鉄筋電卓 − 重量・定尺・配筋・生コン
Utilities
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
[Built for rebar, formwork and site crews]
Run the numbers on site. Enter the bar size and length for total weight, the span and pitch for bar count, and get stock-cut loss, concrete volume and mixer-truck count from your phone.
[What it calculates]
- Rebar weight: total weight from size (D10-D51), length and count (JIS nominal unit mass)
- Stock-cut & loss: required stock bars, offcut and loss rate
- Spacing to count: bar count and actual pitch from span, pitch and end clearance
- Concrete volume: volume and mixer-truck count from member size x qty and loss
- Lap / development length: required length from size and multiplier (editable quick table)
- Unit convert: tsubo, square meters, jo, shaku, kg, t
[Takeoff (Pro)]
Group line items by bar size, sum the total weight, and share as a PDF.
[Privacy & offline]
All data stays on your device. No servers, no logins, no ads, no required network.
[Pricing]
The basic calculators are free. The Pro upgrade (one-time, no subscription) unlocks the takeoff sheet, takeoff PDF export, unlimited saved history and the company-logo feature.
Note: results are an aid. Always confirm final ordering and construction against the drawings, standards and specifications.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
You can now choose the ready-mix truck capacity (4.5/4.0/3.0/2.0 m³) in the concrete calculation. A sample purchase order can be opened from the empty takeoff screen. Also fixed the bottom of the purchase screen being hidden behind the navigation bar, and unclear messages when a purchase or printing fails.
The developer, Moeki Kozawa, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Moeki Kozawa
- Size
- 64.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Rebar Calc Pro $4.99
- Copyright
- © 2026 Moeki Kozawa