Ballistic calculator for iPhone, iPad and Android

Range in.DOPE out.

Ballista turns your rifle, scope and load into DOPE you can trust, on your phone and on a card taped to your stock. Made for hunters, competitors and duty shooters. Works offline.

MOA or MILG1 · G7Out to 2,500 ydImperial or metric

Ballista's Shot screen at 437 yards: elevation UP 8.25 MOA, 33 clicks; wind RIGHT 2.00 MOA, 8 clicks

Live from the solver

Every yard,
in clicks.

Drag along the range. These are Ballista's own answers for a 6.5 Creedmoor elk rifle in a 10 mph wind from 3 o'clock, rounded to the turret's quarter-MOA clicks the way the app shows them.

437yd

ElevationMOA

Up 33clicks

8.25

WindMOA

Right 8clicks

2.00

Speed: 2,160 fps
Energy: 1,450 ft-lb
Time: 0.54 s

Bullet path held dead on with a 100 yd zero. Height is stretched so the drop shows.

Numbers exported from Ballista's engine for its demo rifle: 140 gr bullet, G7 0.326, 2,710 fps, 100 yd zero, 1/4 MOA clicks; 68°F, 28.60 inHg, 1,200 ft. This page does no math of its own. Solutions are estimates: confirm zero, velocity and conditions with live fire.

Big numbers view: UP 8.25 and RIGHT 2.00 in very large type

Shot

Your turret's clicks, in numbers you can read at arm's length

Elevation and wind in MOA or MIL, in your turret's clicks: UP 8.25 is 33 clicks.
Big numbers you can read in full sun, in red at night and with gloves on.
A wind clock with a bracket around your wind call, plus shot angle and density altitude.
Air from your iPhone's barometer, or tap Get Weather.
Velocity, energy and time of flight at the target, and where the bullet goes transonic.

Reticle

Which mark for which yard

200+ scope reticles from makers' specs, with your yards on each mark.
Or hold on a MIL or MOA grid with the ring on your target.
Each mark shows its distance in today's air, with the wind column beside it.

DOPE card ready to print: yards, UP MOA, clicks, wind and velocity from 50 to 500 yards

DOPE cards

A card that matches the screen, click for click

Nine formats, from a scope-cap strip and a click strip to a 3×5 card, large print and a full page.
Stage cards with your targets in order and three wind columns; Shoot it puts the whole stage on screen in big type.
A column for each place you shoot, and elevation at five temperatures.
Ballista tells you when the air no longer matches your card.

Themes

Noon sun to pre-dawn dark

Dark for most days, Sunlight for glare on the glass, and a red Night theme that keeps your eyes adjusted before first light.

8Dark 8Sunlight 8Night

The Shot screen split three ways: Sunlight, Dark and red Night

Always at hand

The rest of the kit

Lock Screen Live Activity: range 437 yd, UP 8.25, RIGHT 2.00, with minus 25 and plus 25 buttons — **Lock Screen**Your DOPE on the Lock Screen and in the Dynamic Island, with range buttons.

True your rifle: miss measured in inches, result adjusts muzzle velocity from 2,710 to 2,647 fps — **Truing**True velocity or BC from shots at up to three distances. After a miss, Ballista ranks the inputs most likely to blame.

3D trajectory: supersonic to 1,199 yards, drop 38.2 inches low at 437 yards — **3D path**A trajectory you can turn with a finger, with where the bullet stays supersonic.

Library of factory ammunition sorted by cartridge — **Library**500+ factory loads and 400+ bullets with makers' published BC and velocity.

Factory loads: 500+
Bullets: 400+
Scope reticles: 200+
Yards of solution: 2,500

Guides

The ballistics, worked out

Wind, drop, air and truing, explained with numbers solved by the same engine that runs in the app.

FoundationsHow a trajectory worksWhy a bullet crosses your line of sight twice but never rises, where the two crossings fall for a 100 and a 200 yard zero, and why changing the zero shifts every come-up by the same angle.FoundationsMIL vs MOAExact MIL and MOA conversions, why 1 MOA is not 1 inch at 100 yards, how to range with the mil-relation formula, and what each shortcut costs at 600 and 1,000 yards with a 6.5 Creedmoor.FoundationsG1 vs G7 BCFor a long boat-tail bullet the G1 BC that matches the real path holds steady above Mach 1.7 and then slides fast. Where a single G1 number starts to miss for a 6.5 Creedmoor and a .308, and by how much.FoundationsMuzzle velocity vs BCA 25 fps velocity error and a 5% BC error, solved side by side to 1,000 yards: where each one dominates, what your chronograph's SD does to vertical, and why truing at 600 yards can still miss at 1,000.FoundationsSight height and zeroA 1.5 vs 2.5 inch scope height and a 100 vs 200 yard zero, solved from 5 to 1,000 yards: big holds up close, a constant offset far away, and the sight height mistake that costs a click at 1,000.FoundationsBuilding a DOPE cardWhich columns a DOPE card needs, what step size costs if you read the nearest row, how far to print, and how far a card made at sea level goes wrong at 3,000, 6,000 and 9,000 feet of density altitude.

All guides

Under the hood

Checked, not guessed

A solver you can check

G1/G7, stepped BC, spin drift, aerodynamic jump and Coriolis, out to 2,500 yd. Checked against an independent open-source solver and makers' published tables. Tap any answer to see every input behind it.

Your location stays yours

Ballista never saves your location. Get Weather sends it to Apple Weather rounded to about 7 miles, only when you tap.

Made for the field

Works offline. Big type, gloved-hand controls, and a card on paper for when the phone stays in the pack.

Get Ballista

For iPhone and iPad with iOS 18 or later, and Android phones and tablets with Android 14 or later.