Project-Based Calculators
Concrete Calculator for Every Project Type
Start from what you're actually building instead of a shape. Pick your project below for typical dimensions, or enter your own — then get cubic yards, cubic feet, cubic meters and bag counts instantly.
Quick reference: a 2-car driveway (20 × 24 ft, 4 in thick) needs about 6.5 cubic yards with waste. A 12×12 patio needs about 1.95 cubic yards. A 2-car garage slab needs about 5.4 cubic yards. Select your own project below for an exact number.
The Tool
Project Concrete Calculator
Choose a project preset to auto-fill typical dimensions, then adjust to match your actual site.
Presets use commonly cited average dimensions — always confirm against your actual site measurements before ordering.
For a truck-delivered volume this large, most suppliers recommend ready-mix over bagged concrete. See the bag calculator for brand-specific yields.
Methodology
How to Use the Project Calculator
Pick your project
Choose from 14 common presets, or select "Custom" to enter your own dimensions from scratch.
Check the dimensions
Presets use typical averages — measure your actual site and adjust length, width and thickness to match.
Set your waste factor
5% for simple, flat rectangular pours; 10% for anything irregular, sloped, or hand-mixed.
Calculate
Get cubic yards, cubic feet, cubic meters and bag counts instantly — no page reload.
Full Directory
Browse All Project Calculators
Every project type below links to its own dedicated calculator with project-specific guidance on thickness, reinforcement, and finish.
Driveway
Standard 4–6 inch driveway slabs, sized to your vehicle count.
PatioPatio
Outdoor living slabs from small pads to full backyard patios.
WalkwaySidewalk / Walkway
Narrow, linear paths — calculated per linear foot of run.
GarageGarage Slab
1, 2 and 3-car garage footprints with standard thickness presets.
ShedShed Foundation
Slab-on-grade foundations for storage sheds and workshops.
FoundationHouse Foundation
Full foundation volume estimates for new-build planning.
BasementBasement Floor
Below-grade slab pours, typically 4 inches over a vapor barrier.
PoolPool Deck
Surrounding decks sized to your pool's perimeter and walkway width.
FenceFence Posts
Bag counts per post, scaled to your total fence line.
DeckDeck Footings
Pier and footing volumes for elevated deck framing.
WallRetaining Wall
Poured concrete retaining walls by length, height and thickness.
StepsSteps / Porch
Stepped concrete for entryways and porch landings.
CurbCurb & Gutter
Residential curb sections along driveways and lot lines.
CountertopConcrete Countertop
Thin-pour volumes for kitchen and outdoor countertops.
PlanterConcrete Planter
Small DIY mold pours for garden planters.
OrnamentBirdbath / Ornament
Small decorative pours for garden features.
Sport CourtSport / Basketball Court
Full-thickness slabs sized for backyard courts.
CarportCarport Slab
Open-sided vehicle cover slabs, sized like a single driveway bay.
RV PadRV Pad
Long, reinforced pads sized to typical RV and trailer lengths.
SpaHot Tub / Spa Pad
Reinforced pads rated for concentrated static load.
MailboxMailbox Post
Small single-post footings, similar sizing to a fence post.
FlagpoleFlagpole Base
Deep, narrow footings for wind-load stability.
BenchConcrete Bench
DIY mold pours for garden and patio seating.
BarnBarn / Pole Building Slab
Large agricultural and outbuilding floor slabs.
WorkshopWorkshop Slab
Heavier-duty floors for tools, machinery and vehicle storage.
StairsExterior Concrete Stairs
Outdoor stepped concrete, calculated per riser and tread.
RampConcrete Ramp
Sloped slabs for accessibility and vehicle ramps.
CommercialParking Lot
Large-scale commercial paving volume estimates.
UtilitySump Pit / Utility Pad
Small equipment pads for HVAC, generators and utility boxes.
Water FeatureConcrete Pond
Shell and basin volumes for water features and ponds.
Direct Answers
Frequently Asked Questions
How much concrete do I need for a 2-car driveway?
A typical 2-car driveway, roughly 20 ft × 24 ft at 4 inches thick, needs about 5.9 cubic yards before waste, or about 6.5 cubic yards with a 10% allowance.
How much concrete do I need for a 12x12 patio?
A 12 ft × 12 ft patio poured 4 inches thick needs about 1.78 cubic yards, or roughly 1.95 cubic yards with a 10% waste allowance.
How much concrete does a 2-car garage slab need?
A 20 ft × 20 ft, 2-car garage slab at 4 inches thick needs about 4.9 cubic yards before waste, or roughly 5.4 cubic yards with waste. Many garages use 5 inches instead, raising this to about 6.2 cubic yards.
Do I need rebar or wire mesh for a driveway?
Yes, for most residential driveways. Wire mesh or rebar on a grid helps control cracking under vehicle load. Fiber-reinforced concrete is sometimes used as a lighter-duty alternative. See the rebar calculator for spacing guidance.
What thickness should a shed foundation be?
Most shed slabs are poured 4 inches thick, matching standard residential slab practice. Sheds storing heavy equipment or vehicles may warrant 5–6 inches with reinforcement.
Related Calculators
Explore by Shape or Material Instead
Every project above is built from an underlying shape. If your pour doesn't match a preset, start from the shape itself.