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Time Converter

Our time converter helps you convert between 16 time units from picoseconds to millenniums. Fast, accurate, and works instantly in your browser. Perfect for scientific calculations, project planning, and everyday time conversions.

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Time Units: 16
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Cost: Free

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16 Time Units

Convert between picoseconds, nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, fortnights, months, quarters, years, decades, centuries, and millenniums.

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Instant Conversion

All conversions happen instantly in your browser using precise mathematical calculations. No server delays, no API calls—just instant results.

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100% Private

All conversions happen locally in your browser. We never store, log, or transmit your conversion data. Complete privacy guaranteed.

Time Converter online

Convert between 16 time units with instant, precise calculations

Understanding Time Units

Time units measure the duration of events and intervals. Understanding each unit's origin, common applications, and relationships helps you choose the right unit for your needs and make accurate conversions. Here's a comprehensive guide to all time units supported by our converter.

⚛️Ultra-Small Time Units (Scientific)

ps

Picosecond (ps)

Definition: One picosecond equals 1 trillionth of a second (1/1,000,000,000,000 second or 10⁻¹² seconds). The prefix "pico" means one trillionth in the metric system.

Common Uses: Picoseconds are used in ultrafast physics, laser science, and advanced electronics. Examples include: ultrafast laser pulses, molecular dynamics simulations, quantum computing operations, high-speed electronics timing, and atomic-scale processes. Light travels approximately 0.3 millimeters (0.012 inches) in one picosecond in a vacuum. This unit is essential for studying processes that occur at the atomic and molecular level.

Conversion: 1 ps = 0.000000000001 s = 0.001 ns = 1,000 fs

ns

Nanosecond (ns)

Definition: One nanosecond equals 1 billionth of a second (1/1,000,000,000 second or 10⁻⁹ seconds). The prefix "nano" means one billionth in the metric system.

Common Uses: Nanoseconds are used in computer science, electronics, and physics. Examples include: computer processor clock cycles (modern CPUs operate at gigahertz frequencies, where each cycle is measured in nanoseconds), memory access times, network latency measurements, laser pulse durations, and quantum physics experiments. Light travels approximately 30 centimeters (11.8 inches) in one nanosecond in a vacuum.

Conversion: 1 ns = 0.000000001 s = 0.000001 ms = 0.001 μs

μs

Microsecond (μs)

Definition: One microsecond equals 1 millionth of a second (1/1,000,000 second or 10⁻⁶ seconds). The prefix "micro" means one millionth in the metric system.

Common Uses: Microseconds are used in electronics, telecommunications, and scientific measurements. Examples include: radio frequency timing, audio signal processing, camera shutter speeds (some high-speed cameras capture images in microseconds), radar systems, and timing measurements in physics experiments. Light travels approximately 300 meters (984 feet) in one microsecond in a vacuum.

Conversion: 1 μs = 0.000001 s = 0.001 ms = 1,000 ns

ms

Millisecond (ms)

Definition: One millisecond equals 1 thousandth of a second (1/1,000 second or 10⁻³ seconds). The prefix "milli" means one thousandth in the metric system.

Common Uses: Milliseconds are commonly used in computing, sports timing, and everyday measurements. Examples include: computer response times, video game frame rates (60 FPS = 16.67 ms per frame), reaction time measurements, stopwatch precision, audio latency, and network ping times. Human reaction time is typically 150-300 milliseconds. A typical blink of an eye takes 100-400 milliseconds.

Conversion: 1 ms = 0.001 s = 1,000 μs = 1,000,000 ns

⏰Standard Time Units (SI Base)

s

Second (s)

Definition: The second is the base unit of time in the International System of Units (SI). It is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.

History: The modern definition of the second was adopted in 1967, replacing the older definition based on the Earth's rotation. This atomic definition provides extreme precision and stability, making it the foundation for all time measurements worldwide. The second is one of the seven base units in the SI system.

Common Uses: Seconds are the most fundamental time unit, used in all scientific, engineering, and everyday applications. Examples include: scientific measurements, sports timing, cooking timers, countdown timers, and all time-based calculations. The heartbeat of an average adult at rest is approximately 60-100 beats per minute, or about 0.6-1 second per beat.

Conversion: 1 s = 1,000 ms = 1,000,000 μs = 1,000,000,000 ns

min

Minute (min)

Definition: One minute equals 60 seconds. The minute is not an official SI unit but is accepted for use with SI units. It's one of the most commonly used time units in everyday life.

History: The minute has been used since ancient times, originally derived from dividing an hour into 60 parts (following the Babylonian sexagesimal system). The word "minute" comes from the Latin "pars minuta prima" meaning "first small part."

Common Uses: Minutes are used extensively in everyday life for timing activities, meetings, cooking, exercise, and scheduling. Examples include: meeting durations (30-minute meetings), cooking times (bake for 45 minutes), exercise intervals (run for 20 minutes), and time estimates. Most people think in minutes for short to medium-duration activities.

Conversion: 1 min = 60 s = 0.0167 hours

h

Hour (h)

Definition: One hour equals 60 minutes or 3,600 seconds. Like the minute, the hour is not an official SI unit but is accepted for use with SI units and is fundamental to our daily timekeeping.

History: The hour has been used since ancient civilizations, with the 24-hour day being divided into 12 hours of daylight and 12 hours of darkness (though the length varied with seasons). The modern equal-length hour became standard with mechanical clocks in the Middle Ages.

Common Uses: Hours are the standard unit for work schedules, travel time, and longer activities. Examples include: work shifts (8-hour workday), travel time (2-hour flight), movie durations (90-minute to 3-hour films), sleep duration (7-9 hours per night), and hourly wages. The average human sleeps 7-9 hours per day.

Conversion: 1 h = 60 min = 3,600 s = 0.0417 days

📅Calendar Time Units

d

Day (d)

Definition: One day equals 24 hours or 86,400 seconds. A day represents one complete rotation of the Earth on its axis relative to the Sun (solar day).

History: The concept of a day is one of the oldest time measurements, based on the natural cycle of day and night. The 24-hour division comes from ancient Egyptian and Babylonian systems. The modern definition is based on the mean solar day.

Common Uses: Days are fundamental to human life and scheduling. Examples include: project timelines (5-day workweek), medication schedules (take twice daily), vacation planning (7-day trip), and age calculations. Most people organize their lives around daily cycles of work, rest, and activities.

Conversion: 1 d = 24 h = 1,440 min = 86,400 s

wk

Week (wk)

Definition: One week equals 7 days or 604,800 seconds. The week is a cultural and religious time unit, not based on astronomical cycles.

History: The 7-day week has ancient origins, possibly from the Babylonians who associated each day with a celestial body. It was adopted by many cultures and is now the standard work and rest cycle in most of the world.

Common Uses: Weeks are used for scheduling, planning, and recurring cycles. Examples include: work schedules (40-hour workweek), pregnancy tracking (measured in weeks), project timelines (2-week sprint), pay periods (bi-weekly), and course schedules (10-week semester). Most calendars and planners are organized by weeks.

Conversion: 1 wk = 7 d = 168 h = 604,800 s

14d

Fortnight

Definition: One fortnight equals 14 days or 1,209,600 seconds. The word "fortnight" comes from "fourteen nights" and is commonly used in British English and some Commonwealth countries.

History: The fortnight has been used since Middle English times and remains a standard unit in many English-speaking countries outside North America. It's particularly common in the UK, Australia, and New Zealand for scheduling and planning purposes.

Common Uses: Fortnights are used for bi-weekly scheduling, pay periods, and project planning. Examples include: bi-weekly pay periods (paid every fortnight), rental agreements (fortnightly rent), project milestones, and vacation planning. Many businesses and organizations use fortnightly cycles for operations and reporting.

Conversion: 1 fortnight = 14 d = 336 h = 1,209,600 s = 2 weeks

mo

Month (30 days)

Definition: One month equals 30 days or 2,592,000 seconds. This is a standardized month used for calculations, as actual calendar months vary in length (28-31 days).

Note: Calendar months have different lengths: 28-31 days depending on the month and whether it's a leap year. For conversion purposes, we use 30 days as a standard average, which is commonly used in business and financial calculations.

Common Uses: Months are used for billing cycles, subscriptions, and medium-term planning. Examples include: monthly subscriptions, rent payments, billing cycles, project milestones, and age calculations (especially for babies and young children). Most financial and business operations use monthly cycles.

Conversion: 1 mo (30 days) = 30 d = 720 h = 2,592,000 s

Q

Quarter (3 months)

Definition: One quarter equals 3 months or 90 days (7,776,000 seconds). This is a standard business and financial time unit.

Common Uses: Quarters are fundamental to business, finance, and corporate reporting. Examples include: quarterly earnings reports (Q1, Q2, Q3, Q4), fiscal year planning, quarterly goals and reviews, stock market analysis, and business performance metrics. Most publicly traded companies report financial results quarterly. Academic years are often divided into quarters in some educational systems.

Business Context: The business year is typically divided into four quarters: Q1 (January-March), Q2 (April-June), Q3 (July-September), and Q4 (October-December). Quarterly reporting is required for public companies and provides regular updates on financial performance.

Conversion: 1 quarter = 3 mo = 90 d = 2,160 h = 7,776,000 s

yr

Year (365 days)

Definition: One year equals 365 days or 31,536,000 seconds. This represents a common year (non-leap year) in the Gregorian calendar.

Note: A leap year has 366 days (31,622,400 seconds) to account for the approximately 365.25 days it takes Earth to orbit the Sun. For conversion purposes, we use 365 days as the standard, which is accurate for most calculations.

Common Uses: Years are fundamental to age, history, and long-term planning. Examples include: age calculations, historical dates, annual reports, yearly goals, and long-term investments. The average human lifespan is approximately 70-80 years. Most major life events and milestones are measured in years.

Conversion: 1 yr (365 days) = 365 d = 8,760 h = 31,536,000 s = 4 quarters

🌍Long-Term Time Units

10yr

Decade

Definition: One decade equals 10 years or 315,360,000 seconds (based on 365-day years).

Common Uses: Decades are used for historical periods, generational analysis, and long-term trends. Examples include: historical eras (the 1960s, the 1990s), generational cohorts (millennials, Gen Z), economic cycles, and long-term planning. Decades help organize history and cultural trends into manageable periods.

Conversion: 1 decade = 10 yr = 3,650 d = 315,360,000 s

100yr

Century

Definition: One century equals 100 years or 3,153,600,000 seconds (based on 365-day years).

Common Uses: Centuries are used for major historical periods, geological time scales, and very long-term planning. Examples include: historical eras (20th century, 21st century), architectural lifespans, long-term environmental changes, and generational family histories. Most major historical events and cultural shifts are measured in centuries.

Historical Context: The 20th century (1901-2000) saw two world wars, space exploration, and the digital revolution. The 21st century (2001-2100) is marked by globalization, climate change awareness, and rapid technological advancement.

Conversion: 1 century = 100 yr = 36,500 d = 3,153,600,000 s = 10 decades

1000yr

Millennium

Definition: One millennium equals 1,000 years or 31,536,000,000 seconds (based on 365-day years). The word "millennium" comes from Latin "mille" (thousand) and "annus" (year).

Common Uses: Millenniums are used for very long-term historical periods, geological time scales, and major cultural epochs. Examples include: major historical transitions (the turn of the millennium in 2000), geological eras, long-term climate studies, and civilization timelines. The concept of millennia helps organize human history into major epochs and cultural periods.

Historical Context: The first millennium CE (1-1000) saw the rise and fall of empires, the spread of major religions, and significant cultural developments. The second millennium (1001-2000) included the Renaissance, Industrial Revolution, and modern era. The third millennium (2001-3000) is just beginning and will see continued technological and social evolution.

Conversion: 1 millennium = 1,000 yr = 365,000 d = 10 centuries = 100 decades

Quick Reference: Time Unit Equivalents

Unit	Seconds	Minutes	Hours
1 Nanosecond	0.000000001 s	1.67×10⁻¹¹ min	2.78×10⁻¹³ h
1 Microsecond	0.000001 s	1.67×10⁻⁸ min	2.78×10⁻¹⁰ h
1 Millisecond	0.001 s	0.0000167 min	0.000000278 h
1 Second	1 s	0.0167 min	0.000278 h
1 Minute	60 s	1 min	0.0167 h
1 Hour	3,600 s	60 min	1 h
1 Day	86,400 s	1,440 min	24 h
1 Week	604,800 s	10,080 min	168 h
1 Year (365 days)	31,536,000 s	525,600 min	8,760 h
1 Decade	315,360,000 s	5,256,000 min	87,600 h
1 Century	3,153,600,000 s	52,560,000 min	876,000 h
1 Millennium	31,536,000,000 s	525,600,000 min	8,760,000 h

What is Time Conversion?

Time conversion is the process of converting a time measurement from one unit to another. Time is one of the most fundamental measurements in science, engineering, and daily life. Understanding how to convert between different time units is essential for calculations, project planning, scientific research, and programming applications.

Time units range from the extremely small (nanoseconds, used in computer science and physics) to the very large (centuries, used in historical and geological contexts). The most commonly used time units include seconds, minutes, hours, days, weeks, months, and years. Each unit has a precise mathematical relationship to the others, with the second being the base unit in the International System of Units (SI).

According to the International Bureau of Weights and Measures (BIPM), the second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom. This precise definition allows for accurate conversions between all time units, from nanoseconds (1 billionth of a second) to centuries (100 years).

✗Manual Calculation

• Time-consuming conversions
• Risk of calculation errors
• Difficult for large numbers
• No support for small units

✓Online Time Converter

• Instant conversion results
• Precise calculations
• Handles any magnitude
• Supports 16 time units

Time Conversion Facts

Interesting facts about time units and their relationships

86,400

Seconds in a Day

Standard 24-hour period

31,536,000

Seconds in a Year

365-day calendar year

1×10⁻⁹

Nanosecond

One billionth of a second

604,800

Seconds in a Week

7 days × 86,400 seconds

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Time Measurement Standards

According to the International Bureau of Weights and Measures (BIPM), the second is the base unit of time in the International System of Units (SI). All time conversions are based on precise mathematical relationships derived from this fundamental definition, ensuring accuracy across all time unit conversions from nanoseconds to centuries.

Why Use Our Time Converter?

Our time converter provides instant, accurate conversions between 16 time units with high precision. Whether you're working on scientific calculations, programming applications, or planning projects, our tool offers the speed, accuracy, and convenience you need.

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Instant Client-Side Conversion

All time conversions happen instantly in your browser using precise mathematical calculations. No server delays, no API calls, no waiting—just instant results whenever you need them. Perfect for quick calculations, programming tasks, and scientific work where speed matters.

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16 Comprehensive Time Units

Convert between picoseconds, nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, fortnights, months, quarters, years, decades, centuries, and millenniums. This comprehensive range covers everything from the smallest time measurements used in ultrafast physics to the largest units used in historical and geological contexts.

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High-Precision Calculations

Our converter uses precise mathematical formulas based on the International System of Units (SI) definitions. Conversions maintain high precision, making it suitable for scientific calculations, engineering projects, and programming applications where accuracy is critical.

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100% Private & Secure

All conversions happen locally in your browser. We never store, log, or transmit your conversion data. Your calculations remain completely private, making this tool safe for sensitive scientific or business calculations. No registration, no tracking, no data collection.

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Completely Free Forever

Use our time converter as much as you want, whenever you need it, without any cost. No hidden fees, no premium tiers, no usage limits. Convert time units unlimited times for free, making it perfect for students, professionals, scientists, and anyone who needs regular time conversions.

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Mobile-Friendly Design

Access our time converter from any device—desktop, tablet, or smartphone. The responsive design works perfectly on all screen sizes, so you can convert time units on the go. Perfect for professionals who need quick conversions while working in the field or traveling.

How It Works

Our time converter uses precise mathematical conversions based on the International System of Units (SI) definitions. All conversions are calculated client-side in your browser for instant results.

1

Select Units

Choose your source time unit from the "Convert From" dropdown and your target time unit from the "Convert To" dropdown.

2

Enter Amount

Type the amount you want to convert in the input field. You can enter whole numbers or decimals.

3

Calculate

Our converter calculates the conversion using precise mathematical formulas, converting to seconds first, then to your target unit.

4

View Result

Click Convert to instantly see the converted amount displayed clearly with appropriate precision formatting.

Best Practices for Time Conversion

When converting time units, following best practices ensures you get accurate results and understand the relationships between different time measurements. Here are essential tips for using time converters effectively:

1. Understand Unit Relationships

Familiarize yourself with common time unit relationships. For example, 1 hour = 60 minutes = 3,600 seconds, 1 day = 24 hours = 86,400 seconds, and 1 year = 365 days = 31,536,000 seconds. Understanding these relationships helps you verify conversions and catch potential errors.

2. Consider Precision for Small Units

When working with very small time units like nanoseconds or microseconds, be aware that results may be displayed in scientific notation for extremely small values. This is normal and ensures precision is maintained. For example, converting 1 nanosecond to hours results in a very small decimal number.

3. Use Appropriate Units for Your Context

Choose time units that make sense for your application. For computer science and programming, nanoseconds and milliseconds are common. For everyday use, seconds, minutes, and hours are most practical. For historical or geological contexts, years, decades, and centuries are appropriate.

4. Verify Large Number Conversions

When converting very large numbers (e.g., converting millions of seconds to years), verify the result makes sense. For example, 31,536,000 seconds equals 1 year, so 100,000,000 seconds equals approximately 3.17 years. Double-checking helps catch input errors.

5. Note Month and Year Definitions

Our converter uses standard definitions: 1 month = 30 days (2,592,000 seconds) and 1 year = 365 days (31,536,000 seconds). For precise calendar calculations, you may need to account for actual month lengths and leap years, but for most conversions, these standard values provide sufficient accuracy.

Frequently Asked Questions

How do I convert time units online?

To convert time units online, select your source time unit from the 'Convert From' dropdown (e.g., hours, minutes, seconds), choose your target time unit from the 'Convert To' dropdown, enter the amount you want to convert, and click the Convert button. The tool will instantly display the converted amount using precise mathematical conversions.

What time units are supported by this converter?

Our time converter supports 16 time units including picoseconds, nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, fortnights, months (30 days), quarters (3 months), years (365 days), decades, centuries, and millenniums. This comprehensive range covers everything from the smallest time measurements used in ultrafast physics to the largest units used in historical contexts, making it perfect for scientific calculations, project planning, business applications, and everyday conversions.

How accurate are the time conversions?

Our time converter uses precise mathematical conversions based on standard time unit definitions. Conversions are calculated client-side in your browser with high precision, ensuring accurate results. For example, 1 hour = 3600 seconds, 1 day = 86400 seconds, and 1 year = 31536000 seconds (365 days).

Can I convert between very small time units like nanoseconds?

Yes, our converter supports conversions between very small time units including nanoseconds (1 billionth of a second), microseconds (1 millionth of a second), and milliseconds (1 thousandth of a second). This makes it perfect for scientific calculations, computer science applications, and precision timing measurements.

Is this time converter free to use?

Yes, our time converter is completely free to use. There are no registration requirements, no hidden fees, and no limits on the number of conversions you can perform. Simply visit the page, enter your values, and convert time units instantly without any cost.

How do I convert days to hours or weeks to days?

To convert days to hours, select 'Day' as the source unit and 'Hour' as the target unit, enter the number of days, and click Convert. Similarly, to convert weeks to days, select 'Week' as the source and 'Day' as the target. The converter handles all standard time unit conversions automatically with precise calculations.

Are the conversions calculated in real-time?

Yes, all conversions are calculated instantly in your browser using precise mathematical formulas. There's no server delay, no API calls, and no waiting time. The conversion happens immediately when you click the Convert button, providing instant results for any time unit conversion.

Can I use this for scientific or programming calculations?

Absolutely. Our time converter provides high-precision conversions suitable for scientific calculations, programming applications, and engineering projects. It supports conversions from nanoseconds to centuries, making it ideal for a wide range of technical and scientific applications where precise time measurements are required.