I made a spreadsheet where formulas also update backwards
Hello HN! I'm happy to release this project today. It's a bidirectional calculator (hence the name bidicalc). I've been obsessed with the idea of making a spreadsheet where you can update both inputs and outputs, instead of regular spreadsheets where you can only update inputs. Please let me know what you think! Especially if you find bugs or good example use cases.
In plain words
Bidicalc is a spreadsheet tool that enables bidirectional formula updates. Unlike traditional spreadsheets where only inputs can be modified, this application allows users to change output values and have formulas automatically recalculate corresponding inputs. It's designed for anyone working with calculations who needs flexibility to work backwards from desired results to required inputs.
written from the facts on this page · September 2026
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