# Steel Calculator

> Rebar weight from bar diameter using d²/162.28, with totals for any bar length and count.

Calculate steel rebar weight free: unit weight from diameter (d²/162.28) and totals for any bar length and count. Instant, step-by-step, in your browser.

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

## How It Calculates

- **Formula:** Weight (kg/m) = d² ÷ 162.28

**Inputs:**

- Bar diameter
- Length per bar
- Number of bars

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

## Know the Weight Before the Truck Arrives

Steel is sold by weight, but drawings count bars. AiLoveKit's **steel calculator** bridges the gap: pick a diameter, enter bar length and count, and get unit weight (kg/m) plus the total order weight using the standard d²/162.28 formula. Useful for checking deliveries, estimating saria budgets and converting bar lists to kilograms.

## Typical Unit Weights

- **8 mm** - 0.395 kg/m

- **12 mm** - 0.888 kg/m

- **16 mm** - 1.578 kg/m

- **25 mm** - 3.853 kg/m

Combine with the [Concrete Calculator](https://build.ailovekit.com/calculators/concrete-calculator/) to budget both materials together.

## Frequently Asked Questions

**Where does d²/162.28 come from?**

It is the rebar weight formula derived from steel density (7850 kg/m³): weight per meter = π/4 × d² × 7850, simplified to d²/162.28 with d in mm.

**How accurate is this?**

Within about ±3% of mill certificates. Deformed bars carry ribs that add a little weight over plain rounds.

**Can I estimate steel for a whole slab?**

Rough planning uses 80 to 120 kg per m³ of concrete, but final quantities must come from the structural drawings and a bar-bending schedule.

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