Everyday Calculators

Practical tools for daily life: split a restaurant bill, plan sleep cycles, work out discounts and fuel costs, convert Roman numerals, and generate random numbers.

Tip Calculator

Work out the tip, total bill, and split per person.

Sleep Calculator

Find the best bedtime or wake-up time based on sleep cycles.

Discount Calculator

Sale price after a percentage off and how much you save.

Fuel Cost Calculator

Trip fuel needed and total cost in US or metric units.

Roman Numeral Converter

Convert numbers to Roman numerals and back (1–3999).

Random Number Generator

Pick random numbers between any min and max, with optional unique (no repeats) mode.