Field tools
Manual grade calculator.
Enter the horizontal run plus one known value. Read the grade, fall, angle, and ratio without leaving the field workflow.
Two values are enough
Run plus one known value
ft
ft
Use the horizontal distance, not the sloped pipe length.
%
%
Positive means downhill fall. Use a negative value for an uphill rise.
Calculation note
Grade % = vertical fall ÷ horizontal run × 100. This is a field check, not survey-grade verification; confirm final work against approved plans and project controls.
Quick slope reference
0.5% through 20.0% at a glance.
All values are calculated from the displayed grade. Scroll the table sideways on a phone; the slope column stays visible.
| Slope | Decimal | Fall / ft | Fall / 10 ft | Fall / 100 ft | Angle | Rise / run ratio |
|---|---|---|---|---|---|---|
| 0.5% | 0.0050 | 0.060 in | 0.60 in | 6.0 in | 0.29° | 1:200 |
| 1.0% | 0.0100 | 0.120 in | 1.20 in | 1 ft | 0.57° | 1:100 |
| 1.5% | 0.0150 | 0.180 in | 1.80 in | 1 ft 6.0 in | 0.86° | 1:66.7 |
| 2.0% | 0.0200 | 0.240 in | 2.40 in | 2 ft | 1.15° | 1:50 |
| 2.5% | 0.0250 | 0.300 in | 3.00 in | 2 ft 6.0 in | 1.43° | 1:40 |
| 3.0% | 0.0300 | 0.360 in | 3.60 in | 3 ft | 1.72° | 1:33.3 |
| 3.5% | 0.0350 | 0.420 in | 4.20 in | 3 ft 6.0 in | 2.00° | 1:28.6 |
| 4.0% | 0.0400 | 0.480 in | 4.80 in | 4 ft | 2.29° | 1:25 |
| 4.5% | 0.0450 | 0.540 in | 5.40 in | 4 ft 6.0 in | 2.58° | 1:22.2 |
| 5.0% | 0.0500 | 0.600 in | 6.00 in | 5 ft | 2.86° | 1:20 |
| 5.5% | 0.0550 | 0.660 in | 6.60 in | 5 ft 6.0 in | 3.15° | 1:18.2 |
| 6.0% | 0.0600 | 0.720 in | 7.20 in | 6 ft | 3.43° | 1:16.7 |
| 6.5% | 0.0650 | 0.780 in | 7.80 in | 6 ft 6.0 in | 3.72° | 1:15.4 |
| 7.0% | 0.0700 | 0.840 in | 8.40 in | 7 ft | 4.00° | 1:14.3 |
| 7.5% | 0.0750 | 0.900 in | 9.00 in | 7 ft 6.0 in | 4.29° | 1:13.3 |
| 8.0% | 0.0800 | 0.960 in | 9.60 in | 8 ft | 4.57° | 1:12.5 |
| 8.5% | 0.0850 | 1.020 in | 10.20 in | 8 ft 6.0 in | 4.86° | 1:11.8 |
| 9.0% | 0.0900 | 1.080 in | 10.80 in | 9 ft | 5.14° | 1:11.1 |
| 9.5% | 0.0950 | 1.140 in | 11.40 in | 9 ft 6.0 in | 5.43° | 1:10.5 |
| 10.0% | 0.1000 | 1.200 in | 12.00 in | 10 ft | 5.71° | 1:10 |
| 10.5% | 0.1050 | 1.260 in | 12.60 in | 10 ft 6.0 in | 5.99° | 1:9.5 |
| 11.0% | 0.1100 | 1.320 in | 13.20 in | 11 ft | 6.28° | 1:9.1 |
| 11.5% | 0.1150 | 1.380 in | 13.80 in | 11 ft 6.0 in | 6.56° | 1:8.7 |
| 12.0% | 0.1200 | 1.440 in | 14.40 in | 12 ft | 6.84° | 1:8.3 |
| 12.5% | 0.1250 | 1.500 in | 15.00 in | 12 ft 6.0 in | 7.13° | 1:8 |
| 13.0% | 0.1300 | 1.560 in | 15.60 in | 13 ft | 7.41° | 1:7.7 |
| 13.5% | 0.1350 | 1.620 in | 16.20 in | 13 ft 6.0 in | 7.69° | 1:7.4 |
| 14.0% | 0.1400 | 1.680 in | 16.80 in | 14 ft | 7.97° | 1:7.1 |
| 14.5% | 0.1450 | 1.740 in | 17.40 in | 14 ft 6.0 in | 8.25° | 1:6.9 |
| 15.0% | 0.1500 | 1.800 in | 18.00 in | 15 ft | 8.53° | 1:6.7 |
| 15.5% | 0.1550 | 1.860 in | 18.60 in | 15 ft 6.0 in | 8.81° | 1:6.5 |
| 16.0% | 0.1600 | 1.920 in | 19.20 in | 16 ft | 9.09° | 1:6.3 |
| 16.5% | 0.1650 | 1.980 in | 19.80 in | 16 ft 6.0 in | 9.37° | 1:6.1 |
| 17.0% | 0.1700 | 2.040 in | 20.40 in | 17 ft | 9.65° | 1:5.9 |
| 17.5% | 0.1750 | 2.100 in | 21.00 in | 17 ft 6.0 in | 9.93° | 1:5.7 |
| 18.0% | 0.1800 | 2.160 in | 21.60 in | 18 ft | 10.20° | 1:5.6 |
| 18.5% | 0.1850 | 2.220 in | 22.20 in | 18 ft 6.0 in | 10.48° | 1:5.4 |
| 19.0% | 0.1900 | 2.280 in | 22.80 in | 19 ft | 10.76° | 1:5.3 |
| 19.5% | 0.1950 | 2.340 in | 23.40 in | 19 ft 6.0 in | 11.03° | 1:5.1 |
| 20.0% | 0.2000 | 2.400 in | 24.00 in | 20 ft | 11.31° | 1:5 |