Question 1

What FPS is 1 joule on a 0.20g BB?

Accepted Answer

328 FPS. The formula: v = √(2E/m), converted to feet per second. On 0.20g (0.00020 kg), 1.0 J of energy equals 328 FPS.

Question 2

What's the max FPS for CQB with 0.20g BBs?

Accepted Answer

Most indoor CQB fields cap energy at 1.14 J, which is 350 FPS on a 0.20g BB. Always confirm with your field — some chrono everyone on 0.20g regardless of what you play with.

Question 3

Is 0.20g a good BB weight?

Accepted Answer

0.20g is a standard weight for stock and lightly upgraded AEGs. It's cheap and fast but drifts more in wind than heavier BBs.

Limit	Joules	Max FPS on 0.20g
Indoor CQB	1.14 J	350 FPS
Outdoor AEG	1.49 J	400 FPS
UK legal max (VCR Act)	1.32 J	377 FPS
Outdoor DMR	1.88 J	450 FPS
Bolt-action sniper	2.32 J	500 FPS

Velocity	Energy	Metric
100 FPS	0.09 J	30 m/s
120 FPS	0.13 J	37 m/s
140 FPS	0.18 J	43 m/s
160 FPS	0.24 J	49 m/s
180 FPS	0.30 J	55 m/s
200 FPS	0.37 J	61 m/s
220 FPS	0.45 J	67 m/s
240 FPS	0.54 J	73 m/s
260 FPS	0.63 J	79 m/s
280 FPS	0.73 J	85 m/s
300 FPS	0.84 J	91 m/s
320 FPS	0.95 J	98 m/s
340 FPS	1.07 J	104 m/s
360 FPS	1.20 J	110 m/s
380 FPS	1.34 J	116 m/s
400 FPS	1.49 J	122 m/s
420 FPS	1.64 J	128 m/s
440 FPS	1.80 J	134 m/s
460 FPS	1.97 J	140 m/s
480 FPS	2.14 J	146 m/s
500 FPS	2.32 J	152 m/s
520 FPS	2.51 J	158 m/s
540 FPS	2.71 J	165 m/s
560 FPS	2.91 J	171 m/s
580 FPS	3.13 J	177 m/s
600 FPS	3.34 J	183 m/s

FPS to Joules — 0.20g BB Chart

Field limits on 0.20g

Full conversion chart

FAQ

Other BB weights