Concrete Guides and Code Charts

5 Common Concrete Mistakes That Ruin DIY Projects

Avoid costly concrete failures. Learn the 5 most common mistakes DIYers make when pouring concrete and how to prevent them for a successful project.

How Many Bags of Concrete for Fence Posts?

Charts for bags of concrete per fence post and per fence. A 4x4 in a 12 x 24 in hole takes 4 bags of 50 lb mix. Covers hole size, dry pour and gate posts.

How Many Bags of Concrete Do You Need?

Yield tables for 40, 50, 60 and 80 lb concrete bags, bags per cubic yard, bags per pallet, brand comparisons and pre-calculated project estimates.

Concrete Footing Size Chart: IRC Table R403.1(1)

Minimum concrete footing width and thickness from IRC Table R403.1(1), by stories, construction type and soil bearing capacity. 2018, 2021, 2024 codes.

What Does a Concrete Slab Actually Cost?

2026 concrete slab cost: $6-8 per sq ft in materials, $10-16 installed. Price tables by slab size, region and project type, plus a cost calculator.

How to Calculate Concrete for Stairs

Plan concrete stairs: IRC rise and run limits, two volume calculation methods with worked examples, landing pads and bags vs ready-mix guidance.

Deck Footing Size Chart: Diameter & Depth by Post Spacing

Deck footing size chart per IRC R507.3 and AWC DCA-6: diameter by tributary area, post spacing and soil bearing, plus frost depth and pier guidance.

Frost Line Depth by Zip Code

Find your local frost line depth by state and city. Complete state-by-state frost depth table, city building code requirements, and how to determine the right footing depth for your concrete project.

How Many Bags of Concrete Do I Need?

Bag yields by size, slab and fence post bag counts, the dry-pour question answered honestly, and the break-even point where ready-mix beats bags.

How to Calculate Concrete

The plain-English guide to calculating concrete. Covers the formula, the shapes, waste factors, bags vs ready-mix, and the mistakes that blow up the math.

How to Calculate Yards of Concrete

Calculate cubic yards of concrete with one formula, quick-reference tables and 6 worked examples for slabs, patios, driveways and sidewalks.

How to Estimate Concrete Yards

Calculate cubic yards, pick the right waste factor and place a ready-mix order without surprise short-load fees. Includes a dispatcher script.

Rebar Spacing Guide

Rebar spacing for slabs, driveways, footings and walls: size charts, ACI 318 spacing rules in plain English, placement depth and quantity math.

Rebar Weight Chart: lb/ft and kg/m for #3 to #18

Rebar weight per foot: #3 0.376 lb, #4 0.668 lb, #5 1.043 lb, #6 1.502 lb. Full ASTM A615 chart for #3 to #18 in lb/ft, kg/m and per 20 ft stick.

Snow Load by Zip Code

Find your ground snow load (pg) by state and city under IRC R301.2 and ASCE 7-22. State table, lookup steps and how pg converts to roof snow load.

Soil Bearing Capacity Chart by State

Presumptive soil bearing capacity from IRC Table R401.4.1 for bedrock, gravel, sand and clay, with state amendments and what it means for footing size.