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`Wall = f( L , H , W , 18 , 3 , 1 , 8 )`

Enter a value for all fields

The **Wall - Rebar, Concrete and Forms** calculator computes the length or weight * CONCRETE WALL*

**INSTRUCTIONS:** Choose length units (e.g. feet or meters) and enter the following:

- (
**L**) This is the length of the wall. - (
**H**) This is the height of the wall. - (
**W**) This is the width or thickness of the wall. - (
**rS**) This is the rebar size. - (
**oC**) This is the rebar on-center spacing. (Default 18") - (
**i**) This is the rebar inset from the edges (Default 3") - (
**M**) This is the number of mats (grids)

.

**Concrete Wall Materials:** The calculator returns the rebar **Length** in feet, the rebar **Weight** in pounds, the **Volume** of concrete in cubic yards, and the **Surface Area** of the forms in square feet. However, all of these can be automatically converted to other units (e.g. feet to meters, pounds to kilograms, cubic yards to cubic meters, square feet to square meters) via the pull-down menu.

**Rebar and Concrete in a Slab:**The calculator returns all of the following:**Total Length**of rebar in feet**Total Weight**of rebar in pounds**Total Volume**of concrete in cubic yards. Note: this accounts for the concrete displaced by rebar.**Total Weight of Slab**in pounds. Note: this includes the weight of rebar and concrete.

- 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
- Compute the
**Total Weight of a Slab with Rebar** - Spanish Version:
**Calculadora de Barras de Refuerzo**

**Note:** The lapping portion of the rebar length calculation assumes that the uncut rebar on site is 40' (feet) in length and that lapping is not necessary under that length. Furthermore, this calculator assumes that rebar is lapped by a factor of 40 times the diameter of the rebar chosen. For the same calculations with the ability to add a different "uncut" length and/or a different lapping factor CLICK HERE.. The calculation determines the need for an extra rebar using an internal tolerance for for a spacing fraction that exceeds the tolerance with a default of 1". It also assumes that the uncut rebar is in 40' lengths and that lapping is needed for dimensions in excess of 40`. Furthermore, the lapping factor, when lapping is needed, is 40. For the same calculations with the ability to add a different "uncut" length and/or a different lapping factor CLICK HERE.

* Rebar Specifications *

When the dimensions of your slab or wall exceed the length of a single piece of rebar, it is required to lap and tie the rebar to create the added length. There are a few considerations. First, the length of the lap is often specified as 40 times the diameter of the rebar. In this case, 40 is lapping factor. 60 is also a common factor, but the engineering specifications should always be applied. See these YouTube videos to better understand rebar lap:

Second, the typical length of pre-cut rebar is 40' and 60' in the United States.

- Total Slab Weight - This includes the weight of the rebar and the concrete.
- Brick or Block Wall - Number of brick or block needed for a wall.
- Foundation - Poured - Amount of concrete needed for a poured foundation.
- Foundation - Block - Number of blocks needed for a foundation.