Calculate your hold.
Don't guess it.
Drop, wind, spin drift, Coriolis and shot angle — solved on your phone, at the firing line, with no signal.
Everything you need to put the first round on steel
The full trajectory
Drop, drift, retained velocity, energy and time of flight at every distance you ask for.
Wind by clock position
Enter speed and the hour hand it comes from. Head and tail components are handled too.
The corrections that bite
Spin drift, Coriolis, shot angle, rifle cant and powder temperature — each one switchable.
A DOPE card you can share
Turn a solution into a clean range card, save it and send it to the phone in your pocket.
1,600+ factory loads
G1 and G7 coefficients, weight, calibre and muzzle velocity — plus your own handloads.
Rifle profiles
Zero distance, scope height, twist rate and click value, saved per rifle and reused everywhere.
Field tools
Reticle ranging, clinometer and compass, so a solution never waits on kit you left at home.
A training journal
Log groups, cold-bore shots, stage times and hit factor, then watch the trend instead of guessing.
Three inputs, one honest answer
Describe the rifle once
Zero distance, scope height above the bore, barrel twist and what one click of your turret is worth. Saved as a profile you never have to type again.
Pick the load
Search 1,600+ factory loads for the ballistic coefficient and muzzle velocity, or enter your own handload. Chronograph numbers beat catalogue numbers every time.
Read the hold
Distance, wind and conditions in; elevation and windage out, in MIL, MOA or clicks — with the reticle view showing where that lands on your own crosshair.
Real screens, real numbers
A calculator is only as good as the shooter reading it
Every article here is free and needs no download. Read it in the truck, apply it on the bench.
The theory, in plain language
Ballistic coefficient, G1 against G7, MOA against MIL, density altitude, spin drift, the transonic wall. Fifteen articles that explain what the numbers on the screen actually mean.
Read →TrainingDrills worth the ammunition
Eight structured range drills with a scoring method and a pass mark — cold bore, group ladders, wind calling, positional PRS stages and hit factor work.
Read →GuidesHow to drive the app
Eleven walkthroughs: build a rifle profile, pick a load, produce a DOPE card, range with your reticle, log a session, true your solution to reality.
Read →Reference1,600+ loads, one page each
G1 and G7 coefficients, bullet weight, calibre, muzzle velocity, muzzle energy, sectional density and form factor — browsable by manufacturer and by calibre.
Read →What you are actually installing
One version. Nothing locked.
- Every correction, every screen, every export — no paid tier exists.
- No account, no sign-up, no cloud sync. Your data stays on the phone.
- Works with the radio off; the weather lookup is the only optional online part.
- Interface in 12 languages, metric or imperial throughout.
Output is a prediction from the numbers you type in. Confirm it on paper at distance before you trust it on an animal or a match stage.
Questions people actually ask
Is the app really free? +
Yes. Every feature is free: the solver, the ammunition database, rifle profiles, the reticle view, the DOPE card, the training journal and the field tools. There is no subscription and no in-app purchase. A single banner ad at the bottom of the screen pays for it.
Does it work without a signal? +
The solver, the database and your profiles are on the phone, so the app calculates with the radio off. Only the optional weather lookup needs a connection; you can always type conditions in by hand.
Which drag model should I use, G1 or G7? +
G7 for modern boat-tail match bullets, G1 for flat-base and most hunting bullets. The app carries both coefficients for the loads that publish both, and the difference matters most past 600 m.
How accurate is it? +
The solver integrates a point-mass trajectory with Runge-Kutta 4 against the ICAO G1 and G7 drag tables, so the maths is the same class as any commercial solution. Accuracy in the field depends on your inputs: real muzzle velocity, real scope height and a confirmed zero. Truing closes the rest of the gap.
Does it collect my data? +
Profiles, loads and sessions stay in the app's own storage on your phone. There is no account and no sync. Android's own backup can copy that storage to your Google Drive if you leave backup on.
Is there an iPhone version? +
Not today. The app is Android only.
Put it in your range bag
Ballistic Calculator is free, runs offline and uses the same point-mass solver on every screen above. Android, 12 languages.