ConcreteCalc

concrete volume calculator — figure it before you pour it

MIX: READY / BAGGED
UNITS: US & METRIC
WASTE FACTOR: INCLUDED

Batch Ticket
NO. 000001
SHAPE: SLAB
WASTE: 10%
0.00
cubic yards (with waste)
Net volume (cu ft)0.00
Net volume (cu m)0.00
With waste (cu ft)0.00
60 lb bags0
80 lb bags0
Ready-mix trucks (10 yd³)0
Cement (50kg bags)0
Sand (cubes)0.00
Aggregate / Metal (cubes)0.00
BAG YIELD — 60LB: 0.017 YD³ · 80LB: 0.022 YD³
ESTIMATE ONLY. CONFIRM WITH SUPPLIER BEFORE ORDERING.

How to calculate concrete volume

To calculate how much concrete you need, find the volume of your pour in cubic feet, then convert to cubic yards for ordering. For a rectangular slab or footing, multiply length × width × thickness (in feet). For a round column or circular slab, use the area of a circle (πr²) multiplied by height or thickness. For stairs, sum the volume of each step. This calculator handles all of these shapes automatically and converts the result into cubic yards, cubic meters, 60lb/80lb bag counts, and ready-mix truck loads — including an adjustable waste factor for spillage and uneven subgrade.

Frequently asked questions

How do I calculate how much concrete I need?

Multiply the length, width and thickness of your pour (in feet) to get cubic feet, then divide by 27 to get cubic yards. For round shapes, use the area of a circle instead of length times width.

How many bags of concrete do I need for a cubic yard?

One cubic yard needs roughly 60 bags of 60lb concrete mix, or about 45 bags of 80lb mix.

How much waste factor should I add to a concrete order?

Most contractors add 5 to 10 percent extra for uneven subgrade, spillage and form variance. Irregular shapes often warrant 15 to 20 percent.

How many cubic yards fit in a ready-mix truck?

A standard ready-mix truck carries about 10 cubic yards, ranging from 8 to 11 yards depending on the truck.

Can I use this concrete calculator in metric units?

Yes — use the US / Metric toggle above the tabs to switch every field to meters and centimeters and the headline result to cubic meters.

How do I calculate cement, sand and aggregate for a 1:2:4 mix?

Select the Sri Lanka (Mix) tab. Per 100 cubic feet of volume (with waste), a standard 1:2:4 ratio needs about 22.6 bags of 50kg cement, 44 cubic feet (≈0.44 cubes) of sand, and 88 cubic feet (≈0.88 cubes) of aggregate.

Privacy Policy

Last updated: July 2026

Overview

This Privacy Policy explains how ConcreteCalc ("we," "us," or "our") handles information when you use the concrete calculator and this website. The calculator runs entirely in your browser — the numbers you enter are never sent to our servers.

Information we collect

We do not require an account, and the calculator does not collect or store the values you type in. Depending on hosting, the following limited data may still be collected automatically:

  • Usage data: standard web server logs (IP address, browser type, pages visited) that most hosting providers collect automatically.
  • Analytics: if analytics tools are added in the future, they may use cookies to measure traffic. This policy will be updated if that changes.
  • Contact information: if you email us, we receive whatever you include in that message.

How we use information

  • To operate, maintain and improve this website and calculator.
  • To respond to questions, feedback or support requests.
  • To understand aggregate usage trends, if analytics are enabled.

Cookies and local storage

The calculator does not use cookies or browser storage to save your inputs — each visit starts fresh. Your light/dark mode preference applies for your current session only.

Third-party links

This site may link to third-party resources. We are not responsible for the privacy practices of external websites.

Children's privacy

This site is not directed at children under 13, and we do not knowingly collect personal information from children.

Changes to this policy

We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated date.

Contact us

Questions about this Privacy Policy: muddikaofficial@gmail.com.

Terms & Conditions

Last updated: July 2026

Agreement to terms

By accessing or using this website and the ConcreteCalc concrete calculator ("the Service"), you agree to be bound by these Terms & Conditions.

Use of the calculator

The Service is provided free of charge for personal, educational and professional planning purposes.

Estimates only — no guarantee of accuracy

The calculations are estimates only, based on standard geometric formulas and typical bag yield figures. Actual needs can vary due to subgrade conditions, form accuracy, mix design and job-site variables.

  • Always confirm quantities with a qualified contractor, engineer, or your ready-mix supplier before ordering.
  • Add an appropriate waste factor for your specific job — defaults are general guidance, not a guarantee.
  • We are not responsible for over-ordering, under-ordering, delays, or costs from reliance on these estimates.

No professional advice

Nothing on this site constitutes structural, engineering or construction advice. Consult a licensed professional for load-bearing structures, permits, or code compliance.

Intellectual property

The design, layout and code of this website are owned by ConcreteCalc unless otherwise noted.

Limitation of liability

The Service is provided "as is" without warranties of any kind. ConcreteCalc is not liable for indirect, incidental or consequential damages arising from use of this Service.

Changes to the Service or these terms

We may update these terms, or modify or discontinue the Service, at any time. Continued use after changes are posted constitutes acceptance.

Governing law

These terms are governed by the laws of the jurisdiction in which ConcreteCalc operates.

Contact us

Questions about these Terms: muddikaofficial@gmail.com.

Contact Us

Have a question about the calculator, spotted something that looks off, or want a shape or feature added? We read every message.

Email us directly
muddikaofficial@gmail.com
Send an email

What to reach out about

🐛

Bug reports

Found a calculation that looks wrong? Tell us the shape, inputs, and what you expected.

💡

Feature requests

Need a new shape, a currency estimate, or a unit we don't support yet? Let us know.

🤝

Partnerships

Suppliers, contractors and sites interested in linking or collaborating are welcome to reach out.

Response time

This is a small, independently run tool, so replies typically take 1–3 business days. For legal or privacy-specific questions, see the Privacy Policy and Terms & Conditions above.