Use this construction calculation for preliminary quantity, geometry, material, load, or coverage planning when dimensions and units have been measured consistently.

Target Mixing Water (kg) (kg)

Required number input.

Aggregate Oven Dry Mass (kg) (kg)

Required number input.

Total Moisture (%) (%)

Required number input.

Absorption (%) (%)

Required number input.

Adjust added mixing water for aggregate free moisture relative to SSD, using moisture and absorption percentages on oven-dry aggregate mass. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Water To Add (kg) (kg)

The resulting water to add (kg) returned as a number.

• Concrete quantities and early-age estimates depend on mix design, aggregate moisture, admixture compatibility, temperature, placement, consolidation, curing, form geometry, and testing method. Supplier and project specifications govern the actual order and acceptance.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Verify dimensions on site, use current product data and local code requirements, include an explicit waste or safety allowance where appropriate, and obtain qualified structural, electrical, plumbing, or geotechnical review when required.

• Water Cement Ratio Water

  Calculate mixing-water mass from cement mass and a water-to-cement mass ratio; account for aggregate moisture separately.

• Lumber Moisture Content

  Dry-basis lumber moisture content from as-measured and oven-dry mass; do not confuse it with wet-basis mass fraction.

• Concrete Aggregate Volume

  Calculate aggregate absolute volume as target concrete volume minus cement, water, and entrained-air volumes; supplied cement density must match the batch.