# CalcShed ## Pages - [Caulk Calculator](https://calcshed.com/caulk-calculator/) - [Box Fill Calculator](https://calcshed.com/box-fill-calculator/) - [Grout Calculator](https://calcshed.com/grout-calculator/) - [Framing Cost Calculator](https://calcshed.com/framing-cost-calculator/) - [Subfloor Cost Calculator](https://calcshed.com/subfloor-cost-calculator/) - [Drywall Cost Calculator](https://calcshed.com/drywall-cost-calculator/) - [Fence Cost Calculator](https://calcshed.com/fence-cost-calculator/) - [Window Replacement Cost Calculator](https://calcshed.com/window-replacement-cost-calculator/) - [Roof Replacement Cost Calculator](https://calcshed.com/roof-replacement-cost-calculator/) - [Home Improvement Costs](https://calcshed.com/home-improvement-costs/) - [Concrete Slab Cost in 2026: Per Sq Ft, Per Yard & by Size](https://calcshed.com/concrete-slab-cost/): A concrete slab costs $6 to $12 per square foot installed in 2026, with a national average near $8 per square foot for a standard 4-inch residential slab. Ready-mix concrete runs $125 to $175 per cubic yard delivered, and a typical 20×20 ft slab (400 sq ft) costs $2,400 to $4,800 poured. Real all-in contractor quotes that include site prep and finishing often land closer to $10-$16 per square foot, and decorative stamped or stained slabs reach $20-$30 per square foot. This guide breaks down what a concrete slab actually costs in 2026 – by square foot, by cubic yard, by […] - [Generator Size Calculator](https://calcshed.com/generator-size-calculator/) - [Retaining Wall Calculator](https://calcshed.com/retaining-wall-calculator/) - [Framing Calculator](https://calcshed.com/framing-calculator/) - [Fence Calculator](https://calcshed.com/fence-calculator/) - [Lumber Calculator](https://calcshed.com/lumber-calculator/) - [Ohms Law Calculator](https://calcshed.com/ohms-law-calculator/) - [Wallpaper Calculator](https://calcshed.com/wallpaper-calculator/) - [Pool Volume Calculator](https://calcshed.com/pool-volume-calculator/) - [Stair Calculator](https://calcshed.com/stair-calculator/) - [Lawn Seed Calculator](https://calcshed.com/lawn-seed-calculator/) - [Paver Calculator](https://calcshed.com/paver-calculator/) - [Stain Calculator](https://calcshed.com/stain-calculator/) - [Drywall Calculator](https://calcshed.com/drywall-calculator/) - [Brick Calculator](https://calcshed.com/brick-calculator/) - [Siding Calculator](https://calcshed.com/siding-calculator/) - [Browse](https://calcshed.com/all-calculators/) - [Cable Tray Fill Calculator](https://calcshed.com/cable-tray-fill-calculator/) - [Breaker Size Calculator](https://calcshed.com/breaker-size-calculator/) - [Watts Amps Volts Calculator](https://calcshed.com/watts-amps-volts-calculator/) - [Electrical Load Calculator](https://calcshed.com/electrical-load-calculator/) - [Voltage Drop Calculator](https://calcshed.com/voltage-drop-calculator/) - [Amp To Wire Size Calculator](https://calcshed.com/amp-to-wire-size-calculator/) - [Wire Size Calculator](https://calcshed.com/wire-size-calculator/) - [Fill Dirt Calculator](https://calcshed.com/fill-dirt-calculator/) - [Tile Calculator](https://calcshed.com/tile-calculator/) - [Flooring Calculator](https://calcshed.com/flooring-calculator/) - [Paint Calculator](https://calcshed.com/paint-calculator/) - [Sod Calculator](https://calcshed.com/sod-calculator/) - [Roof Area Calculator](https://calcshed.com/roof-area-calculator/) - [Roof Truss Calculator](https://calcshed.com/roof-truss-calculator/) - [Metal Roofing Calculator](https://calcshed.com/metal-roofing-calculator/) - [Shingle Calculator](https://calcshed.com/shingle-calculator/) - [Compost Calculator](https://calcshed.com/compost-calculator/) - [Topsoil Calculator](https://calcshed.com/topsoil-calculator/) - [Mulch Calculator](https://calcshed.com/mulch-calculator/) - [River Rock Calculator](https://calcshed.com/river-rock-calculator/) - [Pea Gravel Calculator](https://calcshed.com/pea-gravel-calculator/) - [Sand Calculator](https://calcshed.com/sand-calculator/) - [Gravel Calculator](https://calcshed.com/gravel-calculator/) - [Asphalt Calculator](https://calcshed.com/asphalt-calculator/) - [Roof Pitch Calculator](https://calcshed.com/roof-pitch-calculator/) - [Ready Mix Concrete Calculator](https://calcshed.com/ready-mix-concrete-calculator/) - [Sonotube Calculator](https://calcshed.com/sonotube-calculator/) - [Aggregate Calculator](https://calcshed.com/aggregate-calculator/) - [Cement Calculator](https://calcshed.com/cement-calculator/) - [Rebar Calculator](https://calcshed.com/rebar-calculator/) - [Concrete Bag Calculator](https://calcshed.com/concrete-bag-calculator/) - [Concrete Footing Calculator](https://calcshed.com/concrete-footing-calculator/) - [Conduit Fill Calculator](https://calcshed.com/conduit-fill-calculator/) - [Roofing Calculator](https://calcshed.com/roofing-calculator/) - [Concrete Slab Calculator](https://calcshed.com/concrete-slab-calculator/) - [Home](https://calcshed.com/) - [Surface Calculators](https://calcshed.com/surface-calculators/) - [Landscaping Calculators](https://calcshed.com/landscaping-calculators/) - [Electrical Calculators](https://calcshed.com/electrical-calculators/) - [Construction Calculators](https://calcshed.com/construction-calculators/) - [Disclaimer](https://calcshed.com/disclaimer/): Please read this disclaimer carefully before using any calculator or content on CalcShed.com. By accessing and using this website, you acknowledge that you have read, understood, and agree to the terms outlined below. Estimation Purposes Only All calculators, tools, and reference tables on CalcShed.com produce planning-grade estimates, not engineering measurements. Results are intended to help homeowners, contractors, and tradespeople approximate material quantities, project costs, and technical specifications for preliminary planning. Actual requirements vary based on factors including but not limited to site conditions, material specifications, local building codes, installation methods, compaction rates, manufacturer tolerances, and environmental conditions. Always verify calculator results with […] - [Contact](https://calcshed.com/contact/): Have a question, found a bug, or want to suggest a new calculator? We’d love to hear from you. CalcShed is a small team dedicated to building the best free construction and trade calculators on the web. Get in Touch The fastest way to reach us is by email: General inquiries: hello@calcshed.comBug reports: support@calcshed.comContent & partnerships: editorial@calcshed.com We typically respond within 1–2 business days. For bug reports, please include the calculator name, what you entered, and what result you expected. Report a Calculation Error Accuracy is our top priority. If you believe one of our calculators is producing an incorrect result, please send us […] - [Data Sources](https://calcshed.com/data-sources/): This page lists the standards, codes, specifications, and references used across Calculator Shed’s tools. Each calculator page cites the specific sources relevant to its formulas and default values. This page provides a centralized reference library. How We Select Sources Standards and Building Codes Concrete and Masonry Used for: concrete density, bag yield, mix design references, aggregate properties Asphalt and Paving Used for: HMA density defaults, compaction factors, lift thickness guidelines Electrical Used for: conduit fill calculations, wire sizing, voltage drop formulas, ampacity references Roofing Used for: shingle coverage (1 square = 100 ft²), bundle counts, waste factors, pitch-to-area conversions General Construction […] - [Methodology](https://calcshed.com/methodology/): This page explains how CalcShed tools are built: the formulas we use, the default values we set, how we handle units and conversions, how we validate results, and where the data comes from. The goal is full transparency – you should always be able to trace a result back to its formula and source. Our formulas and default values are drawn from published standards – including ASTM and ACI for concrete, the NEC (NFPA 70) for electrical, AASHTO and NRCA references for aggregates and roofing, and manufacturer technical data – and every calculator shows the formula and assumptions it uses. See […] - [Editorial Policy](https://calcshed.com/editorial-policy/): Calculator Shed is committed to providing accurate, transparent, and practical online calculators. This page explains how our tools are developed, reviewed, and maintained. How Calculators Are Developed Each calculator starts with a real estimation need – a question that homeowners, contractors, students, or professionals ask when planning a project or solving a problem. Development follows a consistent process: Review and Accuracy Standards All calculators undergo a multi-step review before publication: Formula verification: Every formula is checked against published sources and documented on the calculator page. Default value validation: Density values, coverage rates, waste factors, and other defaults are sourced from industry […] - [About CalcShed](https://calcshed.com/about/): CalcShed is a free library of construction and trade calculators – concrete, asphalt, electrical, landscaping, and surface tools. I built it to do one thing well: give you accurate material and project estimates with the formula, the assumptions, and the sources shown, so you can check the math instead of trusting a black box. Who Runs CalcShed My name is Giorgi Gaprindashvili, and I am the founder and builder of CalcShed. I want to be straight about my role: I am not a contractor, electrician, or engineer. I am the person who designs, builds, and maintains the calculators and the site. […] - [Privacy Policy](https://calcshed.com/privacy-policy/): CalcShed.com (“we,” “our,” or “us”) respects your privacy. This Privacy Policy explains what information we collect, how we use it, and the choices you have regarding your data when you visit our website. Information We Collect Information You Provide If you contact us via email, we receive the information you include in your message — typically your name, email address, and the content of your inquiry. We use this only to respond to your message and do not add you to marketing lists. Analytics and Cookies CalcShed uses Google Analytics 4 to understand how visitors use the site,such as which calculators […] ## Optional - [Agent (MCP protocol)](websites-agents.hostinger.com/calcshed.com/mcp) [comment]: # (Generated by Hostinger Tools Plugin)