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The Time Converter provides instant conversion between all standard time units — from seconds to years. Whether you need to convert hours to seconds for a programming calculation, days to weeks for project planning, or years to days for age calculations, this tool handles all time conversions quickly and accurately.
Time is universally measured using the same units worldwide, but conversions between units are frequently needed in software development (timestamps, timeout values), project management (deadlines, durations), science and engineering (decay rates, periods), finance (interest calculations, loan durations), and everyday planning.
While seconds, minutes, hours, and days have exact definitions, months and years require averages: a standard year averages 365.25 days (accounting for leap years), and a month averages 30.4375 days (365.25 ÷ 12). These averages are used for calculations involving months and years, and results may differ slightly from calendar-specific calculations.
All time values are converted to seconds first, then converted to each output unit.
Conversion factors to seconds:
$$days = \frac{seconds}{86400}$$
$$weeks = \frac{seconds}{604800}$$
$$hours = \frac{seconds}{3600}$$
The use of 365.25 days per year (the Julian year) accounts for the extra day in leap years. For precise calendar calculations involving specific date ranges, a dedicated date-difference calculator is recommended.
Useful time references: 1 million seconds ≈ 11.57 days. 1 billion seconds ≈ 31.7 years (roughly a human generation). A typical work year is about 2,080 hours (52 weeks × 40 hours). A day is 86,400 seconds. The light-travel time from the Sun to Earth is approximately 499 seconds (8 minutes 19 seconds). Human reaction time is typically 150–300 milliseconds (0.15–0.3 seconds).
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A 2-hour film is exactly 7,200 seconds or 120 minutes. This conversion is useful for video editing, streaming bandwidth calculations, and media production.
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90 days equals approximately 12.86 weeks or about 2.96 average months. This conversion is useful for contract durations, warranty periods, and project deadlines.
There are exactly 86,400 seconds in one day: 24 hours × 60 minutes × 60 seconds = 86,400. This is a fundamental constant in computing (Unix timestamps increment by 86,400 per day), physics, and navigation. Note: leap seconds are occasionally added to atomic time standards, but are not used in most practical calculations.
A common year has 365 days. A leap year has 366 days (occurs every 4 years, with exceptions for century years). The Julian year averages 365.25 days and is used in astronomy and this converter. The Gregorian year averages 365.2425 days. For everyday purposes, 365 or 365.25 is sufficiently accurate.
Divide the minutes by 60 to get the decimal fraction. For example, 2 hours 30 minutes = 2 + 30/60 = 2.5 hours. 1 hour 45 minutes = 1.75 hours. 15 minutes = 0.25 hours. Most timesheet systems use decimal hours — this is essential for accurate payroll and billing calculations.
A Unix timestamp is the number of seconds elapsed since January 1, 1970, 00:00:00 UTC (the Unix epoch). As of 2026, it is approximately 1,741,000,000 seconds. Unix timestamps are universally used in computing to represent points in time, since they avoid timezone and calendar complexity. This converter can help you work with timestamp durations.
Calendar months have varying lengths (28, 29, 30, or 31 days). For general calculations, an average month of 30.4375 days (365.25 ÷ 12) is used. For precise calculations — such as interest calculations over specific months — you should use actual calendar dates rather than this average. The average is suitable for rough estimates and duration planning.
A standard full-time work year in the US is 2,080 hours: 52 weeks × 40 hours/week. After accounting for typical vacation (10 days) and holidays (10 days), the actual working hours are approximately 1,880 hours. In Europe, statutory vacation time is typically higher (20–30 days), reducing annual working hours to 1,700–1,850.
Roboculator Team
The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
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