Holiday Tools & Seasonal Calculators
The season's last-minute math, solved in one click. New holiday tools appear here all year, so check back before each big date.
Clock changes
Daylight Saving Time Calculator
A live countdown to the next clock change, with the 2026 and 2027 dates for the US, UK, Europe, Canada, Australia and New Zealand.
Halloween
Halloween Candy Calculator
How much candy do you need? Estimate trick-or-treaters, pieces per kid, and total cost for your block.
Thanksgiving
Turkey Cooking Time Calculator
Weight, stuffing, and oven temperature in — a precise roast time and back-calculated start time out.
Christmas
Secret Santa Generator
Draw names fairly with no self-draws or mutual pairs, then copy a private assignment for everyone.