HOMEAIRQUALITYLAB.COM

Calculators

Quick indoor air quality planning tools: CADR sizing, ACH estimation, filter cost planning, and energy cost estimates.

CADR

CADR Sizer

Estimate a planning CADR from room size, ceiling height, and a target air changes per hour (ACH). This is a sizing estimate (not product-specific).

Room area Example: 200 sq ft or 20 m² Area unit Choose one Ceiling height Typical: 8 ft / 2.4 m Height unit Choose one Target ACH Planning target Open-plan factor Optional sizing buffer

Room volume

— ft³ (≈ — m³)

Estimated CADR

— cfm (≈ — m³/h)

CADR is an airflow-based sizing proxy. Real results vary with layout, leaks, and placement.

Room size & CADR calculators topic →

ACH

ACH Calculator

Estimate ACH from a given CADR and room size. Useful for sanity-checking sizing assumptions.

CADR (cfm) Planning CADR number Room area Area unit Ceiling height Height unit

Estimated ACH

— ACH

Room volume

— ft³ (≈ — m³)

This assumes CADR applies to that room volume and mixing is reasonable.

Air purifier sizing basics →

Filters

Filter Cost Planner

Estimate monthly and yearly filter costs from replacement price and interval. (Use your own prices; this tool doesn’t assume any brand.)

Replacement cost (per filter) Enter your local currency Replacement interval (months) Example: 3 / 6 / 12 Number of filters If you run multiple units Extra buffer Optional

Estimated monthly cost

—

Estimated yearly cost

—

Intervals depend on dust/smoke, fan speed, and sealing. Check filters regularly.

Maintenance & replacement guide →

Energy

Energy Cost Estimator

Estimate monthly energy use from watts and daily runtime. Helpful for “always-on” or sleep mode planning.

Power draw (W) Example: 10–60W depending on mode Hours per day Example: 8h/night or 24h/day Electricity price (per kWh) Enter your local price Days per month Simple estimate

Estimated monthly energy

— kWh

Estimated monthly cost

—

Real draw varies by fan speed, auto mode behavior, and filter loading.

Safety & standards overview →