Concrete Calculators
Estimate concrete volume for slabs, footings, piers, and curbs. Every calculator returns cubic yards, bag counts, ready-mix cost, and delivery — with the formulas and mix assumptions spelled out.
Calculators
Concrete Slab
Estimate concrete for slabs, patios, and driveways.
Concrete Footing
Estimate concrete for strip and pad footings.
Sonotube
Concrete for cylindrical Sonotube forms.
Concrete Curb
Estimate concrete volume for curbs and edging by length, width, and height.
Sidewalk
Estimate concrete for sidewalks, walkways, and paths.
Concrete Bags
Convert a project volume into 40, 60, and 80 lb concrete bags.
Concrete Column
Estimate concrete for rectangular and round structural columns.
Related guides
How to Estimate Concrete for a Slab
Cubic yards = area × thickness ÷ 27. Add 10% waste. Over ~1 cubic yard, switch from bags to ready-mix.
How to Calculate Cubic Yards
A cubic yard is the standard unit for bulk material. Here's the formula and a worked example.
Concrete Field Tools
Quick conversion and layout tools for concrete estimating and field checks.
Concrete Slope Calculator
Calculate concrete fall, percent grade, and drainage slope. Use 1/8", 1/4", 3/8", or 1/2" per foot presets — or enter any custom slope.
Percent Grade Converter
Convert between percent grade, inches per foot, decimal slope, and total fall. Live bidirectional calculation.
Inches ⇄ Decimal Feet
Convert inches and construction fractions (1/16 to 1/2) to decimal feet and back. Fast, mobile-friendly, no sign-up.
Decimal Feet ⇄ Feet & Inches
Convert decimal feet (12.375) into feet and inches with 1/4", 1/8", or 1/16" precision.
Fraction ⇄ Decimal
Convert construction fractions like 3 5/8" to decimal inches, decimal feet, or back to fractions at 1/16" precision.