MISTAKE in calculations

SavaS

New Member
Joined
May 27, 2021
Messages
1
Office Version
  1. 2010
Platform
  1. Windows
At first sorry for my bad English. I'm not English speaker.
I do not understand why Excel show small amount in calculations instead zero.
For example:
Open new workbook, cells format as General, enter digits by keyboard (i mean formula use just in answer cell G1)

Cell A1 - enter 26.58
Cell B1 - enter 2.18
Cell C1 - empty cell
Cell D1 - enter 22.87
Cell E1 - enter 0.2
Cell F1 - enter 1.33
Cell G1 - formula =A1-B1-C1-D1-E1-F1
get an answer -2.44249E-15 WHY???? Why not zero?

I tried with another digits
Cell A1 - enter 30.61
Cell B1 - enter 2.44
Cell C1 - empty cell
Cell D1 - enter 24.64
Cell E1 - enter 0.1
Cell F1 - enter 3.43
Answer is correct. Get zero.

Could anyone explain this. THANK YOU!!!!
 

Excel Facts

Why are there 1,048,576 rows in Excel?
The Excel team increased the size of the grid in 2007. There are 2^20 rows and 2^14 columns for a total of 17 billion cells.

Eric W

MrExcel MVP
Joined
Aug 18, 2015
Messages
11,686
Welcome to the MrExcel forum!

The issue is how Excel stores floating point numbers. In short, Excel stores numbers in binary (a combination of 1s and 0s), and when you store numbers that way, they may not exactly equal the number in decimal. Here's an article that explains more:


One way around it is to use ROUND when doing comparisons. You can also use the Precision as Displayed option, although that has some issues too.
 

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