Concrete Calculator

Concrete Calculator

Enter dimensions. See bags and ready-mix.

Calculated locally No tracking Prices stay on this device

Patio example · 10 × 10 × 4 in · editable

Your pour

Measure the section

1 section
What are you pouring? Patio Slab / patio · edit the measured dimensions below
10 ft
10 ft
4 in
identical slabs
Quick thickness
Input check Measured visual
length 10 ft width 10 ft thickness 4 in depth edge exaggerated
Footprint proportions follow the inputs. The thickness edge is exaggerated for visibility and labeled with the measured value.
%
Prices & supplier rulesExample inputs — replace with a retailer receipt or supplier quote Example

Every visible line is included; blank means not priced and $0 means intentionally free or already owned.

Bag prices
Ready-mix quote
Mixer & transport assumptionsTurn bag count into a feasibility check Editable

Use actual usable mixer output and the vehicle's door-jamb/manual payload. These are planning inputs, not productivity or safety ratings.

Base & reinforcement takeoffOptional material counts from your explicit layout — no structural recommendation Off

Optional takeoffs are off. No spacing or material is recommended by the calculator.

Method & limits

Every number keeps its assumption attached.

01

Combine, then round

All valid sections become one net volume. Waste is applied once. Each bag size and ready-mix order then rounds independently.

02

Use one named bag profile

Default 40/50/60/80 lb yields and water ranges come from QUIKRETE Concrete Mix No. 1101, reviewed August 2026. Check your product label.

03

Keep pricing honest

Supplier increments, minimums, capacity, delivery, short-load rules, and every compared fee stay visible and editable. No national-price claim is used.

04

Measure material, not structure

This tool does not choose PSI, thickness, frost depth, reinforcement, load design, access plan, or code compliance. Confirm those separately.

Bag profile source Unit conversion source

Quick compare

Compare local bag and ready-mix cost

Enter the prices you can actually buy. The calculator keeps the visible supplier minimum, increment, capacity, and short-load threshold.

Current advanced rules: 1.00 yd³ minimum · 0.25 yd³ increment · 10.00 yd³ truck capacity · short-load threshold 4.00 yd³.

Reset project

Return to the patio example?

This replaces all sections, waste, prices, effort, and optional takeoffs. You can undo once after resetting.

Share project

Copy a restorable project link

Geometry and units are included by default. The calculation still runs locally when the link opens.

Privacy & terms

Privacy

No account, cookie, tracking SDK, fingerprint, upload, database, or third-party page resource is used. Preferred units and editable procurement settings may be saved in local browser storage. A share link contains bounded project geometry; prices are included only when you check the explicit option.

Terms and limitations

Outputs are planning estimates based on entered dimensions, visible assumptions, one named bag profile, and configurable supplier rules. Verify measurements, product labels, retailer prices, supplier quote, vehicle payload, mixer capacity, site conditions, taxes, access, placement, finishing, and local requirements before purchase or work.

The calculator does not provide structural, engineering, building-code, excavation, utility-location, reinforcement, load, mix-design, safety, or professional advice. Use a qualified professional and local authorities where required.