What standard does this concrete mix design calculator follow?

It follows the ACI 211.1-91 standard using the absolute-volume method for normal-weight concrete.

What is the typical range for the water-cement (w/c) ratio?

The typical range is between 0.35 and 0.65, depending on the target strength and exposure conditions.

How is the volume of coarse aggregate determined?

It is determined based on the nominal maximum size of the aggregate and the fineness modulus of the sand using standard ACI 211.1 table values.

Does this tool account for aggregate moisture corrections?

No, this tool calculates the mix design based on dry aggregate weights as per standard ACI absolute-volume calculations.

What is the fineness modulus of sand?

It is an index representing the average size of the fine aggregate particles, typically ranging from 2.40 to 3.00 for concrete mixes.

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Concrete Mix Design (ACI 211)

Design a normal-weight concrete mix per ACI 211.1-91 absolute-volume method. Inputs: slump, nominal max aggregate size, air entrainment, water-cement ratio w/c, fineness modulus of sand, and dry-rodded coarse-aggregate density. Outputs the per-cubic-meter masses of cement, water, fine and coarse aggregate plus the mass ratio.

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2 examples

Non-entrained, w/c=0.45, slump 75-100, max 19 mm, FM=2.70

ACI 211 lookups: W = 205 kg/m³, air ≈ 2.0%, V_ca = 0.63. Per 1 m³: cement 455.6 kg, water 205 kg, coarse aggregate 1008 kg, sand ≈ 663 kg. Mass ratio ≈ 1 : 0.45 : 1.45 : 2.21.

{"result":"ACI 211.1-91 mix design (non-entrained, max 19 mm, slump 75-100). Water W=205 kg/m³, air=2.0%, w/c=0.45 → cement=455.56 kg/m³. Coarse agg V_ca=0.63 → 1008.00 kg/m³. Sand (absolute volume) = 662.50 kg/m³. Mass ratio C:W:S:CA = 1 : 0.45 : 1.45 : 2.21.","metadata":{"input":{"slump":"75-100","maxSize":"19","air":"non-entrained","wcRatio":0.45,"finenessModulus":2.7,"caDensity":1600},"result":{"water":205,"cement":455.56,"sand":662.5,"coarseAgg":1008,"airContent":2,"waterCementRatio":0.45,"caVolumeFraction":0.63,"massRatio":{"cement":1,"water":0.45,"sand":1.45,"coarseAgg":2.21},"unit":"kg/m³"}}}

Entrained, w/c=0.50, slump 25-50, max 25 mm, FM=2.60

ACI 211 lookups: W = 160 kg/m³, air ≈ 4.5%, V_ca = 0.69. Per 1 m³: cement 320 kg, water 160 kg, coarse aggregate 1104 kg, sand ≈ 734 kg.

{"result":"ACI 211.1-91 mix design (entrained, max 25 mm, slump 25-50). Water W=160 kg/m³, air=4.5%, w/c=0.5 → cement=320.00 kg/m³. Coarse agg V_ca=0.69 → 1104.00 kg/m³. Sand = 733.54 kg/m³. Mass ratio C:W:S:CA = 1 : 0.50 : 2.29 : 3.45.","metadata":{"input":{"slump":"25-50","maxSize":"25","air":"entrained","wcRatio":0.5,"finenessModulus":2.6,"caDensity":1600},"result":{"water":160,"cement":320,"sand":733.54,"coarseAgg":1104,"airContent":4.5,"waterCementRatio":0.5,"caVolumeFraction":0.69,"massRatio":{"cement":1,"water":0.5,"sand":2.29,"coarseAgg":3.45},"unit":"kg/m³"}}}

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7 options

SettingsAdjust formats, ranges, numbers, and modes.7

Slump (mm)selectOptionalNominal Max Aggregate Size (mm)selectOptionalAir EntrainmentselectOptionalWater-Cement Ratio w/cnumberRequiredMass ratio of water to cement. Typical range 0.35–0.65.Fineness Modulus of SandnumberRequiredFineness modulus of the fine aggregate. ACI reference range 2.40–3.00.Coarse Aggregate Dry-Rodded Density (kg/m³)numberOptionalDry-rodded unit weight of the coarse aggregate. Default 1600 kg/m³.Decimal PlacesnumberOptional

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Concrete Mix Design (ACI 211)

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1. Non-Entrained Concrete Mix Design

2. Entrained Air Mix for Freeze-Thaw Exposure

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