Environment Calculators
- Air Purifier Size CalculatorEnter your room size to find the clean air delivery rate (CADR) an air purifier needs to clean the room's air several times an hour.
- Haze API CheckerEnter the API reading for your area to see its category and what to do. Get today's reading from the Department of Environment, because it changes by the hour.
- Haze Cigarette EquivalentEnter the PM2.5 reading and the hours you spend outdoors to see roughly how many cigarettes that air equals. This is a rough comparison, not a medical measure.
- Heat Index CalculatorEnter the air temperature and relative humidity to see how hot it feels. Humid air makes the same temperature feel hotter because sweat evaporates more slowly.
- Air Purifier Clean-Up Time CalculatorEnter your room size, the purifier's CADR and the PM2.5 levels to estimate how long it takes to clean the room's air. This is an idealised estimate for a closed room.
- Solar Panel CalculatorEnter your monthly electricity use, the daily solar yield and the watts per panel to estimate the rooftop system size and number of panels you need.
- PM2.5 to US AQI CalculatorEnter a 24-hour PM2.5 reading in µg/m³ to get the US AQI and its category. Many air quality apps show this US number, which is not the same as Malaysia's API.