About
Arrow Speed Calculator exists because the number on the bow box is never the number at the target — and the honest estimate shouldn't need a chronograph or a spreadsheet.
What this site does
I built this site to answer one question properly — how fast is my arrow, really? — and then the questions that follow it: how much energy and momentum it carries, how it balances, what it weighs, and which spine it should be. Every tool here works from published standards: the IBO rating test, Easton's shaft charts, and the Ashby Bowhunting Foundation's penetration research. Every formula is printed on the Methodology page, and the homepage's worked example can be checked with a pencil.
Who runs it
I'm Ian Welkins, based in Houston, Texas. I build and maintain a small fleet of single-purpose calculator sites, each one checked by hand against its official sources. This one I checked against the standards bodies and manufacturers linked across the site — and against a chronograph, because an estimation site that has never met the real instrument would be a poor joke.
A note on AI
I use AI tools to help draft and code these pages. Everything published is checked by me against the sources named on the site — the formulas, the worked examples and the tables included. If you find a number that doesn't survive your own arithmetic, the report an error page is the fastest way to get it fixed, and corrections are credited on the page.