hire, Saturday delivery premiums, cold-weather protection, and washout fees. Ask the plant for an all-in total, not just the per-yard price, and use the calculator to verify the effective per-yard cost.

15. Can I cancel or change a concrete order?

Usually yes, with notice — most plants ask for cancellation at least a few hours ahead, sometimes the prior afternoon. Late cancellations after batching may incur a partial charge since the concrete cannot be unmixed. Keep the dispatch number handy on pour day.

CONCLUSION

The Redi Mix Calculator turns a plant quote into a transparent budget: truckloads and partial loads from your yardage and truck size, the concrete subtotal from the per-yard price, short-load and delivery fees applied exactly where they belong, and the effective cost per yard for honest comparison. The worked examples show the two archetypal orders — a 3-yard job where fees add nearly 30 percent, and a 14-yard job where scale brings the effective price down.

The single most important takeaway is this: never compare concrete quotes on per-yard price alone. Fees and minimums decide small orders, truck logistics decide large ones, and the effective cost per yard decides everything. Run every quote through the full breakdown before you schedule the pour.