GeniesMag brings together free online construction calculators for your next project. Work out material quantities, volumes, and costs in seconds, with every tool showing the method and sources behind its numbers.
There is no sign-up and nothing you enter is stored. Each calculator runs in your browser and supports both metric and imperial units.
Browse concrete calculators See how they work
Popular Construction Calculators
These are the tools people reach for first.
Cubic yards, bags, weight, and cost for slabs, footings, and columns.
Concrete for a slab in yards, bags, weight, and area.
Price a pour by the yard, including delivery and short-load fees.
Driveway cost from concrete, gravel base, labor, and reinforcement.
Cement, sand, gravel, and water by mix ratio.
How many ready-mix truck loads your pour needs.
Explore Calculator Categories
Our tools are grouped by trade and task. Concrete is live now, and more categories are on the way.
Volume and ordering, cost, slabs and flatwork, mixing, and more. Over two dozen tools for every stage of a pour.
Coming soon: masonry, framing, roofing, flooring, and site work calculators.
Construction Guides
The guides explain the rules, methods and limits behind the numbers: how thick, how deep, how wide, how long, and what the code and manufacturers say. Each one lists its sources.
What You Can Calculate
- Estimate concrete volume in cubic yards, cubic feet, or cubic meters.
- Work out cement, sand, gravel, and the number of bags for a mix.
- Size slabs, driveways, patios, footings, and garage floors.
- Budget a pour, including delivery and short-load fees, using your own prices.
- Find ready-mix truck loads, bag counts, and pallet quantities.
- Switch between metric and imperial units as you work.
How to Use the Calculators
- Choose the calculator that matches your task.
- Enter your dimensions and material details.
- Pick your units and any options, such as a waste allowance or bag size.
- Read the result, along with the method, assumptions, and sources.
Who These Calculators Are For
GeniesMag calculators help homeowners and DIY users plan a project, and give contractors, builders, estimators, and students a fast, consistent way to check quantities and costs.
Results are estimates for planning. They are not a substitute for a supplier quote or professional engineering advice.
Methods, Sources, and Units
Each calculator uses standard formulas, material yields, and mix ratios, and shows a worked example so you can follow the math. Figures are reviewed by Prof. Dr. Khalil Mudassar, PhD, and every page lists its sources.
Where it helps, you can switch between metric and imperial units, and money tools let you choose your currency.
Frequently Asked Questions
What Are Construction Calculators Used For?
They turn the dimensions of a job into the quantities and costs you need, such as how much concrete to order, how many bags to buy, or what a slab will cost. They save time and reduce the risk of ordering too much or too little.
How Do I Calculate Construction Material Quantities?
Enter the length, width, and thickness or depth of the work, choose your units, and the calculator works out the volume and the materials it needs. A small waste allowance covers spillage and uneven ground.
Can I Estimate Construction Costs Online?
Yes. Our cost calculators use the prices you enter, such as a price per cubic yard or per bag, so the estimate reflects your local rates. The result is a planning figure, not a formal quote.
What Measurements Do I Need Before I Start?
Usually the length and width of the area and the thickness or depth, in feet or meters. Some tools also ask for a bag size, a mix ratio, or a price. Each field explains what it needs.
Do the Calculators Support Metric and Imperial Units?
Yes. Concrete results show cubic yards, cubic feet, and cubic meters, and other tools convert as you go, so you can work in the units you prefer.
How Accurate Are Online Construction Estimates?
The math is exact, and the quantities are reliable when your measurements are. Treat the results as a planning estimate: confirm the final amount with your supplier, and get professional advice for structural or load-bearing work.
Start Calculating
Pick a tool and get your numbers in seconds.