Utility & Time Calculators
Everyday calculation utilities for payroll time cards, business days, calendar intervals, and unit conversions. Browse all 11 calculators below with automatic unit conversions.
Time Calculator (Hours & Minutes)
Add or subtract time durations in hours and minutes with decimal conversion.
Days Between Dates Calculator
Calculate calendar days, business days, weeks, and month delta between two dates.
Time Card Calculator (Hours & Overtime)
Calculate daily shift hours and weekly overtime from clock-in, clock-out, and unpaid breaks.
Currency Converter
Convert between world currencies with custom rates and fee adjustments.
Grade Calculator (Weighted Average)
Calculate weighted class average and the final exam score required to earn your target grade.
Tip Calculator & Bill Splitter
Calculate gratuity and split restaurant checks evenly across any party size.
Roman Numeral Converter (1–3,999)
Convert between standard Arabic integers and classical Roman numerals with subtractive notation.
Dice Roller (RPG & Tabletop Simulator)
Roll virtual tabletop polyhedral dice (d4, d6, d8, d10, d12, d20, d100) with modifier math.
Business Days Calculator
Count business days between any two calendar dates, automatically excluding Saturdays and Sundays.
ISO Week Number Calculator
Find the official ISO 8601 calendar week number, day of year, and annual progress for any date.
Time Zone Converter (UTC Offset)
Convert local time across international time zones using standard UTC offsets.