鉄筋電卓 − 重量・定尺・配筋・生コン

[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.