Inputs
Example data table
These sample values show how inputs affect drop, velocity, and energy.
| Example | Inputs | Outputs (at target range) |
|---|---|---|
| A |
150 gr, 2800 ft/s, BC 0.435 Zero 100 yd, Sight 1.5 in Target 300 yd, Step 50 yd |
Drop ≈ 13.8 in, Energy ≈ 1810 ft·lbf Velocity ≈ 2330 ft/s, Time ≈ 0.37 s |
| B |
124 gr, 1150 ft/s, BC 0.165 Zero 25 yd, Sight 1.2 in Target 100 yd, Step 25 yd |
Drop ≈ 6.9 in, Energy ≈ 270 ft·lbf Velocity ≈ 990 ft/s, Time ≈ 0.28 s |
| C |
10.0 g, 820 m/s, Cd 0.30, 7.82 mm Zero 100 m, Sight 4.0 cm Target 400 m, Step 50 m |
Drop ≈ 79 cm, Energy ≈ 1880 J Velocity ≈ 610 m/s, Time ≈ 0.61 s |
Examples are illustrative, and results vary by model choices.
Formula used
Impact energy
Kinetic energy at a given range:
E = ½ · m · v²
Where m is mass and v is speed at that point.
Gravity and drop
Vertical acceleration always includes gravity:
ay = −g − adrag·(vy/v)
Drop is reported relative to the sightline after applying your zero range.
Drag
Two options are provided:
- Cd + diameter (physics): adrag = ½·ρ·Cd·A·v² / m
- G1 BC (simplified): uses an empirical deceleration scaled by air density.
Both are approximations; real drag varies with speed and shape.
How to use this calculator
- Choose a unit system that matches your data.
- Enter bullet weight and muzzle velocity from reliable sources.
- Select a drag model, then fill BC or Cd/diameter fields.
- Set sight height and zero range to match your setup.
- Enter the target range and a step size for the table.
- Optionally adjust atmosphere and wind for realism.
- Press Calculate, then export CSV or PDF.