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Dwell Window Coverage Calculator

How much area one batch treats inside its dwell window, and the throughput that window allows a crew.

Inputs

Range: 0.5–100 gal

Enter the measured quantity in the unit shown.

Range: 0.05–50

How much solution you put down per 1,000 sq ft. A pump sprayer wets more thinly than a mop, and a rough surface takes more than a smooth one.

Range: 1–180

From the product label. The window closes when the film starts to dry, not when the label time expires.

Result

Area treated by one batch
3,000 sq ft
Throughput at this dwell
36,000 sq ft/h
Batch windows per hour
12.0 batches
Solution applied per hour
36.0 gal
Reading: what this result means for the job
A high throughput figure, so plan the crew rather than the chemistry: at this rate one applicator cannot keep a batch workable on every pass, and the real limit is hands, not product.
Applicability limit
The area per batch follows the batch volume and the application rate entered, and the throughput figure is an upper bound: it assumes a batch is mixed and applied the instant the previous window opens. Travel, set-up, dwell waiting and removal all come out of it in a real building. This is a planning figure for the values entered, not a measured result. Coverage rates, product yields and application rates are properties of a specific product, applicator and substrate, and the label or data sheet for the product you are using always takes precedence over the default here.
Check before the job

Working

Area treated by one batch
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Batch windows per hour
—
Solution applied per hour
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Throughput at this dwell
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What to check

  • Check the dwell time on the product label rather than on a training slide.
  • Measure the application rate with the sprayer or mop the crew will use.
  • Watch for the film starting to dry before the stated dwell expires, especially in a warm room.

Related calculators

The dwell window is the interval before the film dries, and the throughput figure is an upper bound: it assumes a batch is mixed and applied the instant the previous window opens. Travel, set-up and removal all come out of it in a real building.