Measure building volume, then size fumigant operations precisely. Track units, safety factors, and excluded areas. Export results to share with clients and inspectors easily.
| Zone | Length | Width | Height | Included? | Volume (m³) |
|---|---|---|---|---|---|
| Main Floor | 18 m | 10 m | 3 m | Yes | 540.0 |
| Attic Void | 18 m | 10 m | 1.2 m | Yes | 216.0 |
| Garage | 6 m | 6 m | 2.8 m | No | 0.0 |
| Gross Included Volume | 756.0 | ||||
Tip: add excluded volume for large unsealed cavities or blocked areas.
Vᵢ = Lᵢ × Wᵢ × Hᵢ
Each checked zone is treated as a rectangular prism.
Vgross = Σ Vᵢ
Sum all included zones to form total sealed-space volume.
Vnet = max(0, Vgross − Vexcluded)
Subtract optional excluded volume for blocked or unsealed space.
Vfinal = Vnet × (1 + (S + I)/100)
S = safety factor, I = irregularity factor.
Always confirm allowable methods, labels, and regulations before fumigation.
Accurate enclosure volume is the starting point for any fumigation plan. The calculator estimates the treated air space after subtracting known exclusions and then applying allowances. This supports cost estimating, staffing, and material staging. Results are shown in cubic meters and cubic feet for cross-checking notes. It does not replace product labels, regulatory limits, or a licensed applicator’s judgment.
Buildings rarely behave as a single box. Splitting the site into zones improves traceability and reduces missed spaces. Measure each zone’s length, width, and height using consistent reference points. If ceiling height varies, use an average based on multiple readings, or split the area into smaller zones. Include stairwells, soffits, and connected corridors when they are sealed. Unchecked zones remain documented but do not affect totals.
Excluded volume represents space that will not hold fumigant as intended, such as large unsealed cavities, blocked shafts, or areas isolated from the treatment envelope. Where possible, compute exclusions separately and enter them as a single value. Do not subtract small items like furniture; they typically displace little air compared with whole-room volume. Keep notes describing assumptions so estimators and crews can verify conditions during setup.
Two percentage factors help address real-world variability. The safety factor covers minor leakage paths, tarp seams, and measurement error. The irregularity factor covers complex geometry, beams, and partial partitions that reduce measurement certainty. Typical allowances may range from 5–15% each, depending on structure condition and sealing strategy. Use conservative values when access is limited, and reduce factors when drawings and field checks agree.
Exported reports support internal review and client communication. Share zone volumes, exclusions, and factors before mobilization to reduce rework. Pair the report with a sealing checklist and monitoring plan. Record final measurements, document any change orders, and keep the exported file with the job record for audits and closeout. Consistent documentation also improves estimating accuracy on repeat projects.
Use the final charge volume shown after exclusions and factors. Then follow the fumigant label, local regulations, and your licensed supervisor’s instructions to determine dosage and exposure time.
Create enough zones to match changes in layout or height. Separate floors, wings, attics, and stairwells when sealing differs. More zones improve auditability without increasing field effort too much.
Apply it for large cavities or areas that will not be sealed into the treatment envelope, such as isolated shafts or open voids. Avoid subtracting minor clutter or furniture, because the impact is usually negligible.
Start with 10% safety and 5% irregularity for typical work. Increase for poor access, aging structures, or complex geometry. Reduce when measurements are verified by drawings and a detailed field walkthrough.
Yes, but keep each run consistent. Choose your unit system for zone dimensions, and select the correct unit for any excluded volume. The report always provides both cubic meters and cubic feet for reference.
Unchecked zones are treated as excluded from the sealed envelope. Keeping them visible helps documentation and prevents omissions when you later remeasure or decide to include additional spaces.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.