ULV Output Calculator

Ready to calculate

Enter sprayer settings and target dosage, then submit to see results here.

Inputs

Use the same units shown on each field. The tool provides raw and adjusted output values.

Nozzle flow rate (ml/min)

Per nozzle at your typical pressure.

Number of nozzles

Total nozzles spraying simultaneously.

Spray time (min)

Planned run time for the current task.

Solution concentration (%)

Used to estimate active ingredient equivalent.

Target dosage (ml/m²)

Desired application rate for your treatment plan.

Treatment area (m²)

Total area you intend to cover.

Loss factor (%)

Accounts for drift, bounce, evaporation, or overspray.

Calibration factor (%)

Adjust output if measured flow differs from label.

Reset

Example Data Table

Flow (ml/min)	Nozzles	Time (min)	Dosage (ml/m²)	Area (m²)	Loss (%)	Adj. Volume (L)	Rate (L/hr)
250	2	15	20	200	10	6.750	27.00
180	1	25	15	350	8	4.140	9.94
320	3	12	25	150	12	10.137	50.69

These examples show adjusted volume after the loss factor is applied, with calibration set to 0%.

Formula Used

Total flow (ml/min) = Nozzle flow × Number of nozzles
Raw volume (ml) = Total flow × Spray time
Adjusted volume (ml) = Raw volume × (1 + Calibration%) × (1 − Loss%)
Output rate (L/hr) = Adjusted volume (L) ÷ (Time (min) ÷ 60)
Required volume (ml) = Area (m²) × Target dosage (ml/m²)
Estimated time (min) = Required volume ÷ Total flow, corrected for loss and calibration
Coverage (m²) = Adjusted volume (ml) ÷ Target dosage (ml/m²)

Active ingredient equivalent is estimated as Adjusted volume × Concentration%.

How to Use This Calculator

Measure nozzle flow at operating pressure using a timed catch test.
Enter flow rate, number of nozzles, and the expected spray time.
Set target dosage and the area you plan to treat.
If conditions cause drift or overspray, add a realistic loss factor.
If real flow differs from label, set a calibration factor to match.
Press Calculate to see volume, rate, coverage, and time.
Use the export buttons to save a quick record for the site file.

Always follow your product label, local rules, and safety plan.

Calibrated output for consistent site coverage

ULV work succeeds when the applied volume matches the plan. Start with a catch test to confirm nozzle flow at the operating pressure, then use the calibration factor to align label flow with measured flow. When output is consistent, dosage targets become predictable across shifts and crews, reducing retreatment and chemical overuse.

Loss factor management in open construction zones

Drift and evaporation can be significant around scaffolds, facades, and windy corridors. The loss factor lets you model real-world reduction from overspray, bounce, and air movement. For sheltered interior zones you may use a lower loss value; for exposed exterior work, plan higher losses and adjust scheduling to calmer windows.

Dosage planning and treated-area forecasting

The calculator converts your dosage (ml/m²) and area (m²) into required volume, then estimates the time needed based on total flow. This supports crew planning: you can confirm whether a tank load finishes a zone, or whether a refill point is needed. Coverage output also helps you compare alternative dosage targets safely.

Example inputs that mirror common field checks

Example set A: 250 ml/min per nozzle, 2 nozzles, 15 minutes, 20 ml/m² dosage, 200 m² area, 10% loss. Example set B: 180 ml/min, 1 nozzle, 25 minutes, 15 ml/m², 350 m², 8% loss. These values are typical for quick verification runs before full production spraying.

Documentation and compliance-ready reporting

Exporting CSV and PDF creates a simple record of settings, adjusted output, and estimated treatment time. Keep these summaries with method statements, PPE controls, and product instructions. Consistent records support audits, improve handovers, and make it easier to justify changes when conditions or access constraints affect spraying performance.

FAQs

1) What does the calibration factor change?

It scales the calculated volume to match real flow. Use a positive value if measured output is higher than expected, or a negative value if measured output is lower.

2) Why include a loss factor?

It models drift, bounce, evaporation, and overspray. Using a realistic loss value improves the accuracy of adjusted volume, coverage, and time estimates.

3) Which result should I use for planning?

Use the adjusted sprayed volume and output rate for field planning because they account for calibration and losses. Raw volume is best for quick equipment comparisons.

4) How is “active ingredient equivalent” estimated?

It multiplies adjusted solution volume by the concentration percentage. It is a simple proxy for chemical fraction, not a substitute for label-based mixing rules.

5) What if I do not know my target dosage?

Start from the product instructions or the method statement for the task. Then run small-area trials to confirm coverage quality before scaling up.

6) Can I use this for multiple tanks or refills?

Yes. Run the calculator for each spray segment or tank load. Save a CSV/PDF per segment to keep clear records of changes in time or settings.

7) Does the tool replace safety and compliance checks?

No. It supports planning and documentation. Always follow product instructions, local regulations, ventilation requirements, and your site safety plan for ULV operations.