- No data uploaded
- Instant results
Slab Rebar Calculator
Estimate reinforcement for a slab: number of bars each way, total length and steel weight from size, spacing, cover and bar diameter.
Slab Rebar Calculator
Steel required61 bars per mesh · 268 m total (incl. 5% laps)
Bars along length
27 × 4.95 m
Bars along width
34 × 3.95 m
12 m bars to buy
24
Quantity estimate only — bar size, spacing and cover must come from the structural design.
Planning estimates only. Building codes, loads and material specs vary — have a licensed engineer or contractor confirm quantities and safety requirements. Disclaimer
Important
Quantity estimates for planning and ordering. Structural members, reinforcement and footings must be designed by a qualified engineer to local code.
Frequently asked questions
Is my data uploaded?
No. The calculation runs entirely in your browser — nothing you type is sent to a server.
Is it free?
Yes — free, unlimited and no sign-up.