METHOD & TRANSPARENCY

Know what the tool calculates.

Concrete Ratio is an independent educational and preliminary concrete mix proportioning workspace. It makes inputs, assumptions, intermediate equations and trial quantities visible.

Calculation scope

The engine implements the ordinary and standard grade workflow of IS 10262:2019 for normal-weight, non-air-entrained concrete, from M10 through M60. Selected IS 456:2000 durability checks are included. It is not BIS software, a conformity certificate, or a project-approved mix design.

• Target mean strength uses the greater of the statistical and grade-based margins.
• Water estimates, binder quantities, aggregate fractions and moisture corrections use a consistent SI mass and absolute-volume basis.
• The interactive reference graph is an approximate manual redraw of Figure 1. It is not a digital table published by BIS or a measurement of your concrete.
• SCM blends require material-specific ratio inputs; OPC curves are not automatically applied to them.
• Special concrete families and full structural, sulphate, chloride and acceptance checks are outside this implementation.

Graph-driven aggregate design

The Graph design workspace combines sand and stone sieve curves by oven-dry mass. You can drag a target curve, fit a blend share and preview batch quantities before applying it. Example curves are illustrative; user-entered values are not independently verified. The fit minimizes squared differences across the displayed sieves, not concrete cost, packing density or strength.

An applied graph blend replaces the IS table aggregate split. Its dry-mass share is converted using absorption and bulk SSD specific gravity before absolute-volume proportioning. The source sieve values and target are included in exports. No IS 383 grading-envelope conformity is inferred from the graph.

Sources and review

The numerical method was checked against the referenced 2019 and 2000 source texts. Current amendments and project requirements must be verified through the Bureau of Indian Standards before project use. No independent professional certification is claimed.

IS 10262:2019 source copy · IS 456:2000 source copy. These are third-party copies of BIS documents; no full standard is redistributed by this website.

Your inputs

Calculator inputs and observations are held in the current page session. The application does not send them to an application database or an AI service. Reloading the page clears the session. A worksheet export is created in your browser; printed reports use your browser’s print function.

The hosting provider may process ordinary request and access logs. This version does not include third-party analytics or an AdSense script.

Advertising

There are no active ads in this version. Future advertising positions are planned after explanatory content, separate from input controls, graph interactions and export buttons. Activation requires publisher setup and an updated privacy and consent implementation appropriate to the audience.

Checking a result

For reproducible checking, retain the exported worksheet, input values, calculation step number and expected value with its source. Compare the result with independent calculations and material trial results before use.

Image credits

Aggregate photograph: Bill Bradley/Billbeee, CC BY 3.0; cropped for display. Laboratory testing photograph: Xb-70, courtesy of Simpson Gumpertz & Heger, Inc., public domain; cropped for display.

Research and implementation date: 5 September 2026.