Calculate Gallons Per Minute

Sump/Sewage/Grinder GPM Calculation Worksheet

Use the tables below to calculate GPM required.

Use Table 3.5 (Step #1) to determine number of fixture units
Then use Table 3.6 (Step #2) to convert Fixture Units to GPM
Enter the GPM in the GPM box under “Design Flow Rate” on the Pump Design Guide.

Step #2:
Table 3.6: Conversions – Gallons Per Minute to Fixture Units
Flow (GPM)	Fixture Units (Flush Tank)	Fixture Units (Flush Tank)	Flow (GPM)	Fixture Units (Flush Tank)	Fixture Units (Flush Tank)	Flow (GPM)	Fixture Units (Flush Tank)	Fixture Units (Flush Tank)
1	0	–	45	107	37	145	611	521
2	1	–	46	111	39	150	638	559
3	3	–	47	115	42	155	665	596
4	4	–	48	119	44	160	692	631
5	6	–	49	123	46	165	719	666
6	7	–	50	127	48	170	748	700
7	8	–	51	130	50	175	778	739
8	10	–	52	135	52	180	809	775
9	12	–	53	141	54	185	840	811
10	13	–	54	146	57	190	874	850
11	15	–	55	151	60	200	945	831
12	16	–	56	155	63	210	1018	1009
13	18	–	57	160	66	220	1091	1091
14	20	–	58	165	69	230	1173	1173
15	21	–	59	170	73	240	1254	1254
16	23	–	60	175	76	250	1335	1335
17	24	–	62	185	82	260	1418	1418
18	26	–	64	195	88	270	1500	1500
19	28	–	66	205	95	280	1583	1583
20	30	–	68	215	102	290	1668	1668
21	32	–	70	225	108	300	1755	1775
22	34	5	72	236	116	310	1845	1845
23	36	6	74	245	124	320	1926	1926
24	39	7	76	254	132	330	2018	2018
25	42	8	78	264	140	340	2110	2110
26	44	9	80	275	148	350	2204	2204
27	46	10	82	284	158	360	2298	2298
28	49	11	84	294	168	370	2388	2388
29	51	12	86	305	176	380	2480	2480
30	54	13	88	315	186	390	2575	2575
31	56	14	90	326	195	400	2670	2670
32	58	15	92	337	205	410	2765	2765
33	60	16	94	348	214	420	2862	2862
34	63	18	96	359	223	430	2960	2960
35	66	20	98	370	234	440	3060	3060
36	69	21	100	380	245	450	3120	3150
37	74	23	105	406	270	500	3620	3620
38	78	25	110	431	295	550	4070	4070
39	83	26	115	455	329	600	4480	4480
40	86	28	120	479	365	700	5380	5380
41	90	30	125	506	396	800	6280	6280
42	95	31	130	533	430	900	7280	7280
43	99	33	135	559	460	1000	8300	8300
44	103	35	140	585	490