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.

Concrete Bags Guide: Pallet Counts, Coverage and Project Sizes

How many bags of concrete on a pallet (42 of 80 lb, 56 of 60 lb), coverage per bag at 2, 4 and 6 in, yield tables by brand and bag counts for common slabs.

How Long Does Concrete Take to Cure?

Concrete sets in 24 to 48 hours, reaches 70% strength in 7 days and full strength at 28. Cure time chart by project and temperature, plus curing methods.

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.

Concrete Slab Cost (2026): Price per Square Foot by Size and State

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

Enter your ZIP for the local frost line depth. Frost depth map and table for 50 states + DC, plus code footing depths for 47 cities, with citations.

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 Size Chart (#3 to #18)

#4 rebar is 1/2 in, 0.20 sq in, 0.668 lb/ft. Full ASTM A615 rebar size chart with diameter in inches and mm, area, weight, soft metric and Canadian sizes.

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.