How I work
Each of my sites does one family of jobs. This one covers archery ballistics: the formulas come from the IBO and ATA standards, Easton's published charts and the Ashby Foundation's research, and the Methodology page shows all of it — model, constants, limits — so anyone can audit the maths. I use AI tools for drafting and code; the checking, the worked examples and the final say are mine.
Sites I maintain
- Gravel Calculators — aggregate and coverage calculators
- Retirement Date Calculator — retirement dates and countdowns
- Cross Stitch Calculator — fabric and project sizing
- Candle Wax Calculator — wax, fragrance and container maths
- Ski Length Calculator — ski and pole sizing
- Army Body Fat Calculator — the official tape-test standard
- Golf Club Length Calculator — club fitting lengths
- Rafter Length Calculator — roof rafter maths
- Quilt Backing Calculator — backing fabric yardage
Contact
The fastest route is email — ianwelkins@gmail.com — or the contact page. Errors reported get fixed and credited.