AR-Platform Tools & Calculators
Free, instant, no sign-up. The same formulas that decide every Datum Grade on this site, with the reference conditions printed under each one so you can reproduce the figure — or move it onto your own rifle.
Recoil Energy Calculator
Free recoil energy, velocity and impulse at your stated rifle weight and load — then any advertised reduction percentage re-derived both ways it could have been measured.
Open toolTwist Rate & Stability Factor
Miller stability factor from projectile length, twist, velocity, temperature and altitude — the two variables grain-weight twist charts cannot see.
Open toolSight Adjustment, Subtension & Offset
Turn a group offset into turret clicks, MOA and MRAD, see what your dot actually covers, and get the mechanical offset your zero implies up close.
Open tool