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`Wtr = "V" * CWR`

Enter a value for all fields

The **Water Needed for Concrete** formula computes the volume of water needed for a volume (**V**) of concrete.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**V**) Volume of concrete

**Water for Concrete (Wtr):** The calculator returns the volume of water in gallons. However, this can be automatically converted to compatible units via the pull-down menu.

Concrete mix requires about 3.5 quarts per 80 lb bag (0.6 cubic feet). That's a volume ratio of 0.194950810185185 real

The formula for Water needed for Concrete is:

Wtr = V*CWR

where

- Wtr = Volume of Water
- V = Volume of Concrete
- CWR = Concrete to Water Ratio (0.194950810185185 real)

**Rebar Calculator**(Spanish Version:**Calculadora de Barras de Refuerzo**)**Weight of Any Volume of Concrete****Rebar and Concrete Volume and Weight in a Slab****Rebar Weight****Length of Rebar**needed for a slab.**Weight of Rebar**in a slab.**Weight, Volume of Concrete and Surface Area of a Concrete Slab****Surface Area**of a slab**Surface Area of Concrete Forms**.**Volume of Concrete**in a slab.**Water Needed for Concrete****Rebar and Concrete in a Slab****Length of Rebar in Grid****Weight of Rebar in Grid****Rebar in a Wall****Rebar in an Irregular Shaped Slab****Rebar in a Circular Slab****Rebar Lapping Length****Rebar Cost Estimate****Weight of Length of Rebar****Concrete Displaced by Rebar****Total Weight of a Slab with Rebar**

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