Slab Rebar Concrete Calculator
Mesh, Footing, Wire & Spacing
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Calculate rebar grids, wire mesh sheets, and concrete volume for slabs, footings, and columns. 100% offline. Lifetime purchase available.
What does SlabKit do?
SlabKit calculates rebar grid takeoffs, structural rebar design, wire mesh sheet counts, concrete volume, and a full set of jobsite estimators — all offline on your iPhone. Built for residential concrete contractors, framers, masons, estimators, and DIY pours.
Is my data private?
100% offline. Nothing leaves your iPhone. No accounts, no analytics, no ads, no third-party tracking.
How do I get started?
1. Open a tab: Slab, Mesh, or Concrete
2. Enter your dimensions in imperial or metric
3. Read the takeoff and save the project or export a PDF
What can I do with it?
- Lay out a rebar grid on any rectangular slab and get bar count, total linear length, weight, and number of standard-length sticks required (including lap overlap), with independent length/width spacing
- Design structural rebar for columns, walls, and footings — bar size, spacing, and hook length from your load and dimensions
- Estimate sheets of welded wire fabric (WWF) or rolls with adjustable overlap
- Compute concrete volume for slabs, strip and pad footings, square columns, cylindrical tubes, walls, stairs, circular slabs, curbs, and post holes
- Design a stairs run with code-compliance checks — riser/tread limits, stringer length, landing angle
- Square up a layout with the 3-4-5 method, or plan a stepped-footing drop on sloped ground
- Estimate formwork lumber, excavation volume, gravel base, block wall units and mortar, and asphalt tonnage
- Count 40, 50, 60, and 80 lb (or 25 kg) bags of concrete mix, or ready-mix truckloads with short-load warnings
- Design a concrete mix to US (ACI), UK/EU (BS/EN), or Indian (IS) standards
- Save your local material and supplier prices in a reusable price library
- Track curing with optional Day 1/3/7/28 reminders, and log test cylinders against a lab schedule
- Add a waste factor and round up automatically
- Save unlimited projects with custom names
- Export a client quote or a formal Bill of Quantities (BOQ) as PDF for the jobsite or the supplier
- Switch between imperial (#3-#8 bar, ft/in, cubic yards, lb) and metric (8-32mm bar, m/mm, cubic meters, kg)
What standards does it cover?
Rebar sizes follow ASTM A615 (US) and BS 4449 / EN 10080 (metric). Concrete mix design follows ACI 211, BS 8500 / EN 206, and IS 456. Stairs follow IRC tread/riser limits. All estimates are for planning — always confirm with your structural engineer or local building official.
What languages does it support?
English, German, French, Korean, and Japanese.
How much does it cost?
3-day free trial, then $1.99/week, $4.99/month, $29.99/year, or $79.99 lifetime.
Terms of Use: https://taxlite.net/slab_kit/terms.html
Privacy Policy: https://taxlite.net/slab_kit/privacy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
What's new in 1.2.0 — SlabKit now covers the whole job, not just the slab.
- Structural rebar design for columns, walls, and footings — bar size, spacing, and hook length calculated from your load and dimensions
- Stairs designer with code-compliance checks: riser/tread limits, stringer length, landing angle
- Square-up (3-4-5) and stepped-footing drop calculators for sloped sites
- Formwork, excavation, gravel base, block wall, and asphalt estimators
- Material price library — save your local supplier prices and reuse them across every project
- Concrete curing tracker with optional Day 1/3/7/28 reminders
- Mix design for US (ACI), UK/EU (BS/EN), and Indian (IS) standards
- Formal Bill of Quantities (BOQ) PDF export alongside the client quote layout
- Independent length/width rebar spacing — no longer locked to one on-center value
Still 100% offline. No accounts, no ads, no tracking.
The developer, ZHENGQIAO JIANG, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- ZHENGQIAO JIANG
- Size
- 3.5 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 4 more
- English, French, German, Japanese, Korean
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Weekly $1.99
- Monthly $4.99
- Lifetime $79.99
- Yearly $29.99
- Copyright
- © Alex Jiang 2026