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Rounding significant figures calculator converts a given number into a new number with the desired amount of significant figures and solves expressions with sig figs.
This sig fig counter counts the significant digits or simply rounds a digit to the desired number of a significant figure.
How to use Sig Fig Calculator?
Enter the numbers and the value you want to round the number to and click calculate.
What are significant figures? Definition
Sig figs are all the digits that are additional to the magnitude of a number. To avert repetitive figures that are not significant, you can round the given number.
However, you have to be very careful lest you end up losing precision while rounding. Most of the time, rounding numbers is meant for simplicity only.
Sig Fig Rules
To determine which of the numbers are significant and which ones are not, you can use the sig fig calculator or rules of the Significant figure listed below:
The ‘0’ to the left of the decimal value is not considered significant.
Leading zeros that occur before the first decimal number are not considered significant figures.
All of the trailing zeros that are placeholders, are not to be considered significant except when the decimal point is specified.
In many contexts, trailing zeros are only displayed if they are significant: for instance, if a gauging that is precise to four decimal places (0.0001) were to be given as 12.23, then it would usually be mistaken to show that just the two of decimal places of precision are available.
Zeros that occur between nonzero digits are significant.
let's find out how many sig figs are in 1101:
According to the rule "All nonzero numbers are considered as the significant numbers" there are 3 sig figs. numbers when we combine both rules then we will get the correct answer which is 4.
All nonzero number values are significant.
It is a very simple rule that all numbers from 19 are considered significant digits.
for example: ( 011234567890 )
in the above example, there are 11 digits but have only 9 significant numbers.
How to round significant figures?
Rounding significant figures come into play when you go for mixed calculations  addition/subtraction and multiplication/division  you need to round the value for each step of calculations to the correct number of significant figures.
For instance, to calculate: $13.14 + 2.82 \times 2.5$,
After first step you’d obtain the following result: $13.14 + 7.05$.
Then, you have to round the result of multiplication to 2 significant figures. Now, just add the numbers and leave two significant figures, attaining the result of $13.14 + 7.05 = 20.19 = 20$.
Rounding Rules
 When rounding off numbers to a certain value of significant figures, do so to the closest value.
Example 1:
Round to 3 significant figures: $2.3578 \times 102$
$\mathrm{Answer:} 2.36 \times 104$
Example 2:
Round to 2 significant figures: $1.534 \times 105$
$\mathrm{Answer:} 1.5 \times 103$
 What to do if you encounter a 5?
There is an arbitrary approach to that: If the figure before 5 is odd, round up. If the figure before 5 is even, then just let it be. The argument for this is that in the path of sequences of many calculations, any errors in rounding would be averaged out.
Significant figures counter table:
Following is the table in which you can find how many significant figures are in the given number, no. of significant figures and which figures are significant.
How many significant figures are in?  No. of Significant Figures  Significant Figures 
100  1  1 
100.  3  1,0,0 
1000  1  1 
1000.  4  1,0,0,0 
1500  2  1,5 
210  2  2,1 
0.056  2  5,6 
400  1  4 
0.00120  3  1,2,0 
0.123  3  1,2,3 
207.52  5  2,0,7,5,2 
5780  3  5,7,8 
0.001070  4  1,0,7,0 
2600.38  6  2,6,0,0,3,8 
4.05  3  4,0,5 
References

Wikipedia  Significant figures

Chemistry in the Community; KendallHunt: Dubuque, IA 1988
 Engelbrecht, Nancy; et al. (1990). "Rounding Decimal Numbers to a Designated Precision" (PDF). Washington, D.C.: U.S. Department of Education.

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Loved this calculator. I am so impressed with this online Sig Fig calculator of yours.