Calculadora WFT/DFT Herramientas de construcción
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Calculadora de cobertura de recubrimiento WFT/DFT

Calcula hacia atrás el espesor de película húmeda y el uso real del material a partir del espesor objetivo de película seca, los sólidos volumétricos, la merma y el área.

Cambia entre micras y mils mientras trabajas con etapas de recubrimiento industrial, incluidos los trabajos pesados.

Consulta DFT, WFT, cobertura teórica y uso en un solo lugar
Admite micras / mils y m²/L / ft²/gal
Incluye franjas de sellado y retoque

Cómo usarla

  1. Choose the unit system.
  2. Enter target DFT, volume solids, and coats for each stage.
  3. Add area, loss rate, and area share if needed.
  4. Review WFT, theoretical coverage, and actual usage.
  5. Copy the result or share the current state if needed.

Ejemplos

Two-stage heavy-duty coating (metric)

Entrada Area 100 m², loss rate 10%, Primer: DFT 75 µm, volume solids 80%, 1 coat, area share 100%, Topcoat: DFT 50 µm, volume solids 65%, 2 coats, area share 100%

Salida Primer WFT 93.75 µm, theoretical coverage 10.67 m²/L, usage 10.42 L. Topcoat WFT 76.92 µm, theoretical coverage 13.00 m²/L, usage 17.09 L. Total 27.51 L.

Partial coating with stripe coat (imperial)

Entrada Area 10,000 ft², loss rate 10%, Stripe coat: DFT 3 mil, volume solids 80%, 1 coat, area share 25%

Salida WFT 3.75 mil, theoretical coverage 427.78 ft²/gal, effective coverage 385.00 ft²/gal, actual usage 6.49 gal.

Fórmulas

  • WFT = DFT ÷ solidsFraction
  • Theoretical coverage = 1000 ÷ WFT(µm)
  • Theoretical coverage = 1604.1666667 ÷ WFT(mil)
  • Actual usage = Area × AreaShare × Coats × DFT ÷ (1000 × solidsFraction × (1 - lossRate))
  • Stage total DFT = DFT × Coats

Glosario

DFT

Dry film thickness left after curing. This is the main figure used in specifications and inspection criteria.

WFT

Wet film thickness immediately after application. Only the solids remain after drying.

Volume solids

The share of volume that remains as film. Use volume solids for thickness conversion.

Theoretical coverage

A no-loss coverage estimate derived from WFT.

Area share

The share of total area assigned to a stage, such as stripe coat or touch-up work.

Notas

  • Esta calculadora usa sólidos volumétricos, no sólidos en peso.
  • La merma es un modelo simplificado que varía con la pulverización, la retención de herramienta, el residuo del envase y las condiciones de obra.
  • La parte de área puede definirse por etapa. Funciona bien para franjas de sellado y retoques.
  • El uso real varía según el procedimiento del fabricante, el método de aplicación, la temperatura, la humedad y el estado del sustrato.

Preguntas frecuentes

What is the difference between WFT and DFT?

WFT is the film thickness right after application, while DFT is the film thickness left after drying. Volume solids are used to convert between them.

Are volume solids and weight solids the same?

No. Use volume solids for thickness conversion. If you only have weight solids, convert them separately first.

What loss rate should I enter?

Use a value that matches the application method, geometry, and your field experience. Higher overspray usually means a higher loss rate.

Can I use it without entering area?

Yes. Leave area blank if you only need the WFT and theoretical coverage calculation.

Can I mix metric and imperial units in one calculation?

No. Keep the entire calculation in one unit system at a time.