Concrete Mix Ratio Calculator

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Concrete Mix Ratio Calculator

Calculate the quantities of cement, sand, and coarse aggregate required for a given concrete mix ratio and volume.

Total Concrete Volume (m³)

Mix Ratio Preset

Custom M25 — 1:1:2 M20 — 1:1.5:3 M15 — 1:2:4 M10 — 1:3:6 M7.5 — 1:4:8

Cement Ratio (parts)

Sand Ratio (parts)

Aggregate Ratio (parts)

Wastage Factor (%)

Cement Bulk Density (kg/m³)

Sand Bulk Density (kg/m³)

Aggregate Bulk Density (kg/m³)

Calculate

function conApplyPreset() { const preset = document.getElementById('con-mix-preset').value; if (preset === 'custom') return; const parts = preset.split(':'); document.getElementById('con-cement-ratio').value = parts[0]; document.getElementById('con-sand-ratio').value = parts[1]; document.getElementById('con-agg-ratio').value = parts[2]; }

function conCalc() { const resultDiv = document.getElementById('con-result');

const volume = parseFloat(document.getElementById('con-volume').value); const cRatio = parseFloat(document.getElementById('con-cement-ratio').value); const sRatio = parseFloat(document.getElementById('con-sand-ratio').value); const aRatio = parseFloat(document.getElementById('con-agg-ratio').value); const wastage = parseFloat(document.getElementById('con-wastage').value); const cementDensity = parseFloat(document.getElementById('con-cement-density').value); const sandDensity = parseFloat(document.getElementById('con-sand-density').value); const aggDensity = parseFloat(document.getElementById('con-agg-density').value);

// --- Validation --- if (isNaN(volume) || volume ⚠ Please enter a valid positive concrete volume.'; return; } if (isNaN(cRatio) || cRatio ⚠ All mix ratio parts must be positive numbers.'; return; } if (isNaN(wastage) || wastage 50) { resultDiv.innerHTML = '⚠ Wastage must be between 0% and 50%.'; return; } if (isNaN(cementDensity) || cementDensity ⚠ All bulk densities must be positive values.'; return; }

/ * FORMULA * ------- * Dry volume of concrete ≈ wet volume × 1.54 * (accounts for voids and compaction; standard industry factor) * * Total ratio parts = C + S + A * * Volume of each material (dry) = * (ratio_part / total_parts) × dry_volume × (1 + wastage/100) * * Mass of each material = * volume_of_material × bulk_density * * Cement bags (50 kg each) = cement_mass / 50 /

const DRY_FACTOR = 1.54; const wasteFactor = 1 + wastage / 100; const totalParts = cRatio + sRatio + aRatio; const dryVolume = volume * DRY_FACTOR;

// Volumes (m³) const cVol = (cRatio / totalParts) * dryVolume * wasteFactor; const sVol = (sRatio / totalParts) * dryVolume * wasteFactor; const aVol = (aRatio / totalParts) * dryVolume * wasteFactor;

// Masses (kg) const cMass = cVol * cementDensity; const sMass = sVol * sandDensity; const aMass = aVol * aggDensity;

// Cement bags (50 kg standard) const cBags = cMass / 50;

// Water-cement ratio guidance (typical 0.45–0.55 for M15–M25) const wcRatio = 0.50; const waterLitres = cMass * wcRatio;

resultDiv.innerHTML = ` ### Results

Material Volume (m³) Mass (kg)

🏗 Cement ${cVol.toFixed(4)} ${cMass.toFixed(2)}

🟡 Sand (Fine Aggregate) ${sVol.toFixed(4)} ${sMass.toFixed(2)}

🪨 Coarse Aggregate ${aVol.toFixed(4)} ${aMass.toFixed(2)}

Mix Ratio: ${cRatio} : ${sRatio} : ${aRatio}  |  Wet Volume: ${volume.toFixed(3)} m³  |  Dry Volume: ${dryVolume.toFixed(3)} m³

🛍 Cement Bags Required (50 kg each): ${cBags.toFixed(2)} bags  → round up to ${Math.ceil(cBags)} bags

💧 Estimated Water (w/c = 0.50): ${waterLitres.toFixed(1)} litres (adjust based on aggregate moisture content)

`; }

#### Formula

Dry Volume = Wet Volume × 1.54

The factor 1.54 accounts for the reduction in volume when dry materials are mixed with water (voids fill, particles compact). This is the standard industry multiplier.

Volume of each material = (Ratio Part / Total Parts) × Dry Volume × (1 + Wastage%/100)

Mass of each material = Volume × Bulk Density

Cement Bags = Cement Mass (kg) / 50

Water = Cement Mass × Water-Cement Ratio (default 0.50)

#### Assumptions & References

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References

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