Christmas Tree Calculator - Calculate the exact length of lights, number of baubles, tinsel, and ribbon needed for your Christmas tree. Uses cone geometry based on tree height and base width to give you a precise shopping list so you never buy too much or too little. New

Vampire Apocalypse Calculator - Simulate a vampire outbreak using the Lotka-Volterra predator-prey model. Set initial populations, feeding rates, and conversion rates to see how quickly humanity falls — or fights back. New