Weather, earth and fun calculators
Moon phase, wind chill and heat index, altitude and air pressure, carbon footprint, rainwater harvesting, and star-sign and numerology tools labelled as entertainment.
7 calculators · 39 checked examples
Sky
Weather
- Air pressure at altitude and boiling point calculator
Air pressure at altitude from the standard atmosphere, with temperature, air density and the boiling point of water, or the altitude for a given pressure.
- Wind chill, heat index and dew point calculator
Wind chill and heat index calculator: the feels-like temperature from the NWS formulas, plus dew point, frostbite risk and heat-stress level.
Environment
- Personal carbon footprint calculator
Carbon footprint calculator: yearly tonnes of CO₂e from driving, flights, train and bus, home electricity and diet, using UK government emission factors.
- Rainwater harvesting calculator
Rainwater harvesting calculator: yearly litres or gallons a roof collects from its area, rainfall and efficiency, and the share of household use it covers.
Fun
- Life path number calculator (numerology)
Life path number calculator: a birth date reduced to a numerology number from 1 to 9, or the master numbers 11, 22 and 33, with every step shown.
- Zodiac sign calculator: star sign and Chinese zodiac
Zodiac sign calculator: your star sign and its element from a birth date, plus the Chinese zodiac animal, element and yin or yang. For entertainment.
Choosing a calculator: Earth & fun
Do the weather calculators give a forecast?
No: wind chill, heat index and pressure tools apply formulas to the conditions you enter. Check an authoritative local forecast before an outdoor or safety decision.
How much rainwater can a roof collect?
The rainwater harvesting calculator works from roof area, rainfall and an efficiency allowance, and shows the share of household use it covers. Use consistent area and depth units, because their product is a volume.
Are zodiac and numerology results scientific?
No: those pages are labelled entertainment and turn a date or name into a conventional category. For an exact age or a date interval, use the date and time calculators.