Coatings, Inks & Specialty Chemical Production worked example

Letdown Ratio with letdown vehicle weight of 900 lb: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop letdown vehicle weight to 900 lb, then walk the calculation through step by step. Calculate letdown ratio from letdown vehicle weight, mill-base or concentrate weight, and any conversion basis.

The inputs for this scenario

  • Letdown vehicle weight: 900 lb (the input this scenario stresses; the baseline uses 1,800)
  • Mill-base or concentrate weight: 600 lb (held at the documented default)
  • Ratio conversion basis: 1 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Letdown Ratio = letdown vehicle weight ÷ mill-base or concentrate weight × ratio conversion basis.
  • base letdown ratio works out to 1.5 x at these inputs, and this is the headline figure for the scenario.
  • Raw ratio works out to 1.5 value at these inputs.
  • Conversion factor works out to 1 x at these inputs.
  • mill-base or concentrate weight works out to 600 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where letdown vehicle weight sits at 1,800 lb and the headline result is 3 x, this scenario comes in 50% below the baseline at 1.5 x.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to letdown vehicle weight, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It is a weight ratio only; it doesn't account for solids content or pigment loading differences between concentrates, so equal ratios can still yield different color strength.

Results at a glance

  • base letdown ratio: 1.5 x (headline result)
  • Raw ratio: 1.5 value
  • Conversion factor: 1 x
  • mill-base or concentrate weight: 600 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Letdown Ratio calculator, set letdown vehicle weight to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.