Tools you might need next
Estimate muzzle velocity from chamber pressure, bore volume, and projectile mass. Free ballistics muzzle velocity tool for ballistics, muzzle, and more.
Calculate bullet drop due to gravity at range for level firing. Free ballistics bullet drop tool for ballistics, bullet, and more.
Estimate lateral bullet drift from crosswind using time of flight and lag factor. Free ballistics wind drift tool for ballistics, wind, and more.
This tool applies a standard formula from the relevant domain. The computation is deterministic — given the same inputs, the result is always identical. The formula accounts for the primary variables that determine the output.
Drift ≈ 1.25 × (t² × twist direction factor)The calculation requires: Time of Flight, Twist Rate, Twist Direction (+1 RH, −1 LH). Each parameter contributes to the final result according to the formula above. Accuracy depends on the precision of your input measurements.
Updated: July 2026
A typical use case demonstrating the calculator with representative values.
→ Calculated result based on the formula and provided inputs
Enter your own values to get a personalized result for your specific situation.
→ Result calculated from your specific input values
Check the expected unit for each input field (shown as suffix). Converting between imperial and metric units before entering values prevents calculation errors.
When a formula combines multiple measurements, all inputs must use compatible units. Convert everything to the same system (metric or imperial) before calculating.
Estimate horizontal spin drift from barrel twist and time of flight. Free ballistics spin drift tool for ballistics, spin, and more. It applies the calculation formula (Drift ≈ 1.25 × (t² × twist direction factor)). For example: 0.8 s tof, 1:10 rh twist — A typical use case demonstrating the calculator with representative values.