Add Hours and Minutes Calculator

Add Hours Minutes Calculator Sign

This calculator will add up hours and minutes for any number of time blocks, and convert minutes to decimal numbers at the same time.

You can also set the calculator to auto-tab to the next field upon entering a customizable number of digits. Plus, when auto-tab is turned on, new rows will be added as you need them.

Finally, you can save your entries in between visits using the "Data" save feature, or print a formatted report.

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Add Hours Minutes Calculator

Add hours and minutes and convert minutes to 100ths of hours.

Special Instructions

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Selected Data Record:

A Data Record is a set of calculator entries that are stored in your web browser's Local Storage. If a Data Record is currently selected in the "Data" tab, this line will list the name you gave to that data record. If no data record is selected, or you have no entries stored for this calculator, the line will display "None".

DataData recordData recordSelected data record: None
Auto tab:


If you want to auto tab out of fields when the number of digits is met, tap the "On" option. Otherwise, to force manually tabbing out of fields, tap the "Off" option.

Note that when auto-tab is turned on, new rows will automatically be added as you need them.

Hr digits:Hour digits:Hour digits for auto-tab:Hour digits to trigger auto-tab:

Hour digits for auto-tab:

If the hours you will be entering are all single digits, select "Single" to auto-tab to minutes field with each hour entry. Otherwise, if you will be entering any double digit hours, select "Double" to auto-tab to minutes field only when 2 digits are entered (you will need to manually tab for single digit hour entries).


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Help and Tools


How to add hours and minutes and a bonus calculator for adding hours, minutes, and seconds.

How to Add Time

Because one hour is equal to sixty minutes, not one-hundred minutes, to add hours and minutes, you need first to convert the minute portion to a decimal number.

To convert the number of minutes to a decimal number, you divide the number of minutes by 60. So if the number of minutes was 15, the decimal equivalent would be 0.25 (15 ÷ 60 = 0.25).

Here is an example of how you would add the following hours and minutes:

Hours:MinutesMinutes / 60HH.HH

To convert the decimal total back to the normal hours and minutes format (HH:MM), you multiply the decimal portion by 60. So in the above example, you would multiply 60 by .20, giving you 10:12 (10 hours and 12 minutes).

Add Hours, Minutes, and Seconds

You can use the following calculator to add hours, minutes, and seconds. The calculator converts all entered hours, minutes, and seconds into seconds, adds up the total seconds, and then converts that result back into hours, minutes, and seconds.

Hours Minutes Seconds Calculator

Adjust Calculator Width:

Move the slider to left and right to adjust the calculator width. Note that the Help and Tools panel will be hidden when the calculator is too wide to fit both on the screen. Moving the slider to the left will bring the instructions and tools panel back into view.

Also note that some calculators will reformat to accommodate the screen size as you make the calculator wider or narrower. If the calculator is narrow, columns of entry rows will be converted to a vertical entry form, whereas a wider calculator will display columns of entry rows, and the entry fields will be smaller in size ... since they will not need to be "thumb friendly".

Show/Hide Popup Keypads:

Select Show or Hide to show or hide the popup keypad icons located next to numeric entry fields. These are generally only needed for mobile devices that don't have decimal points in their numeric keypads. So if you are on a desktop, you may find the calculator to be more user-friendly and less cluttered without them.

Stick/Unstick Tools:

Select Stick or Unstick to stick or unstick the help and tools panel. Selecting "Stick" will keep the panel in view while scrolling the calculator vertically. If you find that annoying, select "Unstick" to keep the panel in a stationary position.

If the tools panel becomes "Unstuck" on its own, try clicking "Unstick" and then "Stick" to re-stick the panel.