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Easter date, daylight hours, snow-day probability, holiday budgeting. Plus some seasonal silliness.
Tap any card to open its calculator page.
Calculate the probability of a snow day based on temperature, snowfall, and wind
Plan your holiday spending across gifts, food, and travel
Calculate daylight hours, sunrise, and sunset for any latitude and day of year
Estimate total event cost, catering, and decorations from guest count and budget
Get recommended tree height, lights, ornaments, and tinsel from room dimensions
Calculate the date of Easter Sunday for any year using the Gregorian algorithm
Convert a Gregorian date to its Mayan Long Count calendar equivalent
Estimate total commitment hours and success probability for your resolutions
Calculate candy haul, calories, walking distance, and duration for Halloween
See how many days remain until Christmas
Calculate how long until vampires take over the world
Estimate snow needed and supplies for building a snowman
Estimate the probability of a white Christmas for your latitude
Calculate how long until zombies infect 50% of the population
All 570 calculators in your pocket. Offline-ready, no ads, no trackers. iOS and Android apps land soon — get notified when they ship.