Rebar Calculator
Use this rebar calculator to estimate bar weight, linear weight, and material cost from diameter, length, density, quantity, and price. It is a quick planning tool for slabs, footings, and reinforced concrete work.
Result
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What This Rebar Calculator Helps You Do
Use this rebar calculator to estimate bar weight, linear weight, and material cost from diameter, length, density, quantity, and price. It is a quick planning tool for slabs, footings, and reinforced concrete work.
How to Calculate Rebar Calculator
- Measure the rebar inputs - Enter the dimensions, spacing, density, or thickness values that define the rebar weight, linear weight, and cost.
- Check the units - Keep every input in the same unit system so the output stays consistent and easy to compare.
- Choose the solve mode - Select the output you want, such as length, weight, volume, posts, or cost.
- Read the output - Use the main result and the extra detail rows to verify the estimate before you order materials or build.
Rebar Calculator Formula
| Symbol | Definition | Unit |
|---|---|---|
| d | Bar diameter | m |
| L | Bar length | m |
| ρ | Density | kg/m3 |
| n | Quantity | count |
| p | Price per kg | USD/kg |
Worked Examples
- diameter: 16
- length: 12
- density: 7850
- quantity: 8
- pricePerKg: 0.9
Result: Rebar weight = 151.52 kg
A slab grid needs a quick check on bar weight before ordering. The estimate is 151.52 kg.
- diameter: 12
- length: 6
- density: 7850
- quantity: 20
- pricePerKg: 1.05
Result: Rebar cost = 111.86 USD
A footing order is easier to compare when you know total steel cost. The estimate is 111.86 USD.
- diameter: 20
- length: 10
- density: 7850
- quantity: 4
- pricePerKg: 1.1
Result: Linear rebar weight = 2.47 kg/m
Linear weight is the fastest way to compare bar sizes. The estimate is 2.47 kg/m.
- diameter: 25
- length: 14
- density: 7850
- quantity: 12
- pricePerKg: 1.0
Result: Rebar weight = 647.36 kg
Large slabs quickly add mass, so the weight check matters before delivery. The estimate is 647.36 kg.
How to Interpret Your Results
| Range | Meaning | Action |
|---|---|---|
| < 50 kg | Small reinforcement order | Usually manageable as a small delivery or pickup. |
| 50–250 kg | Typical residential order | Common for slabs, footings, and short wall runs. |
| > 250 kg | Large reinforcement order | Check delivery handling and any cut-loss allowance. |
Frequently Asked Questions
Sources
Last reviewed: March 2026