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Time Calculator

Free time calculator to add or subtract time from any day, hours, minutes, or seconds to a particular time. Online time adder to see what time will it be in the next 30 minutes and more.

Add+ Subtract-

About Time Calculator

The time calculator by SmallSEOTools is an online tool that makes time calculation easy and stress-free for people who need to keep track of time. On the basis of days, hours, minutes, and seconds, this clock calculator allows you to easily add or subtract time. This utility doesn’t charge you a penny. You can use this time adder from anywhere around the globe without facing compatibility or accessibility issues. 

How to Calculate Time with the Time Calculator?

Use the online time calculator to subtract and add time by following the simple steps given below:

  • Enter the time in days, hours, minutes, or seconds in the given boxes.
  • Choose Add or Subtract.
  • Enter the time in which you wish to add or subtract.
  • Click the “Calculate” button to initiate the process and get your hands on accurate results.

Subtract or Add Time Manually

The process of time subtraction and addition manually can be a hectic task. If you have the entire data in hours, minutes, or seconds, and you wish to get its representation in days, then you’ll need to make several conversions. Still, you may not get accurate results, as a single error can deteriorate all your efforts. Save your manual efforts by using the subtract or add time calculator.

To calculate time manually, you need to remember that:

  • 1 day = 24 hours = 1440 hours = 86400 seconds
  • 1 hour = 60 minutes = 3600 seconds
  • 1 minute = 60 seconds. 

After remembering these, you can manually add or subtract time to calculate the time gap.

How Does a Minute Calculator Work?

The minute calculator works on advanced algorithms that take your input values and calculate time on your behalf. The time calculation process is executed at the backend of this tool. Proceed with confidence that you won't encounter any troubles or difficulties

 Add Time Calculator

Tired of struggling to add up the total time you worked? Our add time calculator makes it easy! Just input values for days, hours, minutes, or seconds to find accurate answers. Here are a few examples that can help you understand the entire time addition processing.


Suppose that in the 1st week of January, you worked for 72 hours. In the second week, you worked 84 hours.

What is the total time that you worked in the first two weeks of January?


As the values are in hours, you can easily add them:

= 84 + 72

= 156

You worked 156 hours in the first two weeks of January. However, the role of the adding time calculator isn’t done here. As a single day has 24 hours, this calculator will turn your time into days by:

= 156/24

= 6.5

6.5 means that you have worked for 6 and a half days in the span of two weeks. This half-day will be converted to hours:

= 0.5 x 24

= 12

So, finally, the actual time you’ve worked for in January’s two weeks is 6 days and 12 hours.

Subtract Time Calculator

Subtracting two times from each other is also challenging like adding them but with the availability of a time subtractor, it's quite easy. Let’s see some of its examples below:


In February, Alex worked 372 hours. In March, he worked for 444 hours. How many more days Alex worked in March as compared to February?


As the information is available in hours, they need to be converted in days in order to find the difference.

If we simply find the time gap between Alex’s working hours in February and March, it can be deduced that:

= 444 – 372

= 72

So, Alex worked 72 hours more in March as compared to February. In order to get its details in days, you need to:


= 3

Hence, from this time subtraction calculator, it can be concluded that Alex worked 3 days more in March.

Users of this Time Calculator

A time calculator is a useful tool for people working in various fields. The most common users of this tool include the following: 


Freelancers are often paid on the basis of the time they have invested in completing a certain project. If your client has asked you to submit an invoice containing the exact amount according to time, you can use the clock calculator for error-free results. Easily calculate time you’ve worked to get the right payment.


A time adder is also a helpful tool for doctors. Being a doctor, you may need to evaluate time at the start of the day to manage all your chores effectively. Instead of making all calculations in your mind, you can use the online tool.


The drivers who are working professionally also need to manage their time. It is essential because they have the responsibility to make on-time deliveries. The life of a driver has become easy due to the availability of the time subtraction calculator.  Because it allows them to quickly see how much time is left in the deadline for making a delivery.

Office Employees

Office employees are responsible for attending meetings and ensuring timely completion of tasks. However, many employees face difficulty in managing time. They can avoid this hassle by using the time calculator. This tool can assist them to create their to-do list for the day.

Commonly used time units

Understanding time units are important for accurate time addition/subtraction. The following table shows some common units of time.




1,000 years


100 years


10 years

year (average)

365.242 days or 12 months

common year

365 days or 12 months

leap year

366 days or 12 months


3 months


28-31 days


7 days


24 hours or 1,440 minutes or 86,400 seconds


60 minutes or 3,600 seconds


60 seconds


base unit



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