Free online concrete mix design calculator — IS 10262:2019, ACI 211.1 and BS 8500 / EN 206.
Design economical concrete mixes from scratch. Enter target grade, exposure condition, cement type and aggregate properties; get water/cement ratio, mix proportions, trial mix correction and a printable mix design report.
Switch between IS, ACI and EN methods and compare proportions for the same target grade — useful for export jobs and site reviews.
OPC 33 / 43 / 53, PPC and PSC each give different w/c ratios. The calculator returns the most economical cement choice for your grade and exposure.
Plug in actual slump and density from a trial batch; the tool re-proportions for the next batch automatically.
Download a stamped mix design report and an Excel sheet engineers can edit on site.
M20–M80 (or 20–80 MPa). Exposure determines minimum cement content and maximum w/c ratio.
Specific gravity, absorption, fineness modulus and moisture content of fine and coarse aggregates.
Step-by-step IS 10262 / ACI 211 / EN 206 calculation: target mean strength, w/c ratio, water content, cement content, aggregate content.
Update with actual slump/density and re-balance; the tool tracks each correction in a history log.
Residential building slabs and beams — moderate exposure, OPC 43.
Tall buildings and bridges where compressive stresses demand silica-fume admixtures.
Coastal jetties and piers — w/c ratio and minimum cement content are governed by chloride exposure.
Lower heat of hydration; the tool adjusts w/c and admixture dose for ambient temperature.
Three engineering cases with the inputs and expected results. Open one to see exactly what to type into the calculator.
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