Estimate cement, sand, aggregate, and whole cement bags from a user-defined wet volume, dry-volume factor, and mix ratio. Ratios are planning inputs—not structural recommendations.
Calculate the finished wet volume, add one project allowance, apply an editable dry-volume factor, then divide dry material among user-entered ratio parts.
Cement bags are calculated from an entered cement volume per bag or from bag mass and a user-entered cement bulk density.
planning wet volume = base wet volume × (1 + extra rate)dry volume = planning wet volume × user-entered dry-volume factorcomponent volume = dry volume × component ratio part ÷ total ratio partscement volume per bag = bag mass ÷ user-entered bulk densitybags to buy = ceil(cement volume ÷ cement volume per bag)For 1 m³ wet volume, no extra, a 1.54 dry factor, and a 1:2:4 example ratio: dry volume is 1.54 m³, cement is 0.22 m³, sand is 0.44 m³, and aggregate is 0.88 m³.
With 10% extra, 1 m³ becomes 1.1 m³ wet planning volume and 1.694 m³ dry material at a 1.54 factor. Cement in a 1:2:4 ratio is 0.242 m³.
A purely illustrative 0.22 m³ cement requirement with 0.035 m³ per bag needs 6.29 exact bags, so buy 7.
A two-component 1:4 cement:sand mix assigns one-fifth of dry material to cement and four-fifths to sand.
Use a ratio specified for the project. Example presets do not claim suitability or strength.
Void content, grading, moisture, and compaction can change the relationship between wet and loose dry volume.
Bag weight alone cannot determine cement volume. Density mode requires a user-entered bulk density.
Extra is applied to wet volume before dry conversion so all components increase consistently.
Wet volume is the intended finished mix volume. The user-controlled dry factor converts it to loose ingredient volume and is never silently fixed.
Each positive ratio part receives its proportional share of dry material. Three-component and two-component cement:sand mixes are supported generically.
Whole bags use shared purchase rounding. Purchased cement capacity and approximate surplus are reported when a bag volume can be established.
Direct volume per bag is preferred. Density mode converts entered bag mass using the user’s bulk-density assumption; no universal density is supplied.
Component volumes are shown in volume units only. No mass is inferred without density.
This calculator neither designs a mix nor predicts strength, water demand, durability, or structural suitability.
Apply your dry factor to planned wet volume, then multiply by the cement share of your entered ratio.
Convert wet volume to dry material volume and divide it according to the project mix ratio.
Add seven total parts, then allocate one-seventh to cement, two-sevenths to sand, and four-sevenths to aggregate.
It represents one ratio part cement, two parts sand, and four parts aggregate by the chosen volume basis.
It is a user-entered planning multiplier relating finished wet volume to loose dry ingredients.
Loose ingredients contain voids and consolidate when mixed, but the exact relationship varies.
Divide required cement volume by entered volume per bag and round upward.
Not alone. A user-entered bulk density is also required.
Use two-component mode and enter the specified cement:sand ratio.
Choose a project allowance appropriate to measurement and handling uncertainty.
No. Water-cement ratio and mixing water depend on the mix design or product specification.
No. Nominal ratio inputs are not converted into PSI or MPa claims.
No. Ratios are user-controlled; displayed presets are examples only.