About Ballistic Calculator
A free set of ballistics calculators built for shooters who want fast, readable answers without wading through adverts or sign-up walls.
The flight model
Bullet flight is solved as a point mass stepped forward in small time increments. At each step the solver looks up drag deceleration from the standard G1 retardation curve, scaled by your ballistic coefficient, and applies gravity. The launch angle is found by iterating until the bullet crosses the line of sight at your chosen zero range, measured from your scope height above the bore.
Drag functions
Every drag family has its own measured drag-coefficient table (Cd against Mach number), and the integrator uses the table your ballistic coefficient was published against. A G7 coefficient is solved on the real G7 curve, a G1 coefficient on the G1 curve, and nothing is converted between them. Enter the number your bullet maker published and set the matching model.
Atmosphere and wind
Altitude, temperature, barometric pressure and humidity are combined into an air density, and the ratio against standard sea-level density scales the effective ballistic coefficient. Thin, warm, high air means less drag and a flatter curve. Crosswind deflection comes from the bullet's lag time — the difference between actual time of flight and flight in a vacuum — with the wind angle splitting the wind into cross and head components.
Limits
No calculator replaces range time. Spin drift, Coriolis, aerodynamic jump, and lot-to-lot velocity variation are not modelled. Feed the solver measured velocity from a chronograph and a trustworthy coefficient, then verify your drops at distance before hunting or competing on them.