Choose the right purifier size
Calculate CADR before buying so the purifier matches your bedroom, office or living room.
Free air quality calculators
Air quality tools for cleaner, safer decisions.
Calculate purifier size, understand PM2.5 exposure, and turn AQI into practical health guidance for your home, commute and city.
Popular tools
Calculators built around real air pollution decisions.
CADR Calculator
Air Purifier Calculator
Find the right CADR, ACH, HEPA filter level and purifier category based on room size, AQI, pets, smoking and allergies.
Best for choosing a purifier
Open toolPM2.5 ExposureAQI to Cigarette Calculator
Convert PM2.5 into estimated cigarette equivalents per day, week, month, year and selected years in a city.
Best for visualizing pollution
Open toolPersonal RiskAQI Health Checker
Get an air-health score based on your city, age, time outdoors, mask use and indoor air protection habits.
Best for daily decisions
Open toolWhat you can do
From numbers to clear next steps.
AQI, PM2.5 and CADR can feel technical. These tools translate them into decisions: what purifier to buy, whether to wear a mask, and how serious today's pollution exposure may be.
Understand PM2.5 exposure
Turn abstract pollution numbers into a simple cigarette-equivalent comparison.
Plan outdoor activity
Use AQI health guidance to decide when to mask, reduce exertion or stay indoors.
Compare city pollution days
Use consistent calculators for Delhi, Mumbai, Bengaluru, Kolkata and other Indian cities.
Buying hub
Compare air purifiers
Browse AQIRadar's air purifier guide, editor picks, comparison table and buying advice.
Learning center
Read plain-language AQI explainers
Go deeper on PM2.5, AQI categories, harmful pollution levels, masks, purifiers and practical protection during high-pollution days.
FAQ
Air quality tool questions
Which AQIRadar tool should I use first?
If you are buying a purifier, start with the Air Purifier Calculator. If you want to understand pollution exposure, use the AQI to Cigarette Calculator. For daily personal guidance, use the AQI Health Checker.
Are these air quality calculators free?
Yes. AQIRadar tools are free educational calculators built to help people understand AQI, PM2.5 exposure, CADR and practical protection choices.
Can these tools replace medical advice?
No. The tools are educational and decision-support resources. People with asthma, COPD, heart disease, pregnancy or severe symptoms should follow medical guidance.
Do the calculators work for Indian cities?
Yes. The tools are designed for Indian air pollution use cases such as winter smog, high PM2.5, purifier sizing, masks and city-level AQI decisions.