Date Difference Calculator
Calculators
Count the days between two dates, then see weeks and a calendar span in years, months, and days.
Time Calculator
Add or subtract hours and minutes, then read the total as hours, minutes, and total minutes.
What is Time Calculator?
A time calculator adds or subtracts hours and minutes and shows the result as hours, leftover minutes, and total minutes.
Loading tool…
This tool runs in your browser. Inputs, files and generated values stay on this device. Favorites and recently used tools, if you use them, store only tool names in local storage — never passwords, documents or QR contents. See the privacy policy.
What this tool does
Add or subtract one block of hours and minutes from another. The result is hours and leftover minutes, plus the signed total in minutes. This is duration arithmetic. It does not look up a clock, a date, or a time zone.
How to use
- Enter the starting hours and minutes. Both must be whole numbers, zero or greater.
- Enter the hours and minutes to add or subtract.
- Choose Add or Subtract, then press Calculate.
Examples
Two and a half hours plus 1 hour 45 minutes
2 hours 30 minutes plus 1 hour 45 minutes is 4 hours 15 minutes, which is 255 minutes.
Subtracting more than the start
1 hour 0 minutes minus 1 hour 30 minutes is minus 0 hours 30 minutes, which is -30 minutes.
Main features
- Minutes of 60 or more are carried into hours.
- A result below zero is marked minus and still shows the remaining hours and minutes.
- Total minutes, so you can check the arithmetic.
How it works
Each side is turned into minutes, the second side is added or subtracted, and the signed total is split back into hours and leftover minutes. This is duration arithmetic. It does not look up a clock, a date, or a time zone.
Tips
- Type 90 in the minutes box if you do not want to convert it to 1 hour 30 minutes first. The page carries the extra minutes.
- Use the Date Difference Calculator when the question is days between two calendar dates.
Limitations
Hours and minutes must be whole numbers from 0 through 100,000. A blank box is rejected. Decimals and negative inputs are rejected. The page does not convert time zones.
See the disclaimer for what these tools do not cover.
FAQ
- Is the Time Calculator free?
- Yes. You can add or subtract hours and minutes here without paying or creating an account.
- What if the minutes are 60 or more?
- They are included in the total and then shown as hours plus a remainder from 0 to 59.
- Can the result be negative?
- Yes, when you subtract more than the starting duration. The page marks that result as minus.
- Are these numbers sent to a server?
- No. The hours and minutes are calculated in this browser tab. Tools Star Hub does not send those numbers to a server or save them in local storage.
Related tools
Time Zone Converter
Developer Tools
Convert a date and time between two time zones using the browser time-zone list.
Unix Timestamp Converter
Developer Tools
Convert Unix timestamps to dates and dates back to timestamps, in seconds or milliseconds.
Percentage Calculator
Calculators
Find percentages, increases, decreases and what percent one number is of another.
Percentage Change Calculator
Calculators
Compare an original number with a new one and see the percent change. From 80 to 100 is a 25% rise; 100 back to 80 is a 20% drop. An original of 0 is rejected.
Discount Calculator
Calculators
Take a percent off a price and see the amount saved and what you pay. Type plain numbers. A currency symbol is invalid, and a discount above 100% is rejected.
Helpful guides
Guide
How to Add or Subtract Hours and Minutes
Add or subtract hours and minutes by converting both sides to minutes, then splitting the signed total back into hours and a remainder.
Read guideGuide
How to Click Faster: Average CPS, Jitter and Butterfly Clicking
How to click faster: the average CPS, a CPS rating table, and how regular, jitter, butterfly, and drag clicking compare, plus mouse tips and wrist safety.
Read guide