# Concrete Calculator

> Enter slab dimensions and mix ratio to get cement bags, sand, aggregate and water instantly, with every step shown.

Calculate cement bags, sand, aggregate and water for slabs and footings from length, width, thickness and mix ratio. Free, instant, with full step-by-step math.

- **Canonical:** https://build.ailovekit.com/calculators/concrete-calculator/
- **Category:** Calculator
- **Processing:** Runs entirely in your browser. Files are never uploaded to AiLoveKit servers.

## How It Calculates

- **Formula:** Dry volume = L × W × T × 1.54; cement bags = dry × cement share ÷ 0.0347

**Inputs:**

- Length
- Width
- Thickness
- Mix ratio
- Waste %

All calculation runs locally in your browser; results update as you type and include the substituted working.

## Order Concrete Materials Without Guessing

Over-ordering wastes money; under-ordering stalls the pour. AiLoveKit's **concrete calculator** takes your slab dimensions and nominal mix ratio, applies the standard 1.54 dry-volume factor, and returns cement bags, sand, aggregate and mixing water - with every intermediate step visible so you can audit the math.

## How the Calculation Works

- **Wet volume** - length × width × thickness.

- **Dry volume** - wet × 1.54, plus your waste allowance.

- **Material split** - dry volume divided by the mix ratio parts.

Planning a full structure? Try the [Brick Calculator](https://build.ailovekit.com/calculators/brick-calculator/) and [Construction Cost Calculator](https://build.ailovekit.com/calculators/construction-cost-calculator/) next, then take everything into [your Build projects](https://build.ailovekit.com/projects/) for a complete bill of quantities.

## Frequently Asked Questions

**Why is dry volume 1.54 times wet volume?**

Cement, sand and aggregate bulk up with voids when dry. The standard factor for nominal mixes is 1.54, so 1 m³ of wet concrete needs about 1.54 m³ of dry materials.

**How many kg is one cement bag?**

One standard bag is 50 kg, which occupies about 0.0347 m³. The calculator rounds up to whole bags so you never order short.

**Which mix should I choose?**

M10/M15 for lean fill and paths, M20 for house slabs and footings, M25 for columns and heavier structural work. Confirm with your structural engineer.

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Source: https://build.ailovekit.com/calculators/concrete-calculator/
Part of AiLoveKit: https://build.ailovekit.com/
Machine-readable index: https://build.ailovekit.com/llms.txt