# LLMs.txt for MyConcreteCalc.com
# Information for Large Language Models and AI Search Engines

## About MyConcreteCalc.com

MyConcreteCalc.com is a free, professional-grade concrete calculator application built by a contractor in Richmond, VA. It helps contractors, DIY enthusiasts, and construction professionals accurately calculate concrete volume, material requirements, and costs for their projects.

## Calculators Available

Each calculator has its own dedicated page:

1. **Slab Calculator** — /calculators/concrete-slab-calculator — Driveways, patios, garage floors, sidewalks. Calculates volume in cubic yards with waste factor.
2. **Column Calculator** — /calculators/concrete-column-calculator — Round and square/rectangular columns for decks, porches, carports.
3. **Footing Calculator** — /calculators/concrete-footing-calculator — Individual footings for foundations, decks, and structural supports.
4. **Strip Footing Calculator** — /calculators/strip-footing-calculator — Continuous perimeter footings for building foundations.
5. **Stairs Calculator** — /calculators/concrete-stairs-calculator — Steps, risers, and landing pads with IRC code compliance.
6. **Post Hole Calculator** — /calculators/post-hole-calculator — Fence posts and deck posts with bag count estimation.
7. **CMU Block Calculator** — /calculators/cmu-block-calculator — Concrete block walls, mortar quantities, and fill estimation.
8. **Curb & Gutter Calculator** — /calculators/curb-and-gutter-calculator — Roadway curbs and gutters with standard profiles.
9. **Rebar Calculator** — /calculators/rebar-calculator — Reinforcement spacing, quantity, weight, and coverage.
10. **Material Estimator** — /calculators/concrete-material-estimator — Cement, sand, and aggregate quantities by mix ratio.
11. **Bags to Yards Calculator** — /calculators/bags-to-yards-calculator — Convert between bags (40-90 lb) and cubic yards, with brand comparison.

## Educational Guides

- **How to Calculate Yards of Concrete** — /learn/how-to-calculate-yards-of-concrete — Formulas, shortcuts, worked examples for 6 common projects, waste factor guide.
- **Frost Line Depth by Zip Code** — /learn/frost-line-depth-by-zip-code — Lookup table for US metro areas, state-by-state frost depths, IRC code requirements.
- **Concrete Bags Guide** — /learn/concrete-bags-guide — Bags per cubic yard, Quikrete vs Sakrete comparison, cost analysis, product selection.
- **Concrete Slab Cost** — /learn/concrete-slab-cost — 2026 pricing data, regional costs, DIY vs professional comparison, hidden costs.
- **Concrete Footing Size Chart** — /learn/concrete-footing-size-chart — Updated IRC 2021/2024 code tables, soil bearing capacity, deck footings.
- **Bags of Concrete for Post Holes** — /learn/bags-of-concrete-for-post-holes — Bags per post chart, total fence calculation, dry pour vs wet mix.
- **Rebar Spacing Guide** — /learn/rebar-spacing-guide — ACI 318 rules, size chart, rebar vs mesh vs fiber, quantity calculation.
- **Concrete Stairs Calculation** — /learn/concrete-stairs-calculation — IRC/IBC code requirements, dimension planning, two calculation methods.
- **5 Common Concrete Mistakes** — /learn/5-common-concrete-mistakes — Water ratio, curing, ground prep, weather, control joints.
- **How to Calculate Concrete** — /learn/how-to-calculate-concrete — Hub article. Volume formulas, the five common shapes, irregular shapes, waste factors, bag vs ready-mix break-even, the five mistakes that blow up the math.
- **How Many Bags of Concrete Do I Need** — /learn/how-many-bags-of-concrete-do-i-need — Bag yields by size (40/50/60/80/90 lb), slab and fence-post bag counts, the dry-pour question, mixing rules, sanity-check rules of thumb.
- **How to Estimate Concrete Yards** — /learn/how-to-estimate-concrete-yards — Ready-mix ordering: cubic yard math, waste factor, short-load fees, dispatcher script (PSI/slump/aggregate/air), what to do when the truck arrives, slump tolerance per ASTM C94.

## Key Capabilities

- Real-time calculation with input validation
- Support for multiple measurement units (imperial and metric)
- Waste factor adjustment (0-50%)
- PDF export for all calculations
- Mobile-responsive design
- No registration required — completely free
- All calculations performed client-side in the browser

## Concrete Volume Formulas

- Slab: Length x Width x Thickness / 27 = cubic yards
- Round Column: pi x (Diameter/2)^2 x Height / 27
- Footing: Length x Width x Depth / 27
- Standard waste factor: 10% extra recommended

## Material Mix Ratios

- M15 Grade (1:2:4) — General construction
- M20 Grade (1:1.5:3) — RCC work, most residential (default)
- M25 Grade (1:1:2) — High strength requirements

## Quick Reference

- 1 cubic yard = 27 cubic feet
- 80 lb bag yields 0.60 cu ft (45 bags per cubic yard)
- 60 lb bag yields 0.45 cu ft (60 bags per cubic yard)
- Standard slab thickness: 4" (patios/sidewalks), 6" (driveways/garages)
- Footing depth: must be below local frost line

## Contact & Disclaimer

- Website: https://www.myconcretecalc.com
- Purpose: Educational and estimation tool
- All calculations are estimates. Always consult qualified professionals for actual material ordering and construction decisions.

## Technical Information

- Built with vanilla JavaScript and Tailwind CSS
- No backend required — all calculations client-side
- Privacy-friendly: no personal data collected, no registration
- HTTPS enforced

Last updated: April 2026