I think you should add Taproot to your Bitcoin transaction size calculator.
Now you have it for Legacy, Native Segwit and Nested Segwit.
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I guess you missed the point of this thread. It's about advertisement on OP's website, not about a potential upgrade or adding new stuff there.
If you have suggestions about improving his website, probably is better to go on their ANN thread and explain there.
For example
https://bitcointalk.org/index.php?topic=5289916.0Thank you both for your comments.
You are right about taproot. I am reviewing and writing the whole website again. I will make some improvements in the code and in the layout and new features.