About

One bend. A traceable calculation.

Bendnote separates outside legs, allowance, setback and deduction in one explicitly entered model.

This free calculator requires no account or paid tier. It performs its arithmetic in your browser and creates local text and CSV reports. It is intended for inspecting a drawing or educational geometric model, not choosing a material or guaranteeing a manufacturing outcome.

Calculation policy

Decimal length inputs keep exact rational millimetre values through unit changes. The special 90° setback uses exact entered values. Numerical π and tangent outputs are approximate and visibly rounded to six decimal places. Original inputs and the model definitions remain in exports.

The default K-factor is an illustration, not advice. See the worked guide for the two paths to the same ideal flat length and the distinctions among angle, opening, outside leg and tangent leg.

Support and current services

Advertising may support this free website later. Publisher metadata and ads.txt are prepared, but this host currently has no active advertising, consent-management or analytics loader. No advertising approval, serving or income is claimed.

The contact page uses the portfolio's existing verified shared public forwarding alias. For hosting and local export information, see privacy.