dergyrt you don't think so what?
This works great for me with very little deviation from what i find is the actual sprint. it's a bar graph for me (you can implement it however you like)
Edit: oh i see, you are saying it doesn't match up for you... got it. yeah i've found it to be 90% accurate which in the absence of anything else / official, works great for my use. Let me know if you get something closer 🙂