# Rebar Takeoff Calculator — United States

> Estimate a rectangular reinforcement grid from specified cover, spacing, bar size and layer count. USD planning view; stated limitations apply.

Page: https://askcalculators.com/us/rebar/
Definition: https://askcalculators.com/us/rebar/definition.json
JSON Schema: https://askcalculators.com/us/rebar/schema.json
Version: 20.16.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/us/rebar/?unitSystem=imperial&length=16.404199475065617&width=13.123359580052492&cover=1.968503937007874&spacing=7.874015748031496&diameter=0.4724409448818898&layers=1&stockLength=19.68503937007874&lapAllowance=10&wastePercent=10&unitRate=0&laborCost=0&deliveryCost=0&otherCost=0&costMultiplier=1&spreadPercent=15&taxRate=0

## Inputs
- unitSystem: Measurement system; type=select; optional; default=imperial; values=imperial|metric
- length: Length; type=number; required; default=16.404199475065617; min=0.0032808398950131233; max=3280839895013.123
- width: Width; type=number; required; default=13.123359580052492; min=0.0032808398950131233; max=3280839895013.123
- cover: Specified edge cover; type=number; required; default=1.968503937007874; min=0; max=39.37007874015748
- spacing: Maximum grid spacing; type=number; required; default=7.874015748031496; min=0.03937007874015748; max=39370078740.157486
- diameter: Bar diameter; type=number; required; default=0.4724409448818898; min=0.03937007874015748; max=3.937007874015748
- layers: Grid layers; type=number; required; default=1; min=1; max=10
- stockLength: Stock bar length; type=number; required; default=19.68503937007874; min=0.32808398950131235; max=3280839895013.123
- lapAllowance: Explicit lap/anchorage length allowance; type=percent; required; default=10; min=0; max=200
- wastePercent: Cutting/waste allowance; type=percent; required; default=10; min=0; max=100
- unitRate: Material price per stock bar; type=money; required; default=0; min=0; max=1000000000000
- laborCost: Total labor allowance; type=money; required; default=0; min=0; max=1000000000000
- deliveryCost: Delivery allowance; type=money; required; default=0; min=0; max=1000000000000
- otherCost: Other fixed costs; type=money; required; default=0; min=0; max=1000000000000
- costMultiplier: Material/labor multiplier; type=number; required; default=1; min=0.1; max=10
- spreadPercent: Low/high sensitivity around the entered total; type=percent; required; default=15; min=0; max=100
- taxRate: Explicit tax allowance; type=percent; required; default=0; min=0; max=100

## Outputs
- barsX: Bars parallel to length per layer; format=number
- barsY: Bars parallel to width per layer; format=number
- totalLength: Total bar length including allowances; format=number
- mass: Theoretical steel mass; format=number
- stockBars: Whole stock bars; format=number
- materialCost: Material cost; format=currency
- laborCost: Labor allowance; format=currency
- deliveryCost: Delivery allowance; format=currency
- otherCost: Other specified costs; format=currency
- tax: Entered tax allowance; format=currency
- low: Low cost scenario; format=currency
- mid: Middle cost scenario; format=currency; primary
- high: High cost scenario; format=currency

## Formula
bar count across a clear dimension = ceiling(clear dimension ÷ maximum spacing) + 1.

Inputs are converted to canonical units before evaluating this stated formula.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Illustrative defaults are not local quotes or verified legal rules. Dated reference components and user-entered assumptions are explicitly distinguished. Professional review is pending.