NR_Noise_Rating_Calculation

	A	B	C	D	E	F	G	H	I	J
1	Use “File > Make Copy” to make your own copy!
2
3	NR - Noise Rating Calculation
4	For more info:
5	http://www.engineeringtoolbox.com/nr-noise-rating-d_60.html
6	If you are signed into your Google Account - select "File > Make a copy" to make your own copy to modify!!
7
8		Octave Band Center Frequency (Hz)
9		31.25	62.5	125	250	500	1000	2000	4000	8000
10	NR 130	144	138	135	133	131	130	128	127	126
11	NR 120	137	130	126	124	122	120	118	117	116
12	NR 110	130	122	118	114	112	110	108	107	105
13	NR 100	124	115	109	105	102	100	98	96	95
14	NR 90	117	107	100	96	93	90	88	86	85
15	NR 80	110	99	92	86	83	80	78	76	74
16	NR 70	103	91	83	77	73	70	68	66	64
17	NR 60	96	83	74	68	63	60	57	55	54
18	NR 50	89	75	66	59	54	50	47	45	44
19	NR 40	83	67	57	49	44	40	37	35	33
20	NR 30	76	59	48	40	34	30	27	25	23
21	NR 20	69	51	39	31	24	20	17	14	13
22	NR 10	62	43	31	21	15	10	7	4	2
23	NR 0	55	36	22	12	5	0	-4	-6	-8
24	measured or estimated values	40	40	50	55	60	50	55	45	45
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