Question 1

What FPS is 1 joule on a 0.30g BB?

Accepted Answer

268 FPS. The formula: v = √(2E/m), converted to feet per second. On 0.30g (0.00030 kg), 1.0 J of energy equals 268 FPS.

Question 2

What's the max FPS for CQB with 0.30g BBs?

Accepted Answer

Most indoor CQB fields cap energy at 1.14 J, which is 286 FPS on a 0.30g BB. Always confirm with your field — some chrono everyone on 0.20g regardless of what you play with.

Question 3

Is 0.30g a good BB weight?

Accepted Answer

0.30g is a popular all-round choice for upgraded AEGs — a good balance of trajectory stability and speed.

Limit	Joules	Max FPS on 0.30g
Indoor CQB	1.14 J	286 FPS
Outdoor AEG	1.49 J	327 FPS
UK legal max (VCR Act)	1.32 J	308 FPS
Outdoor DMR	1.88 J	367 FPS
Bolt-action sniper	2.32 J	408 FPS

Velocity	Energy	Metric
100 FPS	0.14 J	30 m/s
120 FPS	0.20 J	37 m/s
140 FPS	0.27 J	43 m/s
160 FPS	0.36 J	49 m/s
180 FPS	0.45 J	55 m/s
200 FPS	0.56 J	61 m/s
220 FPS	0.67 J	67 m/s
240 FPS	0.80 J	73 m/s
260 FPS	0.94 J	79 m/s
280 FPS	1.09 J	85 m/s
300 FPS	1.25 J	91 m/s
320 FPS	1.43 J	98 m/s
340 FPS	1.61 J	104 m/s
360 FPS	1.81 J	110 m/s
380 FPS	2.01 J	116 m/s
400 FPS	2.23 J	122 m/s
420 FPS	2.46 J	128 m/s
440 FPS	2.70 J	134 m/s
460 FPS	2.95 J	140 m/s
480 FPS	3.21 J	146 m/s
500 FPS	3.48 J	152 m/s
520 FPS	3.77 J	158 m/s
540 FPS	4.06 J	165 m/s
560 FPS	4.37 J	171 m/s
580 FPS	4.69 J	177 m/s
600 FPS	5.02 J	183 m/s

FPS to Joules — 0.30g BB Chart

Field limits on 0.30g

Full conversion chart

FAQ

Other BB weights