I found this calculator to be far more useful than any other such I’ve ever run across, including the incredibly user-unfriendly ones on the MySocialSecurity website. Note this is not a government site but you do have to paste in your earnings history from the SS website. It claims everything is handled in your browser but of course that’s only as good as your browser security, so be aware as you’re deciding whether to use it. I decided it was worthwhile.
Also, yay; I’m past the first bend point in SS benefit calculations! It’s mathematically impossible for me to get past the second bend point unless I work until around age 90, so I’m taking the victory I can get. 