Time calculators for dates, durations, time math, timestamps, timezones, work hours, age, and business days.
Date Difference Calculator
Find the exact span between two calendar dates.
Add / Subtract Time Calculator
Add or subtract days, hours, minutes, and seconds from a date and time.
Timezone Comparison Calculator
Compare the same moment across two timezones.
Work Hours Calculator
Calculate daily and weekly work hours with breaks, overtime, and pay.
Time Duration Calculator
Convert hours, minutes, and seconds into total duration units.
Countdown Calculator
See how much time remains until a target date and time.
Business Days Calculator
Count weekdays between two dates with optional holidays.
Time Card Calculator
Calculate work hours, breaks, overtime, and gross pay.
Age Calculator
Calculate age, total days lived, and days until the next birthday.
Meeting Planner
Compare a meeting window across timezones.
Event Time Announcer
Create a shareable event time list for global audiences.
Work Shift Planner
Calculate whether a target date is on or off shift in a repeating rotation.
Sunrise Sunset Calculator
Estimate sunrise, sunset, and daylight for a date and location.
Moon Phase Calculator
Find moon phase and illumination for a date.
Moonrise Moonset Calculator
Estimate moonrise and moonset for a location and date.
Finance
Finance calculators for loans, mortgages, APR, APY, simple interest, budgets, auto loans, retirement, debt, and everyday payments.
Math
Math calculators for arithmetic, geometry, percentages, ratios, rounding, roots, fractions, and statistics.
Physics
Physics calculators for motion, force, energy, electricity, and density.
Health
Health calculators for body metrics, calories, hydration, pace, due dates, body fat, and heart-rate zones.
Construction
Construction calculators for area, paint, flooring, concrete, gravel, mulch, roofing, tile, and slope estimates.
Auto
Auto calculators for fuel economy, trip cost, EV charging, and tire sizing.
Business
Business calculators for margins, markup, break-even, taxes, salary, discounts, commission, ROI, and pay rates.
Education
Education calculators for grades, GPA, weighted scores, finals, and reading time.