calculators
Everyday
Dates, ages, tips and the quick day-to-day calculations you reach for most — fast, clear, and free.
Handy day-to-day calculators for the small stuff: work out an exact age, split a bill with the tip, and more. Each one is fast, mobile-friendly, and shows how the number was reached. There's also a maker's tool for the workshop: the 3D printer Vref calculator finds the exact stepper driver reference voltage for A4988, DRV8825, TMC2208, TMC2209 and TMC5160 drivers from a motor's rated current, converting datasheet peak current to RMS, applying a safety derating factor, matching the sense resistor on common mainboards, and outputting ready-to-paste Klipper and Marlin values.