Concrete Calculator for accurate pours, every time
Estimate concrete volume and material needs for slabs, columns, footings, circular pads and walls in seconds — with automatic cement, sand and gravel estimates.
Five calculators, one workflow
Pick a shape, enter your dimensions, choose a unit — your volume and material estimate update instantly.
Slab Calculator
For driveways, patios and floor slabs. Enter length, width and thickness.
Material estimate
Column Calculator
For rectangular concrete columns. Enter height, width and depth.
Material estimate
Footing Calculator
For strip or pad footings. Enter length, width and depth.
Material estimate
Circular Slab Calculator
For round pads and posts. Enter diameter and thickness.
Material estimate
Wall Calculator
For concrete or block-fill walls. Enter length, height and thickness.
Material estimate
Quick Unit Converter
Convert a single length between feet, meters, inches, centimeters and millimeters.
Built to make concrete math simple
Concrete Calculator was built for contractors, DIY builders, students and estimators who need a fast, dependable way to work out how much concrete a job needs — without pulling out a calculator and a formula sheet.
Turn raw dimensions into a usable volume and material list in seconds.
Reduce over-ordering, avoid re-measuring, and plan multiple pours faster.
Every calculator uses standard, transparent construction-industry formulas.
Covers the shapes most common on residential and light commercial sites.
Cement, sand and gravel are estimated alongside every volume result.
Built for real job-site math
Everything you need to plan a pour with confidence — nothing you don't.
100% Accurate Calculations
Formulas built on standard construction volume and mix-ratio math.
Easy to Use
Pick a shape, type your dimensions, and read the result instantly.
Responsive Design
Works cleanly on desktop, tablet and phone, on-site or in the office.
Multiple Shape Calculators
Slabs, columns, footings, circular pads and walls, all in one tool.
Construction Friendly
Terminology and units that match how crews actually measure a job.
Material Estimation
Automatic cement bag, sand and gravel estimates for every pour.
Unit Conversion
Switch between feet, meters, inches and centimeters at any time.
Instant Results
No page reloads — results update live as you type.
Free Tool
No account, no paywall — every calculator is free to use.
Printable Results
Print or save your estimate as a clean, ready-to-share summary.
How to use the calculator
Five steps from empty form to job-ready material list.
Select Calculator
Choose slab, column, footing, circular slab or wall.
Enter Dimensions
Type in the length, width, height, depth or diameter.
Choose Unit
Pick feet, meters, inches or centimeters to match your plans.
Click Calculate
Or just keep typing — results update live as you go.
View Results
Read your volume and material estimate, then copy or print it.
Concrete types
Not every pour calls for the same mix. Here's what each type is best suited for.
Ready-Mix Concrete
Batched off-site to spec and delivered fresh — the standard choice for most slabs and driveways.
High Strength Concrete
Formulated for higher compressive strength, used in structural columns and heavy-load floors.
Reinforced Concrete
Poured around steel rebar or mesh to resist tension in beams, footings and walls.
Lightweight Concrete
Uses lighter aggregates to reduce dead load on upper floors and roof decks.
Decorative Concrete
Stamped, stained or polished finishes for patios, walkways and interior floors.
Precast Concrete
Cast off-site in forms, cured, then transported and set in place on site.
Self-Compacting Concrete
Flows into formwork under its own weight, ideal for dense rebar and tight forms.
Fiber Reinforced Concrete
Mixed with steel, glass or synthetic fibers to control cracking and boost toughness.
Applications
This calculator works for any of these common concrete pours.
Construction tips
A few reminders that make the difference between a good pour and a great one.
Proper Mixing
Mix until color and texture are uniform — under-mixed concrete weakens unevenly.
Water Ratio
Too much water lowers strength; follow the mix design's water-cement ratio closely.
Curing Time
Keep concrete moist for at least 7 days to reach full design strength.
Weather Conditions
Avoid pouring in freezing temperatures or direct, fast-drying heat.
Reinforcement
Place rebar or mesh at the correct depth before the pour, not after.
Pouring Tips
Pour continuously where possible to avoid weak cold joints.
Finishing Tips
Float and trowel at the right moisture stage for a smooth, durable surface.
Safety Tips
Wear gloves and eye protection — wet concrete is caustic on skin.
Why use this calculator
Skip the guesswork and the over-ordering.
Fast
Get a volume estimate in under a minute.
Reliable
Consistent formulas, every calculation.
Easy
No manual formulas or spreadsheets needed.
Accurate
Built on standard construction math.
Time Saving
Plan multiple pours back to back.
Material Saving
Order closer to what you'll actually use.
Mobile Friendly
Use it right from the job site.
Construction Ready
Built around real-world pour scenarios.
Unit conversion guide
Common length and volume conversions used in concrete work.
| Conversion | Formula | Example |
|---|---|---|
| Feet ↔ Meter | 1 ft = 0.3048 m | 10 ft = 3.048 m |
| Inches ↔ Centimeter | 1 in = 2.54 cm | 12 in = 30.48 cm |
| Millimeter ↔ Meter | 1000 mm = 1 m | 250 mm = 0.25 m |
| Yards ↔ Feet | 1 yd = 3 ft | 4 yd = 12 ft |
| Cubic Feet ↔ Cubic Meter | 1 ft³ = 0.0283 m³ | 100 ft³ = 2.83 m³ |
| Cubic Yard ↔ Cubic Meter | 1 yd³ = 0.7646 m³ | 10 yd³ = 7.646 m³ |
Common concrete mix ratios
Cement : sand : aggregate ratios by grade, from general use to structural work.
| Grade | Ratio (C:S:A) | Typical Use |
|---|---|---|
| M10 | 1 : 3 : 6 | Leveling courses, non-structural fill |
| M15 | 1 : 2 : 4 | Light footings and pathways |
| M20 | 1 : 1.5 : 3 | Slabs, driveways, general RCC work |
| M25 | 1 : 1 : 2 | Structural columns and beams |
| M30 | 1 : 0.75 : 1.5 | Higher-load structural elements |
| M35 | Design mix | Heavy structural and industrial floors |
| M40 | Design mix | High-strength structural applications |
Frequently asked questions
Everything you need to know about using the concrete calculator.
It's a tool that estimates how much concrete and how many materials you need for a slab, column, footing, circular pad or wall based on the dimensions you enter.
It uses standard construction volume formulas and mix-ratio math, so results are accurate for planning. Always confirm with your supplier for final orders.
Multiply length × width × thickness. The calculator does this automatically once you enter your dimensions and unit.
The calculator estimates bags automatically based on your volume and a standard mix ratio, shown in the material estimate section of your result.
A cubic yard is a unit of volume equal to 27 cubic feet — the standard unit ready-mix concrete is ordered by in the US.
Concrete is measured by volume, typically in cubic yards or cubic meters, based on the space it needs to fill.
Yes. Every calculator supports feet, meters, inches and centimeters — switch units at any time.
Yes, each result card has a Print button and a Download PDF option that opens a printable summary.
Yes, the entire site and calculator are fully responsive and built for use on-site from a phone.
Use whichever unit matches your plans or tape measure — the calculator converts internally either way.
A footing is the base element that spreads load into the soil; the foundation is the broader structure built on top of it.
Slab volume depends on all three dimensions — length, width and thickness — so thickness is required for an accurate estimate.
The Circular Slab calculator uses the same diameter-based formula and works well for round pads, footings and post bases.
Material estimates are based on a standard 1:1.5:3 (cement:sand:aggregate) mix with a 1.54 dry-volume factor, comparable to M20 grade.
Results reflect the exact volume entered. Many builders add 5-10% extra when ordering to cover spillage and uneven subgrade.
Yes, every calculator on this site is completely free, with no account or sign-up required.
Yes, the Wall calculator estimates solid concrete volume, which works as a starting point for block-fill planning too.
Sand is the fine aggregate and gravel is the coarse aggregate — both combine with cement and water to form concrete.
No account is needed — use Copy Result or Print to save a summary of your calculation.
No. This tool is for planning and estimating only — always consult a licensed engineer for structural design decisions.
Contact us
Questions, feedback or a feature request — send it our way.
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