Question 1

What FPS is 1 joule on a 0.28g BB?

Accepted Answer

277 FPS. The formula: v = √(2E/m), converted to feet per second. On 0.28g (0.00028 kg), 1.0 J of energy equals 277 FPS.

Question 2

What's the max FPS for CQB with 0.28g BBs?

Accepted Answer

Most indoor CQB fields cap energy at 1.14 J, which is 296 FPS on a 0.28g BB. Always confirm with your field — some chrono everyone on 0.20g regardless of what you play with.

Question 3

Is 0.28g a good BB weight?

Accepted Answer

0.28g is a popular all-round choice for upgraded AEGs — a good balance of trajectory stability and speed.

Limit	Joules	Max FPS on 0.28g
Indoor CQB	1.14 J	296 FPS
Outdoor AEG	1.49 J	338 FPS
UK legal max (VCR Act)	1.32 J	319 FPS
Outdoor DMR	1.88 J	380 FPS
Bolt-action sniper	2.32 J	422 FPS

Velocity	Energy	Metric
100 FPS	0.13 J	30 m/s
120 FPS	0.19 J	37 m/s
140 FPS	0.25 J	43 m/s
160 FPS	0.33 J	49 m/s
180 FPS	0.42 J	55 m/s
200 FPS	0.52 J	61 m/s
220 FPS	0.63 J	67 m/s
240 FPS	0.75 J	73 m/s
260 FPS	0.88 J	79 m/s
280 FPS	1.02 J	85 m/s
300 FPS	1.17 J	91 m/s
320 FPS	1.33 J	98 m/s
340 FPS	1.50 J	104 m/s
360 FPS	1.69 J	110 m/s
380 FPS	1.88 J	116 m/s
400 FPS	2.08 J	122 m/s
420 FPS	2.29 J	128 m/s
440 FPS	2.52 J	134 m/s
460 FPS	2.75 J	140 m/s
480 FPS	3.00 J	146 m/s
500 FPS	3.25 J	152 m/s
520 FPS	3.52 J	158 m/s
540 FPS	3.79 J	165 m/s
560 FPS	4.08 J	171 m/s
580 FPS	4.38 J	177 m/s
600 FPS	4.68 J	183 m/s

FPS to Joules — 0.28g BB Chart

Field limits on 0.28g

Full conversion chart

FAQ

Other BB weights