Jump to the free time calculator
For a ready answer to a single question, use the date calculators for spans in days and weeks, or the time calculators for hours and minutes from now.
How to Calculate Time
Time calculations come up constantly: project estimates, payroll, travel planning, cooking. Unlike regular numbers, time uses a mixed-radix system: 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, 7 days in a week.
Common Time Conversions
| From | To | Formula |
|---|---|---|
| Minutes | Hours | ÷ 60 |
| Hours | Minutes | × 60 |
| Hours | Days | ÷ 24 |
| Days | Hours | × 24 |
| Days | Weeks | ÷ 7 |
| Weeks | Days | × 7 |
| Days | Years | ÷ 365 (366 in a leap year) |
Examples
| Note | Result |
|---|---|
| 3.5 hours in minutes | 210 minutes |
| 150 minutes in hours | 2.50 hours |
| 2 weeks in days | 14 days |
| 36 hours in days | 1.50 days |
Practical Time Calculations
Project Time Tracking
Tracking hours across multiple tasks in a project:
| Note | Result |
|---|---|
| design phase = 12 hours | 12 hours |
| development = 40 hours | 40 hours |
| testing = 16 hours | 16 hours |
| review = 8 hours | 8 hours |
| project hours = design phase + development + testing + review | 76 hours |
| work days = project hours / 8 hours | 9.50 |
| work days / 5 | 1.90 |
Payroll Hours
Calculating weekly hours for payroll:
| Note | Result |
|---|---|
| monday = 8.5 hours | 8.50 hours |
| tuesday = 7.75 hours | 7.75 hours |
| wednesday = 8 hours | 8 hours |
| thursday = 8.25 hours | 8.25 hours |
| friday = 9 hours | 9 hours |
| week hours = monday + tuesday + wednesday + thursday + friday | 41.50 hours |
| week hours - 40 hours | 1.50 hours |
For calculating pay from these hours, see our salary calculator or the freelance invoice calculator. The salary guide also answers how many work hours are in a year once holidays and vacation come off.
Travel Time Estimation
Planning a road trip:
| Note | Result |
|---|---|
| distance = 450 miles | 450 mi |
| speed = 60 mph | 60 mph |
| driving = distance / speed | 7.50 hours |
| driving in hours and minutes | 7 hours 30 min |
| rest stops = 2 * 15 minutes | 30 minutes |
| driving + rest stops | 8 hours |
Time Unit Reference
| Unit | In Seconds | Notes |
|---|---|---|
| Millisecond | 0.001 | Computer response times |
| Second | 1 | Base unit |
| Minute | 60 | Common for tasks |
| Hour | 3,600 | Work shifts, travel |
| Day | 86,400 | Calendar planning |
| Week | 604,800 | Sprint cycles, scheduling |
| Year | ~31,557,600 | Long-term planning |
| Century | ~3,155,760,000 | Historical context |
Free Time Calculator
Convert between time units instantly.
©2026 Notes Calculator. All rights reserved.
Example
How many minutes in 3.5 hours?
3.5 × 60 = 210 minutes
Frequently Asked Questions
How do I convert minutes to hours and minutes?
Divide the total minutes by 60. The whole number is the hours, and the remainder is the minutes. For example, 195 minutes: 195 / 60 = 3 hours with a remainder of 15 minutes, so 195 minutes = 3 hours 15 minutes. In Notes Calculator, 195 minutes in hours and minutes shows 3 hours 15 min.
How do I calculate time between two dates?
Subtract the earlier date from the later date. For simple calculations, convert both to the same unit (days or hours) first. For example, January 1 to March 15 is 73 days (10 weeks and 3 days) in a common year, and 74 days (10 weeks and 4 days) in a leap year such as 2028, because February has 29 days. The count excludes the start day: 30 (rest of Jan) + 28 or 29 (Feb) + 15 (Mar). Counting both January 1 and March 15 gives one more day: 74 in a common year, 75 in a leap year.
Calculate Time in Notes Calculator
Notes Calculator supports all time units with natural conversion syntax:
| Note | Result |
|---|---|
| design = 3 days | 3 days |
| development = 2 weeks | 2 weeks |
| testing = 4 days | 4 days |
| // Convert to common unit | |
| design in hours | 72 hours |
| development in days | 14 days |
| design + development + testing | 3 weeks |
| // Payroll calculation | |
| hours worked = 42.5 hours | 42.50 hours |
| hours worked in minutes | 2,550 minutes |
| // Time conversions | |
| 1 year in days | 365 days |
| 1 year in hours | 8,760 hours |
| 90 minutes in hours | 1.50 hours |
| 86400 seconds in days | 1 day |
Use to, in, or as to convert between seconds, minutes, hours, days, weeks, years, and even centuries. The total keyword sums consecutive time values, and variables let you adjust project estimates and see all dependent calculations update instantly. The docs cover durations, date arithmetic and timezones in the dates and times guide.
For converting your time into pay, check the salary calculator. For tracking time in a notepad calculator vs spreadsheet, see our comparison guide.