Ballistics Solver

Compute a G1 or G7 trajectory: drop, windage, velocity, energy, and time of flight, corrected for your atmosphere, spin drift, and Coriolis. Everything runs in your browser; nothing you type here is uploaded or stored.

Inputs

Create a free account and your rifles, configurations, and chronographed velocities appear here, ready to fill the solver in two clicks.

Bullet diameter Bullet Firearm Configuration

Drag model

Ballistic coefficient BC reference Bullet weight (gr)

Bullet diameter (in)

in mm

Bullet length (in, optional)

Muzzle velocity (fps, measured at °F)

Sight height (in) Twist rate (in/turn) Twist direction Turret clicks

Zero range (yd) Enter conditions at the time of zero

Incline when zeroing (°, + uphill)

Wind when zeroing (mph)

from

Vertical wind when zeroing (mph, + up) Temperature when zeroing (°F) Humidity when zeroing (%) Pressure when zeroing (inHg) Zero pressure type Elevation when zeroing (ft)

Direction

Speed (mph)

Single Range

Vertical speed (mph, + up)

Single Range

Temperature (°F) Humidity (%) Pressure (inHg) Pressure type Elevation (ft)

Range (yd)

Step (yd)

Columns

Drop (in/cm) Drop (MOA/mrad) Elevation dial Windage dial Wind (in/cm) Wind (MOA/mrad) Velocity Energy Time Mach

Range units Drop & drift units Angular units

Shapes the on-screen table only; the printed card has its own columns on the DOPE Card page.

Chart units

Incline (°, + uphill) Coriolis / Eötvös Latitude (°, + north) Azimuth (° from north)

Sierra-style bands override the single coefficient in Projectile. Highest band first; the slowest band extends to zero.

The muzzle velocity's own measured-at temperature (in Rifle) is the anchor. Add chronographed velocities at other air temperatures and the solver interpolates your measurements; the linear sensitivity below applies only without them.

Measured velocities (°F, fps)

Sensitivity (fps/°F) Powder temp (°F, blank = air)

Enter a drop you actually observed and reconcile the solution: the ballistic coefficient or velocity while supersonic, transonic drag beyond that.

Observed at (yd)

Observed drop (+ = below aim)

Reconcile

Transonic drag factor applied.

dimeshooters

Design the card