An extension for dndbeyond that converts the measurements on the website in the metric system using Matthew Roy's method.
Converts measurements in D&D Beyond character sheets and monster stats from imperial to metric.
BeyondMetric converts measurements on D&D Beyond from imperial to metric using the method proposed by Matthew Roy in Metric & Magic: The Metric System and 5e.
This extension is open source and you can find it on GitHub: https://github.com/bmarian/beyondMetric