Carpet Drying Time Estimator

Estimate carpet drying time based on carpet thickness, moisture saturation, room temperature, relative humidity, and airflow conditions.

Carpet Type Thicker carpets retain more moisture and take longer to dry.

Moisture Saturation Level (%) 10% = slightly damp, 100% = fully saturated (flooding).

Room Temperature (°F) Higher temperatures accelerate evaporation.

Relative Humidity (%) Lower humidity speeds up drying significantly.

Airflow Condition Airflow is the single biggest factor in drying speed.

Carpet Area (sq ft) (optional, for water volume estimate) Leave blank to skip water volume calculation.

Drying Time (hours) = 6 × C_carpet × M_factor × T_factor × H_factor × A_factor

6 hours — empirical baseline for medium-pile carpet at 80% saturation, 72°F, 50% RH, moderate airflow.
C_carpet — carpet type multiplier (1.0 low-pile → 2.5 thick/wool).
M_factor = moisture% / 80 — linear moisture scaling normalized to 80% saturation.
T_factor = 1 / (0.5 × 2^(T−50)/18) — evaporation rate doubles every 18°F above 50°F (Antoine equation approximation).
H_factor = 1 / (1 − RH/100)^0.6 — vapor pressure deficit model; drying slows as air approaches saturation.
A_factor — airflow multiplier (0.35 professional → 2.0 no airflow).
Water volume = 0.5 × C_carpet × Area (sq ft) × (moisture% / 100) gallons.

Baseline of 6 hours is derived from IICRC S500 Standard for Professional Water Damage Restoration guidelines for medium-pile carpet under controlled conditions.
Mold growth risk threshold of 24–48 hours is consistent with EPA and CDC guidance on indoor moisture and mold prevention.
The temperature evaporation model approximates the Clausius–Clapeyron / Antoine equation, where water vapor pressure roughly doubles every 18°F (10°C).
The humidity factor uses a vapor pressure deficit model: drying rate is proportional to (1 − RH/100), the fraction of air capacity still available to absorb moisture.
Water retention estimate of 0.5 gal/sq ft at 100% saturation is based on industry averages for carpet + pad systems (IICRC S500).
Results are estimates only. Actual drying times vary with subfloor type, carpet backing, padding, and HVAC system performance.
Professional water extraction (truck-mount or portable) can remove 80–90% of water before air drying begins, dramatically reducing total time.
References: IICRC S500 (2021), EPA "Mold and Moisture" guide, ASHRAE Fundamentals Handbook (psychrometrics chapter).

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