Everyday Calculators
Practical tools for daily life: split a restaurant bill, plan sleep cycles, work out discounts and fuel costs, convert Roman numerals, generate random numbers, create strong passwords, and add up work hours.
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.
Password Generator
Strong, random passwords generated locally with a cryptographically secure RNG.
Hours Calculator
Hours between start and end times, minus breaks — with decimal hours and optional pay.
Aspect Ratio Calculator
Find the aspect ratio of any width and height, or resize while keeping the same ratio.
Unit Price Calculator
Price per unit and side-by-side compare to spot the better-value pack.
Speed, Distance & Time
Solve for speed, distance or time — with miles, km, mph, km/h and m/s.
Subnet Calculator
IPv4 CIDR subnet solver: network, broadcast, mask, wildcard, host range and usable hosts.
Cost Split Calculator
Split a bill or shared expenses fairly — equally, itemized, or by custom shares.