Restoration Industry Resources
Restoration Calculators
Field-ready engineering tools aligned to IICRC S500 guidance. Enter your loss parameters and let the math do the arguing. Designed for mobile — every input opens a numeric keypad.
Defaults
Applied across all calculators. Saved locally.Field Reference Guide
Not a restoration professional? Start here. Click any topic to learn what it means and why it matters before entering numbers into the calculators.
Air Mover Sizing
IICRC S500 Class 1–4 coverage. Compute how many air movers your loss footprint needs.
Floor
0 wet ft²1 air mover per 50–70 sq ft of wet floor
Ceiling
0 wet ft²1 air mover per 100–150 sq ft of wet ceiling
Walls
0 wet ft² (above 2 ft)1 air mover per 100–150 sq ft of wet wall above 2 ft
+1 air mover per qualifying inset or offset.
Dehumidifier Sizing
Size dehu load from cubic footage and Class of Loss. Match to real AHAM-rated units.
Factor 0.20 pints per ft³ per day
Psychrometrics
Confirm drying conditions: temperature, RH, dew point, GPP. Know if the structure is actually drying.
Magnus formula for dew point + Tetens for vapor pressure. Target a 30+ GPP differential between unaffected and affected areas for aggressive drying. Thirst shows remaining moisture capacity of the air; Depression is the dew-point spread.
Air Filtration & Abatement (ACH)
Size negative-air machines for a containment. IICRC S520 / ANSI Z9.5 air-change-per-hour targets.
Mold Containment — S520 ACH
Dedicated ACH calc for mold remediation containments. Typical targets: 4 ACH Level II, 6+ ACH Level III.
NAMs Required
- Containment volume
- —
- Required airflow
- —
- Target air changes
- 6 ACH
Per IICRC S520 / ANSI Z9.5. Final machine count depends on filter loading, duct runs, and make-up air. Verify with a smoke pencil after setup.
Drying Time Estimator
Rough drying-day estimate from floor area, Class of Loss, and installed dehu capacity. Useful for adjuster conversations.
Estimated Drying
- Required capacity
- —
- Capacity ratio
- —
- Baseline (this Class)
- 4 days
Estimate only. Real drying time depends on psychrometrics, containment, substrate moisture, and daily monitoring. Under-sized equipment stretches the curve disproportionately; extra capacity speeds things up only so far.
Loss / Claim Cost Range Estimator
Ballpark dollar range from area, Category, and Class. Not a quote — use to frame a conversation.
Ballpark Range
- Base rate (per ft²)
- $3.50
- Class multiplier
- 1.20×
- Midpoint
- —
NOT A QUOTE. Order-of-magnitude range to frame a conversation. Actual scope requires on-site inspection, moisture mapping, and contents handling. Reconstruction, asbestos/lead abatement, contents pack-out, and structural repairs are additive.
Heating / Cooling BTU
Rough BTU / Tons / Watts needed to bring a space from current to desired temperature. Accounts for insulation grade.
Power / Amperage
Add up drying equipment, see total amps and kW, and estimate run cost over a job.
Row draw: 4.2 A
Row draw: 4.2 A
Row draw: 4.2 A
Volume Conversions
Convert a volume-per-time reading across US, UK, and metric units. Handy for spec sheets and dehu output comparisons.
Enter a volume rate in any unit; get the equivalent in every other supported unit, per hour and per day. Useful for dehu output comparisons, extraction logs, and unit-mismatched spec sheets.
IICRC S500 Disclaimer
These calculators are simplified engineering aids derived from the ANSI/IICRC S500 Standard for Professional Water Damage Restoration and related air-quality guidance. They do not replace on-site assessment by a certified restoration professional. Actual equipment needs depend on psychrometric conditions, building materials, contamination category, containment, and airflow obstructions. Always defer to manufacturer specifications and the current IICRC standards. Reference the IICRC standards at iicrc.org.