Time Calculator and Converter Directory
A complete directory of every time calculator and converter on our site. Find tools for payroll, project management, and data analysis. Convert time to decimal, calculate time durations, and perform bulk operations instantly.
Duration Calculators
Measure precise spans between timestamps or birth dates with millisecond control. These duration-focused tools copy totals instantly so operations teams, planners, and families can move from stopwatch readings to actionable decisions.
Time Duration Calculator
Compare two time readings down to the millisecond and export totals in seconds, minutes, or hours.
Date Duration Calculator
Track calendar-aware spans in seconds through years with adjustable decimal precision.
Time Duration with Breaks
Subtract rest breaks from shifts and copy net time across seconds, minutes, hours, and HH:MM:SS.
Age Calculator
See full age breakdowns, age in different time units, and the countdown to the next birthday.
Time Arithmetic Calculators
Run complete time math inside one workspace. These tools add, subtract, multiply, and divide HH:MM:SS entries, normalize units, and export results in decimal hours or minutes for payroll, production, and coaching scenarios.
Time Arithmetic Calculator
Switch between add, subtract, multiply, and divide operations without leaving the page.
Add Time Calculator
Sum unlimited rows, capture weekly templates, and export decimal hours instantly.
Subtract Time Calculator
Compare start-end pairs, visualize borrowing, and clamp negatives when policy requires.
Multiply Time Calculator
Scale durations by decimal or fractional factors with documented rounding strategies.
Divide Time Calculator
Split totals into equal shares, show quotients and remainders, and choose remainder strategy.
Payroll & Timesheet Tools
Time Offset Calculators
Project or reconstruct precise timestamps without spreadsheets. These interactive tools handle forward planning and historical audits across years, months, weeks, days, hours, minutes, and seconds.
Time From Now Calculator
Project exact future timestamps from combined days, hours, minutes, and seconds.
Time Ago Calculator
Reconstruct when an event occurred with a verifiable audit trail.
Years From Now Calculator
Forecast long-range strategic plans and capital projects.
Years Ago Calculator
Analyze multi-year historical data for reporting and trend analysis.
Months From Now Calculator
Define future milestones for roadmaps, hiring, and change management.
Months Ago Calculator
Audit multi-month timelines for program reviews and compliance.
Weeks From Now Calculator
Forecast multi-week milestones for hiring plans, product launches, and capital projects.
Weeks Ago Calculator
Review historical commitments spanning weeks for retrospectives and executive updates.
Days From Now Calculator
Project future dates for sprints, maintenance, and customer commitments.
Days Ago Calculator
Reconstruct past dates for incident reports and timeline audits.
Hours From Now Calculator
Turn fractional hours into deadlines for billing, dispatch, and shift planning.
Hours Ago Calculator
Audit hourly history when support cases, incidents, or contracts need exact timing.
Minutes From Now Calculator
Coordinate short-run tasks such as live broadcasts, dispatch windows, or sprint handoffs.
Minutes Ago Calculator
Capture minute-level lookbacks for compliance reviews and customer updates.
Seconds From Now Calculator
Plan mission-critical seconds for launch procedures, trading triggers, or lab experiments.
Seconds Ago Calculator
Verify second-level events and attach proof to incident or quality logs.
Time to Decimal
Time to Decimal Converter (All Time Units)
Enter dd:hh:mm:ss and get results in hours, minutes and seconds.
Time to Decimal Days
Enter days, hours, minutes, seconds. Get time in decimal days instantly.
Time to Decimal Hours
Convert standard time to decimal hours for payroll and billing.
Time to Decimal Minutes
Get a precise minutes total—great for media timelines.
Time to Decimal Seconds
Compute total seconds for APIs, logs, and data pipelines.
Bulk Time to Decimal
Paste one value per line. Export results to Excel for fast imports.
Bulk Time to Decimal (All Time Units)
Get total hours, minutes, and seconds per row.
Bulk Time to Decimal Days
Transform HH:MM, HH:MM:SS, or DD:HH:MM:SS into decimal days.
Bulk Time to Decimal Hours
Batch convert mixed time strings to decimal hours.
Bulk Time to Decimal Minutes
Output minutes totals with two‑decimal readability.
Bulk Time to Decimal Seconds
Get total seconds per row for analytics and exports.
Decimal to Time Converters
Bulk Decimal to Time Converters
Decimal Time Unit Converters
Decimal Hours to Decimal Days
Divide hours by 24 to get time in decimal days.
Decimal Hours to Decimal Minutes
Multiply hours by 60 for decimal minutes.
Decimal Hours to Decimal Seconds
Multiply hours by 3600 for total seconds.
Decimal Hours to Decimal Weeks
Convert hours into calendar weeks (÷ 168).
Decimal Days to Decimal Weeks
Divide days by 7 for decimal weeks.
Decimal Days to Decimal Minutes
Multiply days by 1440 for total minutes.
Decimal Days to Decimal Hours
Multiply days by 24 for decimal hours.
Decimal Days to Decimal Seconds
Get total seconds (× 86,400).
Decimal Minutes to Decimal Days
Divide minutes by 1,440 for decimal days.
Decimal Minutes to Decimal Hours
Divide minutes by 60 to get hours.
Decimal Minutes to Decimal Seconds
Multiply minutes by 60 for seconds.
Decimal Minutes to Decimal Weeks
Divide minutes by 10,080 for decimal weeks.
Decimal Seconds to Decimal Minutes
Divide seconds by 60 to get decimal minutes.
Decimal Seconds to Decimal Hours
Divide seconds by 3600 for decimal hours.
Decimal Seconds to Decimal Days
Convert seconds to decimal days (÷ 86,400).
Decimal Seconds to Decimal Weeks
Convert seconds to decimal weeks (÷ 604,800).
Bulk Decimal Time Unit Converters
Free Time Conversion and Calculation Resources
Minutes to Decimal Hours Conversion Chart (PDF)
A printable chart for converting minutes to decimal hours, perfect for timesheets.
Hours to Decimal Minutes Conversion Chart (PDF)
A handy reference for converting decimal hours back into minutes.
Time Clock Rounding Rules Quick Reference (PDF)
A guide to common time clock rounding rules (5, 6, 10, 15, and 30-minute rules).
Frequently Asked Questions
Last updated: October 22, 2025