your scales are rows and grades are blocks in each row.
align blocks to define conversions.

Edit a chart to create a simple data file
Generate images based on your data
Use Libraries to interact with your data

This project addresses The Complication of Grades Grade Adjacent and Grading Systems Overview

Why this editor? covers the rationale for this project, and how it differs from existing projects.

Research for this project turned up lots of attempts at grade conversion, but none solved the deeper issue that this project addresses. If you want a probably-fine-but-not-perfect solution, here is a curated list of alternatives.

There are many choices to be made when implementing grade conversion, many are subjective. Instead of bloating the software to fit potential use cases, this project is a base for you building on top of. See specific docs for software developers and converting between systems

Guidebook authors have been handling this issue since well before the climbing apps and sites. This page focuses on their specific needs.