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.

Known value

Choose the value already on the plan, grade check, or layout note.

%
%

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.

Back to calculator
SlopeDecimalFall / ftFall / 10 ftFall / 100 ftAngleRise / run ratio
0.5%0.00500.060 in0.60 in6.0 in0.29°1:200
1.0%0.01000.120 in1.20 in1 ft0.57°1:100
1.5%0.01500.180 in1.80 in1 ft 6.0 in0.86°1:66.7
2.0%0.02000.240 in2.40 in2 ft1.15°1:50
2.5%0.02500.300 in3.00 in2 ft 6.0 in1.43°1:40
3.0%0.03000.360 in3.60 in3 ft1.72°1:33.3
3.5%0.03500.420 in4.20 in3 ft 6.0 in2.00°1:28.6
4.0%0.04000.480 in4.80 in4 ft2.29°1:25
4.5%0.04500.540 in5.40 in4 ft 6.0 in2.58°1:22.2
5.0%0.05000.600 in6.00 in5 ft2.86°1:20
5.5%0.05500.660 in6.60 in5 ft 6.0 in3.15°1:18.2
6.0%0.06000.720 in7.20 in6 ft3.43°1:16.7
6.5%0.06500.780 in7.80 in6 ft 6.0 in3.72°1:15.4
7.0%0.07000.840 in8.40 in7 ft4.00°1:14.3
7.5%0.07500.900 in9.00 in7 ft 6.0 in4.29°1:13.3
8.0%0.08000.960 in9.60 in8 ft4.57°1:12.5
8.5%0.08501.020 in10.20 in8 ft 6.0 in4.86°1:11.8
9.0%0.09001.080 in10.80 in9 ft5.14°1:11.1
9.5%0.09501.140 in11.40 in9 ft 6.0 in5.43°1:10.5
10.0%0.10001.200 in12.00 in10 ft5.71°1:10
10.5%0.10501.260 in12.60 in10 ft 6.0 in5.99°1:9.5
11.0%0.11001.320 in13.20 in11 ft6.28°1:9.1
11.5%0.11501.380 in13.80 in11 ft 6.0 in6.56°1:8.7
12.0%0.12001.440 in14.40 in12 ft6.84°1:8.3
12.5%0.12501.500 in15.00 in12 ft 6.0 in7.13°1:8
13.0%0.13001.560 in15.60 in13 ft7.41°1:7.7
13.5%0.13501.620 in16.20 in13 ft 6.0 in7.69°1:7.4
14.0%0.14001.680 in16.80 in14 ft7.97°1:7.1
14.5%0.14501.740 in17.40 in14 ft 6.0 in8.25°1:6.9
15.0%0.15001.800 in18.00 in15 ft8.53°1:6.7
15.5%0.15501.860 in18.60 in15 ft 6.0 in8.81°1:6.5
16.0%0.16001.920 in19.20 in16 ft9.09°1:6.3
16.5%0.16501.980 in19.80 in16 ft 6.0 in9.37°1:6.1
17.0%0.17002.040 in20.40 in17 ft9.65°1:5.9
17.5%0.17502.100 in21.00 in17 ft 6.0 in9.93°1:5.7
18.0%0.18002.160 in21.60 in18 ft10.20°1:5.6
18.5%0.18502.220 in22.20 in18 ft 6.0 in10.48°1:5.4
19.0%0.19002.280 in22.80 in19 ft10.76°1:5.3
19.5%0.19502.340 in23.40 in19 ft 6.0 in11.03°1:5.1
20.0%0.20002.400 in24.00 in20 ft11.31°1:5