Calculators & Quantities
Slope and Fall Calculator
Fall calculation converts a slope and distance into a change in elevation. It does not decide which slope the project requires. For example, 300 metres at 1 in 5,000 gives a geometric fall of 60 millimetres.
Work through the numbers
Plan the surface handover
BeforeChoose the measurement direction and confirm the units.
Work stageCalculate fall as distance divided by the ratio denominator, or distance multiplied by slope percentage divided by 100.
AfterCompare planned end levels and intermediate checks with the design.
What to verify
Check millimetres versus metres and whether the entered distance is horizontal.
State every assumption and keep the quantity basis consistent. Use measured geometry where available, and label estimated depths, load factors and cycle times as estimates. Reconcile the calculation with observations before making a procurement or programme commitment.
Scope and limits
The example is geometry only, not an irrigation or drainage design recommendation.
Continue the job brief
Include the location, existing condition, intended surface, material, available tractor and proposed dates.