---
title: Calculate Gallons Per Minute | STH Inc.
description: "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"
---

# CALCULATE GALLONS PER MINUTE

**Sump/Sewage/Grinder GPM Calculation Worksheet**

Use the tables below to calculate GPM required.

1. Use Table 3.5 (Step #1) to determine number of fixture units
2. Then use Table 3.6 (Step #2) to convert Fixture Units to GPM
3. 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 |   |   |   |