Free Online Time Calculators
Accurate, instant converters for payroll timesheets, duration differences, military time, sleep cycles, and running pace.
Time Duration Calculator
Calculate the exact duration, hours, and minutes between two times. Free online elapsed time calculator for work timesheets, study logs, and flight durations.
Time to Decimal Converter
Convert hours and minutes into decimal format for payroll, invoicing, and timesheets. Accurate, instant conversion with calculation formulas and lookup chart.
Decimal to Time Converter
Convert decimal hours (e.g. 7.75) into hours and minutes (7 hours 45 minutes). Free online converter for payroll checks, billing, and timecard audits.
Military Time Converter
Easily convert standard 12-hour AM/PM time into 24-hour military time and vice versa. Includes full 24-hour military time translation chart.
Hours to Days Calculator
Convert any number of hours into days, remaining hours, and decimal days. Perfect for calculating project schedules, PTO hours, and delivery timelines.
Elapsed Time Calculator
Measure exact elapsed time, minutes, and seconds between two dates or times. Free time difference calculator with millisecond precision.
Time Addition Calculator
Add multiple time durations together. Perfect for summing daily work sessions, video timestamps, workout intervals, and billable client hours.
Sleep Cycle Calculator
Calculate the best bedtime or wake-up time based on 90-minute REM sleep cycles. Wake up refreshed, avoid sleep inertia, and optimize deep restorative rest.
Running Pace Calculator
Calculate your running pace, total time, or race distance for 5K, 10K, Half Marathon, and Marathon. Convert effortlessly between min/mile and min/km.
Real-Time Calculation
Instant live updates as you type — no page reloads or slow form submissions.
100% Free & Private
All calculations run client-side in your browser. No data is stored or logged.