Airsoft Calculator CP West

A chrono and tuning calculator for airsoft replicas, from Checkpoint West. Everything is worked out on your phone - no account, no internet needed.

FPS AND JOULES
FPS to joules and back, the equivalent speed for every BB weight, and the approximate spring class. Speeds in FPS or m/s.

FIELD LIMITS AND MED
Tiered profiles with a minimum engagement distance. For sniper, DMR and pistol you enter your field's limits, and each class remembers its own.

CHRONO SESSION
Record your shots and see the average, min/max, spread and standard deviation. Send the average or the hottest shot to the calculator, with the weight it was fired with.

JOULE CREEP
Chrono with a light and a heavy BB and see whether your replica gains energy with the heavier one. The result feeds the "will I pass the chrono" check when the field measures with a different weight.

HPA
From one measurement: the pressure a limit needs, air use, and how many shots are left in the tank.

GAS
How power moves with temperature, from tables for green gas and CO2.

TRAJECTORY
The best hop-up setting for your energy, compared with under- and over-hop, with usable range and time to target. The model is checked against the Airsoft Trajectory Project's published ranges and applies between 0.5J and 5J.

MAINTENANCE
A log of the work done on each replica. Record the chrono after a repair and see whether power drops over time.

YOUR DATA STAYS YOURS
No ads, no analytics, no tracking. Setups, the log and the history are stored on your phone only. Export a report or a backup file with one tap, and restore the backup on another device.

In 13 languages, following your phone's: English, Bulgarian, German, Spanish, French, Italian, Polish, Portuguese, Russian, Turkish, Japanese, Korean and Chinese.

Values are approximate. Always chrono with the BB weight you actually play with, and follow your field's rules.