Calculators

Indoor comfort calculators

Use room temperature, humidity, area, and dampness clues to get quick estimates. Inputs stay in the browser.

Digital hygrometer in a quiet room near a window

Indoor Dew Point Calculator

Calculate dew point from room temperature and relative humidity, then see what it means for comfort and window condensation.

Needs: room temperature and relative humidity.

Room Moisture Watch Calculator

Use humidity and dew point to flag room moisture conditions where dampness may linger around windows, walls, closets, or basements.

Needs: room temperature and relative humidity.

AC BTU Calculator for Room Size

Estimate room AC BTU from square feet, ceiling height, sun, people, and kitchen heat, with a room-size BTU chart and examples.

Needs: room area, ceiling height, sun, occupants, and kitchen heat.

Before using these calculators

Place the hygrometer away from vents, direct sun, damp towels, and exterior glass. Let it settle before reading, then repeat measurements in the same location when a pattern matters.

These calculators work best when you use measured room data instead of guesses. For repeated problems, compare the same room over several days and check nearby rooms before buying equipment.

Calculator results are planning estimates. They do not inspect hidden materials, approve equipment, or replace medical, HVAC, electrical, building, or safety guidance.