Advanced Fumigation Volume Calculator

Calculator Form

Formula Used

1) Rectangular Chamber

V = L × W × H

2) Gable Roof Enclosure

V = (L × W × sidewall height) + (L × W × roof rise ÷ 2)

3) Cylinder or Silo

V = π × (D ÷ 2)² × H

4) Final Working Values

Gross Volume = Volume per chamber × Chamber count

Deduction Volume = Gross Volume × Obstruction %

Net Volume = Gross Volume − Deduction Volume

Adjusted Volume = Net Volume × (1 + Safety Margin %)

Gas Required (kg) = Adjusted Volume × Dosage Rate ÷ 1000

All dimensions are converted internally to meters, and all final gas calculations are based on cubic meters for consistency.

How to Use This Calculator

Choose the enclosure type that matches your fumigation area.

Select the measurement unit used on site.

Enter the structure dimensions, chamber count, and any roof rise if needed.

Add an obstruction percentage to subtract racks, machinery, or blocked space.

Add a safety margin if your work method requires extra allowance.

Enter the target dosage rate in grams per cubic meter.

Press Calculate Volume to show the result above the form.

Use the CSV or PDF buttons to export a clean report.

Example Data Table

Case	Type	Dimensions	Gross Volume (m³)	Deduction %	Adjusted Volume (m³)	Dosage Rate	Gas Required (kg)
Warehouse Room	Rectangular	12 × 8 × 4 m	384.00	5%	401.28	32 g/m³	12.84
Gable Shed	Gable Roof	20 × 10 × 4 m, roof rise 2 m	1000.00	8%	1030.40	28 g/m³	28.85
Four Silos	Cylinder	Diameter 3 m, height 6 m, count 4	169.65	3%	177.72	24 g/m³	4.27

FAQs

1) What is a fumigation volume calculator?

It estimates the enclosed air space that must be treated during fumigation. This helps plan chamber size, deductions, adjusted working volume, and approximate dosage requirement.

2) Why is gross volume different from net volume?

Gross volume is the full geometric enclosure size. Net volume removes space occupied by equipment, pallets, structural members, or other non-free areas inside the chamber.

3) When should I use the gable roof option?

Use it when the top section forms a roof peak above the sidewalls. The calculator adds the triangular roof space to the rectangular lower enclosure.

4) What does the safety margin do?

The safety margin increases the working volume after deductions. It is useful when your method requires an extra allowance for planning, leakage, or operational reserve.

5) Can I calculate multiple identical chambers at once?

Yes. Enter the number of identical chambers in the chamber count field. The calculator multiplies the single chamber volume before applying deductions and margins.

6) Which units can I enter?

You can enter meters, feet, centimeters, or inches. The calculator converts all dimensions internally to meters to keep the final volume and dosage consistent.

7) What is the dosage output based on?

The dosage output is based on the adjusted volume in cubic meters and the dosage rate entered in grams per cubic meter. The final value is shown in kilograms.

8) What do the CSV and PDF exports include?

They include the main calculated results and key summary values. This makes it easier to store field records, review assumptions, or share planning notes.