Most ballistics apps were built for rifles and stretch a single bullet curve over your pellet. PelletArc is airgun-first: it solves real diabolo, slug, wadcutter, round-ball and .22LR trajectories with purpose-built drag laws, lets you true the ballistic coefficient from your own drops, and hands you the holdover in mil, MOA or centimetres on one screen.
Three things separate a real pellet calculator from a rifle app with a custom BC field. PelletArc was built around all three.
A diabolo, a slug and a wadcutter each fly differently — and none of them like a rifle bullet. PelletArc carries dedicated airgun drag laws (GA, GA2, WC0, SLG0, SLG1 and GS) sourced from wind-tunnel work, so a pellet is solved as a pellet instead of approximated with G1 or G7. More on pellet BC.
Box ballistic coefficients are a single number measured on someone else’s barrel. Log two or three observed drops and PelletArc fits a velocity-dependent BC curve to your rifle and pellet — your DOPE becomes the calibration. See how truing works or read what is BC truing.
One glowing holdover on a single, thumb-friendly screen — readable in direct sun, kind to night vision. No drilling through tabs at the firing line; conditions stay folded away until you need them.
Choose from the 1,680-pellet catalogue — each entry tagged by data quality so you know how far to trust its BC — or enter mass and BC by hand. Diabolo, wadcutter, slug and round ball are all covered, from .177 to big-bore.
Enter your zero range, sight height and target range, then add wind, atmosphere and incline when they matter. The barometer auto-fills pressure on supported devices; everything stays optional and folds away until you reach for it.
Get the answer in mil, MOA or centimetres — viewed as a trajectory chart, drawn on your reticle, or as a range table, one tap apart. Pro exports a PDF holdover / turret card for the bench and the truck.
Free solves at full accuracy to 35 m. See pricing for what Pro adds.
PelletArc ships airgun-specific drag models you won’t find in any other phone app — and the rimfire and rifle laws to back them up.
Provenance: Miles Morris (Ballisticboy), JBM Ballistics, McCoy/BRL, ChairGun — cited in-app. The airgun laws are Miles Morris’s original wind-tunnel work; no fabricated coefficients.
Switch the holdover unit anywhere; metric and imperial throughout. The number is the same solve, just in your language.
See the trajectory as a chart, drawn on one of 15 angular-correct reticles, or as a range table — one tap apart.
Pro exports a holdover / turret card to PDF — print it for the bench or share it to the truck, fully offline.
The free version solves at full accuracy out to 35 m — the limit is stated plainly, never hidden. Pro is about breadth and output, never accuracy.
One-time purchase. No subscription, no ads, no account. Profiles export as plain JSON — your data stays yours.
| Feature | Free | Pro |
|---|---|---|
| Full ballistic solver · all 9 drag laws | ✓ | ✓ |
| All reticles & the full pellet catalogue | ✓ | ✓ |
| Single-shot BC calibration | ✓ | ✓ |
| Range | to 35 m | Unlimited |
| Saved profiles | 1 | Unlimited |
| Multi-distance BC curve | — | ✓ |
| Holdover / turret card (PDF) | — | ✓ |
| Offline · no ads · no account | ✓ | ✓ |
The same engine, tuned for rimfire with the RA4 drag law and your own DOPE.
MethodWhy a box BC misleads, and how two or three drops fit a curve to your setup.
ComparisonA modern, airgun-first alternative to the classic ChairGun calculator.
See the full guides & glossary, or read up on mil vs MOA and the physics behind the solver.
iOS & Android · one-time purchase · works fully offline.
Launching on iOS & Android. Pay once — no subscription.