A calculation tool for field engineers and researchers. Design and export concrete mix proportions based on ACI, IS, and BS procedures — or your own custom method.
Free · iOS 17+ · iPhone & iPad · Always validate before field use
Features
Designed for engineers who need fast proportioning guidance in the field or lab. Always verify outputs before use.
Proportioning based on ACI 211.1, IS 10262:2019, and BS 8500 procedures. Switch methods instantly. Results should be verified against the original standard before use.
Specify total binder content and W/B ratio directly. Ideal for UHPC, research trials, and proprietary mix designs. Full volume balance check included.
Dual supplementary cementitious materials — Fly Ash, GGBS, Silica Fume. ACI k-value efficiency factors applied for W/CM estimation.
Moisture and absorption corrections for coarse and fine aggregates. Temperature guidance for hot and cold weather concreting per ACI 305R and 306R.
Generate and share mix design summaries with your name, company, and project details. Includes proportions, batch quantities, and field-adjusted values.
Save unlimited designs locally. Search by name or notes. Separate sections for standard and custom designs. Edit and recalculate any saved design.
Switch between Metric (MPa, mm, kg/m³) and Imperial (psi, in, °F) for ACI designs. IS and BS outputs remain in SI units as defined by those standards.
Reference guides for slump test (ASTM C143), air content (ASTM C231), fresh density (ASTM C138), and temperature (ASTM C1064) with tutorial links.
All calculations run on-device. No account required. No data ever leaves your phone. Works anywhere, even without internet.
Screenshots
Clean, intuitive interface that works in both light and dark mode.
Home
Mix Composition
Batch Quantities
Archive
Design Detail
Settings
Field Test Guide
Download slump.IO free on the App Store (Coming soon). No account, no subscription.
Download on App Store (Coming soon)