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Concrete Mix Cost & Slump Estimator

Know what your
mix actually costs.

Enter your plant's real quantities and delivered prices. This tool returns cost per cubic yard and cubic meter, an absolute-volume yield check, an ACI 211-based screening slump estimate, the ACI 305 surface evaporation rate and a combined aggregate gradation check — in any mix of US and metric units.

Not sure where to start, or what each section does?

  • Any unit system
  • Absolute-volume yield
  • ACI 211 slump screening
  • ACI 305 evaporation rate
  • Tarantula gradation check
  • Pre-quote review checks

Placing conditions

Will the surface dry faster than it bleeds?

The ACI 305 surface evaporation rate: how fast water leaves the top of the pour. Above 1.0 kg/m²/h — the same threshold as the familiar 0.2 lb/ft²/h — plastic shrinkage cracking becomes likely and precautions are required.

In the shade, at the pour
Measured with an infrared thermometer
Degrees, same size as the unit above
Measured about 0.5 m above the surface — a mast or airport reading is higher
%
Evaporation rate
0.00 kg/m²/h
0.000 lb/ft²/h
Normal

Surface temperature —
Dew point —
Vapour pressure deficit —

Sensitivity at this surface temperature — humidity down, wind across

The equation covers temperature, humidity and wind only. It does not include solar radiation, shading, surface texture or any fogging already in place, so on a clear day treat the figure as a floor rather than a ceiling — and judge the real risk on the surface itself: loss of sheen, early crusting, plastic cracking.

Mix settings

Set the basis for the batch

Percent by volume
Percent added to material cost
$ / yd³ — batching, power, overhead
Apply yield correction
Prices per yd³ the batch actually makes, not per yd³ of ingredients
Aggregate moisture
Corrects batch water for wet stockpiles

Design targets

What the mix is meant to hit

Enter the specified targets and the report shows them beside what your proportions actually produce, flagging anything outside tolerance. Design strength is recorded and printed — it is not predicted from the mix.

Recorded only — never predicted

Materials & plant prices

Your mix design, your delivered prices

Quantities and prices can each use whichever unit your plant works in — the tool converts everything internally. Admixtures dosed in fl oz/cwt or mL/100 kg rebase automatically on total cementitious content. Uncheck a row to exclude it without losing the values.

Mix materials, quantities, unit prices and resulting cost per cubic yard
Include Material Category Quantity Qty unit Unit cost Cost unit Sp. gravity $ / yd³ Remove

Cost summary

What a yard costs you

Total concrete cost / yd³ $0.00 $0.00 / m³
Materials, as entered $0.00 $0.00
Yield correction — off $0.00 $0.00
Waste allowance $0.00 $0.00
Other plant cost $0.00 $0.00
Total $0.00 $0.00

Cost contribution

Where the money goes

Each active material's share of as-entered material cost, largest first.

Mix design checks

Does the mix close on volume?

Absolute volumes are computed from mass and specific gravity, plus entrained air. A theoretical yield of 27 ft³ means the batch makes exactly one cubic yard.

Total cementitious 0lb/yd³ 0 kg/m³
Water–cementitious 0.000 0 lb/yd³ water
Theoretical yield 0.00ft³ 27.00 ft³ = one cubic yard
Yield factor 0.000 —
Theoretical unit weight 0.0lb/ft³ 0 kg/m³
Air content 0.0% 0.00 ft³/yd³

Slump estimator

ACI 211-based screening estimate

The estimator reads your batch water against ACI 211's approximate mixing-water demand for the selected aggregate size and air condition, then applies your plant corrections. It is a planning aid, not an acceptance result.

% — positive for angular or harsh grading; lowers slump
% — positive if the paste needs more water; lowers slump
% water reduction at equal workability; raises slump
in — negative for slump loss before testing
in — from your own trial batches
Enter a measured value to get a suggested offset
Estimated slump
0.0 in
0 mm
Screening estimate
Batch water 0 lb/yd³
ACI-equivalent water 0 lb/yd³
Reference 1.5 / 3.5 / 6.5 in — / — / —

Gradation

Is the combined aggregate workable?

The Tarantula Curve, from Cook and Ley at Oklahoma State. Enter percent passing from each aggregate’s sieve report; the blend comes from the batch weights above. Passing is not a guarantee of workability — the developers pair it with the Box Test — but failing it reliably predicts a mix that is hard to place or finish.

ASTM D4791 at 1:3, from the aggregate report

Percent retained on each sieve. The two dark lines are the published upper and lower limits — the envelope the curve is named after — and the orange line is this mix. A filled marker is a sieve outside the envelope.

Checks

Review before this price goes out

These look for the failure modes that produce a plausible-looking but wrong number — a price charged against a quantity the row does not carry, a material taking up no space, a yield nowhere near 27 ft³, a slump estimate that has hit the display limit, gradation data that cannot be physically correct.

Materials library

Your materials, your suppliers

Set a material up once with its source, SSD specific gravity and price, then drop it into any mix instead of retyping. Shared with your colleagues; VeroTouch products are included and priced by us.

Saved mixes

Pick up where you left off

Saved to your company account and shared with your colleagues. VeroTouch cannot see them.

Quality control

Turn your test readings into a report

Enter what you measured on the pour and what the cylinders broke at. The report presents your own readings — it is not a certified test result.

Cylinder break results by age
Age, days Cyl 1 Cyl 2 Cyl 3 Average psi % of design

Report letterhead

Your logo on every report

Reports you generate carry your branding, not ours. PNG or JPG, up to 2 MB.

Your report

Take the numbers with you

Download this mix as a spreadsheet-ready CSV and a full PDF report — every input, every conversion, the cost and slump breakdown, and your quality-control readings.

See our privacy policy.

Method & limits

ACI 318 is a structural design code and contains no slump-prediction equation. This estimator uses ACI 211 proportioning water-demand relationships as its reference, then applies the plant corrections you enter. Predicted slump is a screening figure for planning only — it is never an acceptance result. Verify fresh concrete with the current ASTM C143/C143M procedure. Project specifications, approved mixture submittals, and your quality-control program govern production and acceptance. Costs reflect only the quantities and prices you enter here.

ACI 211 → ACI workability FAQ → ASTM C143/C143M →

What each section does

Short notes on every section, a little fuller than the line inside each card. Nothing here needs to be read in order — work top to bottom and the figures fill in as you go.

Placing conditions

  • Answers one question: will the top of the pour dry faster than water can bleed up to it?
  • Needs only weather — air temperature, humidity, wind. It reads nothing from your mix, so it works before you enter anything else.
  • Above 1.0 kg/m²/h, plan for fogging, windbreaks, an evaporation retarder or an earlier cure.
  • Surface temperature moves the answer more than any other input. If the number will drive a decision, measure it with an infrared gun rather than leaving it to the offset.

Mix settings

  • Sets the basis every later figure is measured against.
  • Yield correction on prices a cubic yard the batch actually makes. Off prices a cubic yard of ingredients. On is what you sell; off is what you buy.
  • Aggregate moisture on adds a batch sheet under the materials table, converting design weights into what the plant actually weighs out.
  • Waste allowance and other plant cost are added after the materials, so you can see them separately in the cost breakdown.

Design targets

  • What the job specified, as opposed to what your proportions produce.
  • The report prints the two side by side and flags anything outside tolerance.
  • Design strength is recorded and printed — it is never predicted from the mix.

Materials & plant prices

  • One row per material. Quantity and price can each use whichever unit your plant works in; the conversions happen underneath.
  • Specific gravity is what makes yield work. A row without one costs money but takes up no space in the batch, and the checks section will say so.
  • Admixtures dosed per hundredweight rebase themselves whenever the cementitious total changes.
  • Untick a row to leave it out of the mix without losing what you typed.

Cost summary

  • What one cubic yard costs you, on the quantities and prices you entered — and the same figure per cubic metre beside it.
  • Materials, plus any waste allowance and other plant cost from Mix settings. Nothing else is in it.
  • This is a cost, not a price. No margin, delivery, pumping or admin — those are yours to add.

Cost contribution

  • Which materials are actually driving the cost per yard.
  • Usually the answer is cement. This is how you find out when it is not.

Mix design checks

  • Yield is whether the batch closes on 27 ft³. More than a couple of percent off usually means a mistyped quantity or a wrong specific gravity, not a real yield problem.
  • Water-cementitious ratio is design water over cementitious — the ratio a specification means. Aggregate moisture never enters it.
  • Unit weight is worth comparing against what you actually weigh on a load.

Slump estimator

  • A screening estimate interpolated from the ACI 211 water-demand tables. It is a planning figure, not an acceptance result.
  • Calibrate it: enter a measured slump from a trial batch and it suggests a plant offset to carry forward.
  • Verify fresh concrete by ASTM C143/C143M. ACI 318 contains no slump-prediction equation at all.

Gradation

  • Checks the combined aggregate against the Tarantula Curve — a workability check, separate from cost and yield.
  • Needs percent passing from each aggregate's sieve report. The blend comes from the batch weights you entered above.
  • A sand plus one coarse size usually lands short on fine sand. That is normal and expected — the fix is an intermediate aggregate, not a different number.
  • Passing is not a guarantee of workability. The people who developed it pair it with the Box Test.

Checks

  • Looks for the ways this tool can produce a plausible-looking but wrong number, before a price goes out on it.
  • Catches a price charged against a quantity the row does not carry, a material with no specific gravity, a yield nowhere near 27 ft³, a slump estimate that hit the display limit.
  • Review means fix it. Note means worth a look, not blocking.

Materials library

  • Set a material up once — supplier, specific gravity, price, gradation — then drop it into any mix instead of retyping it.
  • Shared with colleagues on your company account.
  • VeroTouch's own products are priced by us and locked: you can change the dosage, not the price.

Saved mixes

  • Saved to your company account and shared with your colleagues.
  • VeroTouch cannot see what you save here.

Quality control

  • What you measured on the pour, and what the cylinders broke at.
  • The report presents your own readings and draws the strength-gain curve from them. It is not a certified test result.
  • The tool never predicts strength. Compressive strength is measured, not calculated.

Report letterhead

  • Upload your logo once and every report you generate carries it instead of ours.

Your report

  • Builds a PDF of everything above — download it, or have it emailed to you.
  • Every section prints, with anything you left blank marked as not assessed, so two reports can be read side by side.