Spectra Precision HV101 - Gradient Conversion Chart

GRADIENT CONVERSION CHART
GL422N Only
Grade % Grade % Grade % Grade % Grade %
1:10 = 10.000 1:50 = 2.000 1:90 = 1.112 1:250 = 0.400 1:750 = 0.134
1:11 = 9.090 1:51 = 1.960 1:91 = 1.098 1:255 = 0.392 1:775 = 0.130
1:12 = 8.334 1:52 = 1.924 1:92 = 1.086 1:260 = 0.384 1:800 = 0.126
1:13 = 7.692 1:53 = 1.886 1:93 = 1.076 1:265 = 0.378 1:825 = 0.122
1:14 = 7.142 1:54 = 1.852 1:94 = 1.064 1:270 = 0.370 1:850 = 0.118
1:15 = 6.668 1:55 = 1.818 1:95 = 1.052 1:275 = 0.364 1:875 = 0.114
1:16 = 6.250 1:56 = 1.786 1:96 = 1.042 1:280 = 0.358 1:900 = 0.112
1:17 = 5.882 1:57 = 1.754 1:97 = 1.030 1:285 = 0.350 1:925 = 0.108
1:18 = 5.556 1:58 = 1.724 1:98 = 1.020 1:290 = 0.344 1:950 = 0.106
1:19 = 5.264 1:59 = 1.694 1:99 = 1.010 1:295 = 0.338 1:975 = 0.102
1:20 = 5.000 1:60 = 1.666 1:100 = 1.000 1:300 = 0.334 1:1000 = 0.100
1:21 = 4.762 1:61 = 1.640 1:105 = 0.952 1:310 = 0.332
1:22 = 4.546 1:62 = 1.612 1:110 = 0.910 1:320 = 0.312
1:23 = 4.348 1:63 = 1.588 1:115 = 0.870 1:330 = 0.304
1:24 = 4.166 1:64 = 1.562 1:120 = 0.834 1:340 = 0.294
1:25 = 4.000 1:65 = 1.538 1:125 = 0.800 1:350 = 0.286
1:26 = 3.846 1:66 = 1.516 1:130 = 0.770 1:360 = 0.278
1:27 = 3.704 1:67 = 1.492 1:135 = 0.740 1:370 = 0.270
1:28 = 3.572 1:68 = 1.470 1:140 = 0.714 1:380 = 0.264
1:29 = 3.448 1:69 = 1.450 1:145 = 0.690 1:390 = 0.256
1:30 = 3.334 1:70 = 1.428 1:150 = 0.666 1:400 = 0.250
1:31 = 3.226 1:71 = 1.408 1:155 = 0.646 1:410 = 0.244
1:32 = 3.126 1:72 = 1.388 1:160 = 0.626 1:420 = 0.238
1:33 = 3.030 1:73 = 1.370 1:165 = 0.606 1:430 = 0.232
1:34 = 2.942 1:74 = 1.352 1:170 = 0.588 1:440 = 0.228
1:35 = 2.858 1:75 = 1.334 1:175 = 0.572 1:450 = 0.222
1:36 = 2.778 1:76 = 1.316 1:180 = 0.556 1:460 = 0.218
1:37 = 2.702 1:77 = 1.298 1:185 = 0.540 1:470 = 0.212
1:38 = 2.632 1:78 = 1.282 1:190 = 0.526 1:480 = 0.208
1:39 = 2.564 1:79 = 1.266 1:195 = 0.512 1:490 = 0.204
1:40 = 2.500 1:80 = 1.250 1:200 = 0.500 1:500 = 0.200
1:41 = 2.438 1:81 = 1.234 1:205 = 0.488 1:525 = 0.190
1:42 = 2.380 1:82 = 1.220 1:210 = 0.476 1:550 = 0.182
1:43 = 2.326 1:83 = 1.204 1:215 = 0.466 1:575 = 0.174
1:44 = 2.272 1:84 = 1.190 1:220 = 0.454 1:600 = 0.166
1:45 = 2.222 1:85 = 1.176 1:225 = 0.444 1:625 = 0.160
1:46 = 2.174 1:86 = 1.162 1:230 = 0.434 1:650 = 0.154
1:47 = 2.128 1:87 = 1.150 1:235 = 0.426 1:675 = 0.148
1:48 = 2.084 1:88 = 1.136 1:240 = 0.416 1:700 = 0.142
1:49 = 2.040 1:89 = 1.124 1:245 = 0.408 1:725 = 0.138
Formula:
Distance in height x 100 = Percentage Grade
Distance
Example: Find 1 in 19.5
= 1 x 100 = 5.128%
19.5
19