The hour calculator helps you calculate total hours between any start time and end time. You can choose a 12-hour or 24-hour format and optionally deduct breaks to calculate the exact time you worked. This calculator is ideal for tracking work hours, shifts, and time duration.

The 12-hour clock format is the most commonly used format in day-to-day life. This format divides the 24 hours into two 12-hour periods: AM (Ante Meridiem) - From 12:00 midnight to 11:59 in the morning. PM (Post Meridiem) - From 12:00 noon to 11:59 at night. When using this system, time is written using numbers from 1 to 12 with AM for morning and PM for afternoon and evening.

The 24-hour clock, also commonly known as military time, is a time format used majorly in military, aviation, and railways across many countries. This format eliminates the need for AM/PM designations and avoids confusion. In this format, the day starts at midnight (00:00) and ends at 11:59 PM (23:59).

The hours calculator uses time as a whole number in this calculator. E.g., 1215 for 12.15 and 142 for 1.42. Don’t use . or ;. If you enter just a number from 1 to 12, it will be considered a whole hour. When using the 12-clock format, 12 PM is noon, and 12 AM is midnight.

When converting time to decimal hours, break it down into hours and minutes. For example, 9.30. The hour part remains unchanged. To convert 30 minutes to hours, 30 minutes × (1 hour / 60 minutes) = 30/60 hours = 0.5 hours. So 9.30 is equal to 9.5 hours.

To convert decimal hours into standard time. For instance, if you have 8.75 as a decimal hour. 8 hours will be untouched. To convert minutes, multiply 0.75 by 60 to get minutes – 0.75 × 60 = 45 minutes. So, 8.75 hours = 8 hours 45 minutes (8:45).