Why this calculator exists
Most of us don't keep a thermometer in every room, but we still ask the same questions. Is it really that warm in here? Has the AC been running long enough to make a difference? Should I open the windows or keep them shut?
Room Temperature Calculator gives you a quick, reasoned answer using things you already know: the weather outside and what's running inside.
What it does
You tell the calculator a few things about your room:
- The outdoor temperature, either detected from your location or typed in yourself
- Whether your windows are open or closed
- Whether the AC or heater is running, its set temperature, and how long it has been on
- Whether a fan is running
- Whether your room is small, medium, or large
It combines these into an estimated indoor temperature, a likely range, a comfort level, and a short "Why?" list that shows what pushed the estimate up or down.
How the estimate works
The estimator doesn't subtract a fixed number from the outdoor temperature. It works out a starting temperature, works out the temperature your room is heading toward, and then moves the room along that path for the amount of time the AC, heater, or fan has been running. The full explanation, including the limits of the approach, is on the Methodology page.
What it isn't
This is an estimate, not a measurement. It is a simplified model and doesn't know about your insulation, how much sun hits your room, humidity, how many people are inside, or what your building is made of. Treat the result as a reasonable ballpark. If you need an exact reading, use an indoor thermometer.
Who's behind it
Room Temperature Calculator is an independent project built and maintained by [Your name]. [Add a sentence or two about your background and why you built this tool.]
Principles
- Free to use. There are no accounts and no sign-up.
- Transparent. The result comes with reasons, and the method is documented in plain language.
- Honest about uncertainty. Every estimate shows a range and a confidence level.
- Respectful of privacy. Your location is used only to look up local weather. See the Privacy Policy.
Feedback
Found a result that looks wrong, or have an idea for a guide? Please get in touch.