Understand the representation

Slope guides with definitions and precision visible

Three guides explain representations, horizontal run, signs, exact unit factors, rounding, and measurement limits.

Representations5 min read

Slope percent, degrees, per mille, and 1:N are related—not interchangeable

Connect rise over horizontal run to every common slope notation and avoid treating 45° as 45%.

Geometry5 min read

Identify the right-triangle side required by rise/run before entering a tape measurement taken along the incline.

Precision5 min read

Separate exact decimal arithmetic from approximate trigonometry and from uncertainty in the measurements themselves.