Time Calculator - Calculator See


Time Calculator

Add or subtract elapsed time durations across days, hours, minutes, and seconds.

Calculator Inputs

hrs
First time hours.
min
First time minutes.
Math operation.
hrs
Second time hours.
min
Second time minutes.

Calculated Results

Calculated Time Result
7 Hours 45 Minutes 30 Seconds
Decimal Hours 7.76 Hours
Total Minutes 465.5 Minutes
Total Seconds 27,930 Seconds
Values calculate live as you adjust inputs.

About Time Calculator

Adds and subtracts multi-part time durations in days, hours, minutes, and seconds, with automatic sexagesimal base-60 carryover.

What is Time Calculator?

Adds and subtracts multi-part time durations in days, hours, minutes, and seconds, with automatic sexagesimal base-60 carryover.

How to Use This Calculator

  1. Enter Hours and Minutes for Time 1.
  2. Select Add or Subtract.
  3. Enter Hours and Minutes for Time 2.
  4. Review combined time.

The Mathematical Formula & Variables

Convert all values to seconds, add or subtract, then reconstruct HH:MM:SS

Step-by-Step Worked Example

Scenario: Adding 4 hrs 30 min and 3 hrs 15 min 30 sec.

  1. 4h 30m + 3h 15m 30s = 7 hours 45 minutes 30 seconds.

Result: 7h 45m 30s

Frequently Asked Questions

How does base-60 time arithmetic work?

Every 60 seconds rolls over into 1 minute, and every 60 minutes rolls over into 1 hour.