Free Concrete Calculator - Cubic Yards

What it does

Four shape modes (slab, footing, column, post hole), adjustable waste factor, bag counts for 80lb and 60lb mix, optional cost estimate, saveable URL, dark mode. All in one fast single-page tool.

Free concrete calculator. Instantly calculate cubic yards, cubic feet, and bags of concrete needed for slabs, footings, columns, and post holes. Instant results, no signup.

Instantly calculate cubic yards, bags, and cost for any project. Free to use. Copy the code below and paste it into anyfrom slabfast.com

• 
  FreeConcreteCalcJul 2026 · freeconcretecalc.com · ▲5

  Calculate Concrete for Any Project — Bags, Yards & Cost

• CC
  Concrete Calculator for your weekend projects around the house2018 · concretecalculator.io · ▲38
• 
  How Much Concrete Do You Need?Jan 2026 · howmuchconcrete.webflow.io · ▲3

  Slabs, Footers, Walls, Columns, Steps, Curbs, Gutters.

• 
  Slab EstimatorAug 2026 · slabestimator.org · ▲2

  Free Concrete Slab & Bag Count Calculator

• 
  Concrete CalculatorFeb 2026 · concrete-calculator.vip · ▲2

  Concrete Calculator – Free Online Concrete Volume Calculator

• 
  Concrete CalculatorJan 2026 · concretecalculator.site · ▲1

  Online Advanced Concrete Calculator

• 
  SimCity, but with Permits▲930

  A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.

  Life & fun · 2d ago · permit.petercai.com

• IV
  I've been paying for a rural Tanzanian's education for 10 years▲778

  Life & fun · 15d ago · tanzaniaeducationproject.org

• 
  Bigwords.page – Turn any screen into a sign. The URL is the app▲728

  Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.

  Life & fun · 16d ago · bigwords.page

• 
  Guitoro, a virtual guitar you strum with your keyboard▲573

  Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.

  Life & fun · 9d ago · guitoro.com

• 
  See *almost* any carriers phone settings▲432

  Carrier settings from iPhone, Pixel and Galaxy firmware, decoded and compared: APNs, VoLTE, 5G and Wi-Fi Calling per carrier, and what each build changed.

  Life & fun · 13d ago · carrierexplode.com

• 
  The whole Solar System and every tracked satellite, live in the browser▲407

  Life & fun · 23d ago · space.bl2.net

• 
  Brew ▲900

  Like Claude design for email marketing

  AI · May 2026 · brew.new

• 
  Kilo Code for VS Code▲896

  Parallel agents, diff reviewer, and multi-model comparisons

  Dev tools · May 2026 · kilo.ai

• 
  StoreClaw▲806

  Grow your store profits with agents that know how to sell

  AI · May 2026 · storeclaw.ai

• 
  PollyReach▲795

  Give your agent a real number and voice to make calls.

  AI · May 2026 · pollyreach.ai

• 
  Needle: We Distilled Gemini Tool Calling into a 26M Model▲776

  Hey HN, Henry here from Cactus. We open-sourced Needle, a 26M parameter function-calling (tool use) model. It runs at 6000 tok/s prefill and 1200 tok/s decode on consumer devices. We were always frustrated by the little effort made towards building agentic models that run on budget phones, so we conducted investigations that led to an observation: agentic experiences are built upon tool calling, and massive models are overkill for it. Tool calling is fundamentally retrieval-and-assembly (match query to tool name, extract argument values, emit JSON), not reasoning. Cross-attention…

  Life & fun · May 2026 · github.com

• 
  Files.md – Open-source alternative to Obsidian▲730

  🌱 Private, quiet space for thinking. Simple app for .md files. - zakirullin/files.md

  Dev tools · May 2026 · github.com