# Quantity Takeoff Calculator

> Construction quantity takeoff skill for concrete, steel, earthwork, and materials

- Skill: `a5c-ai/quantity-takeoff-calculator` (Agent Skill)
- Install (CLI): `npx skillmds@latest add a5c-ai/quantity-takeoff-calculator`
- Raw SKILL.md: https://api.skillmd.com/api/skills/a5c-ai/quantity-takeoff-calculator/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: a5c-ai (https://skillmd.com/u/a5c-ai)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/a5c-ai/quantity-takeoff-calculator

---


# Quantity Takeoff Calculator Skill

## Purpose

The Quantity Takeoff Calculator Skill calculates construction quantities including concrete volumes, steel weights, earthwork quantities, and material takeoffs from drawings or BIM models.

## Capabilities

- Concrete volume calculation
- Steel weight calculation
- Earthwork quantities
- Pipe and conduit lengths
- Area calculations (formwork, finishes)
- Unit conversion
- Waste factor application
- BIM-based takeoff

## Usage Guidelines

### When to Use
- Estimating project quantities
- Supporting cost estimates
- Verifying contractor quantities
- Planning material procurement

### Prerequisites
- Design documents available
- Takeoff categories defined
- Unit system established
- Waste factors identified

### Best Practices
- Use consistent methods
- Document measurement rules
- Apply appropriate waste factors
- Cross-check critical items

## Process Integration

This skill integrates with:
- Construction Cost Estimation
- Specifications Development

## Configuration

```yaml
quantity-takeoff-calculator:
  categories:
    - concrete
    - steel
    - earthwork
    - masonry
    - piping
  sources:
    - bim-model
    - drawings
    - cad
  units:
    - imperial
    - metric
```

## Output Artifacts

- Quantity summaries
- Material takeoffs
- Cost backup data
- BOM reports