Calculators for where you are on the planet, what the sky is doing there, and what energy costs you — moist-air physics, solar output, dwelling heat loss, and what an electric car actually costs per mile.
What a charge costs and how long it really takes, with the power taper that makes the last 20% the slow 20% — then cost per mile against petrol.
Design heat loss in kW from U-values and ventilation — and how much bigger the radiators must be at a heat pump’s flow temperature.
Humidity, dew point, wet-bulb, and the full moist-air state — with a draggable psychrometric chart and a city climate atlas.
Wind chill and heat index from the official NWS formulas — the real "feels like" temperature, with frostbite and heat-risk categories.
What time is it there — and when does a meeting in one city land in another? Compare cities side by side across the day.
Annualised output for a solar array — pick a city, system size, panel tilt and orientation, and see month-by-month generation.
Sunrise, sunset, day length and twilight — plus the moon phase and illumination — for any city and date.
What your appliances actually cost to run. Add common or custom appliances, pick a country, and see the cost per day, week, month or year — plus CO₂.
Pressure, temperature, oxygen and force from the stratosphere to the ocean floor — jump to Everest, cruising altitude, the Titanic wreck or the Challenger Deep.