Time Calculator and Converter Directory
Real-Time Timers & Trackers
When you need live accountability instead of a spreadsheet, use these timers. They power deep work blocks, launch-day prep, travel countdowns, and production laps with locally-run controls, prep reminders, and exportable summaries. Pick the Pomodoro Timer for tomato-style intervals with goal tracking, spin up the multiple stopwatch board for hotkey-driven lap sessions, then shift to the countdowns when you need single-shot durations.
Pomodoro Timer
Structured tomato timer cycles with auto breaks, logs, and progress coaching.
Countdown Timer
Structured focus blocks with presets, progress bars, and action logs.
Countdown to Date & Time
Exact days, hours, and prep windows before launches, flights, or livestreams.
Stopwatch
Lap and split tracking for workouts, experiments, and QA runs.
Multiple Stopwatches
Parallel or switch-mode stopwatches with hotkeys, macro groups, laps, and exports.
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.
Date Offset Calculators
Sometimes you only need to shift one anchor date instead of comparing two clocks. These date offset calculators add or subtract years, months, weeks, days, and even precise hours or seconds from any baseline so travel plans, project launches, and compliance notices stay aligned worldwide.
Date Calculator
Shift a single calendar date with stacked offsets and copy ISO, weekday, and relative-to-today summaries.
Datetime Calculator
Move full timestamps--years through seconds--with automatic UTC context, unix exports, and planning presets.
Use these two calculators when you need a clear "before and after" statement for roadmaps, editorial schedules, or travel itineraries without manually counting days on a wall calendar.
Time Shift Calculators
Need to move weeks, months, days, hours, minutes, or seconds forward and backward? This new suite combines precise add/subtract operations with “between” modes so you can measure differences without spreadsheets. Every calculator inherits the same mobile-friendly layout, shareable summaries, and quick reference charts.
Week Calculator
Add or subtract weeks, or measure weeks between two dates with ISO-ready context.
Months Calculator
Shift months or calculate the exact months between two dates with two-decimal rounding.
Days Calculator
Handle day-level offsets and comparisons, complete with hours and minutes for verification.
Hours Calculator
Add or subtract hours (including decimals) and run difference checks down to the second.
Minutes Calculator
Minute-level offsets with two-decimal precision and quick tables for 5-480-minute jumps.
Seconds Calculator
Second-level add/subtract operations with fractional support for broadcast or lab work.
Each calculator includes preset buttons, detailed walkthroughs, and quick-reference charts so you can gather answers in seconds and paste them into your roadmap, runbook, or client recap.
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.
Average Time Calculator
Blend multiple durations across years through seconds to produce trustworthy averages.
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.
Speech & Presentation Timing
Rehearse talks with the same precision used for payroll math. These pacing tools combine word counting, realistic words-per-minute presets, word to time budgeting, and live timers so presenters can predict stage time, balance panel segments, and respect broadcast schedules.
Speed Time Calculators
Finish podcasts, audiobooks, videos, and movies faster without sacrificing comprehension, then translate those pacing skills to real-world travel and training. These speed-focused planners convert original runtimes into real watch or listen time at boosted playback speeds, surface the minutes you save, and now include a speed distance time calculator for route planning, fleet coordination, and tempo workouts.
Playback Speed Hub
Compare time saved across media types, copy shareable links, and launch dedicated speed calculators.
Video Speed Calculator
Plan YouTube lessons, course modules, and webinar replays with precise watch times at 0.2x–3.0x.
Podcast Speed Calculator
Map episodes to commute blocks, workouts, and study sessions while tracking minutes saved.
Audiobook Speed Calculator
Estimate faster listening time for chapters, trilogies, and learning catalogs with clear saved hours.
Movie Speed Calculator
Preview binge sessions, director cuts, and documentary marathons at boosted playback speeds.
Speed Distance Time Calculator
Solve for travel time, distance, or speed with unit conversions for road trips, fieldwork, and athletics pacing.
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.
Timestamp & Date Converters
Stay aligned across timezones by translating between human schedules and epoch numbers. These utilities expose sec-to-date, ms-to-date, and date-to-timestamp outputs with documentation-ready summaries.
Decimal to Time Converters
Decimal to Time (All Time Units)
Choose days, hours, minutes, or seconds as input; format as DD:HH:MM:SS.
Decimal Hours to Time
Transform decimal hours into professional HH:MM:SS summaries.
Decimal Minutes to Time
Convert decimal minutes into time strings ready for agendas and recaps.
Decimal Days to Time
Take decimal days and reveal their DD:HH:MM:SS breakdowns.
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).
Minutes to Milliseconds
Convert minutes to milliseconds with charts and workflow tips.
Milliseconds to Minutes
Translate milliseconds to minutes for readable reports.
Seconds to Milliseconds
Multiply seconds by 1,000 for millisecond precision.
Milliseconds to Seconds
Divide milliseconds by 1,000 to present seconds.
Microseconds to Milliseconds
Scale microsecond data to milliseconds instantly.
Milliseconds to Microseconds
Expand milliseconds into microseconds for granular timing.
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: December 5, 2025