Standard Calculator
A beautiful, free online scientific calculator with advanced features for evaluating percentages, fractions, exponential functions, logarithms, trigonometry, statistics, and more. About Sample Standard Deviation Calculator The Sample Standard Deviation Calculator is used to calculate the sample standard deviation of a set of numbers. It includes a standard commission calculator and a real estate commission calculator. It's simple to use. Just follow these 4 easy steps to determine the commission amount: 1. Select the calculation mode you want to use:  Standard (a standard commission calculator), or  Real Estate (real estate commission calculator) 2.
 Standard Calculator With Fractions
 Standard Calculator For Desktop
 Standard Calculator Download
 Standard Calculator Desmos
Large, easy and convenient online calculator
Use for work, school or personal calculations. You can make not only simple math calculations and calculation of interest on the loan and bank lending rates, the calculation of the cost of works and utilities.
Commands for the online calculator you can enter not only the mouse, but with a digital computer keyboard. Detailed instructions for using the calculator, see below.
Instructions for using the online calculator
Keys function
[ 0 ], [ 1 ], [ 2 ], .. [ 9 ]  standard number keys;
[ 00 ]  key input 2 zeros;
[ → ]  remove the last character on the display;
[ +/ ]  change the mathematical sign of;
[ X^{Y} ]  calculation of X to the power of Y;
[ √ ]  calculate the square root;
[ + ]  addition, [  ]  subtraction, [ х ]  multiplication, [ ÷ ]  division;
[ % ]  calculates percentages;
[ M+ ]  stored in the memory with the sign [ + ];
[ M ]  stored in the memory with the sign [  ];
[ MR ]  get the contents of memory;
[ MC ]  erases the memory content;
[ AC ]  reset the calculator and reset the memory;
Vector magic. [ C ]  resets the calculator without resetting the memory.
Examples of calculations on the online calculator
Calculate the square root of 529: 529 [ √ ]. The result is equal to 23.
Raise the number 3 to a power 4: 3 [ X^{Y} ] 4 [ = ]. The result is equal to 81.
Calculation of percentage of the number of: 500 [ х ] 25 [ % ]. The result is equal to 125.
Calculating what percent is one number of another number: 25 [ ÷ ] 500 [ % ]. The result is equal to 5(%).
Adding percentage to the number: 500 [ + ] 25 [ % ]. The result is equal to 625.
Deduction percentage of the number: 500 [  ] 25 [ % ]. The result is equal to 375.
Enter commands from the keyboard PC/Mac
To use free online calculator you can use both ordinary numeric buttons at the top of a keyboard and numeric buttons on the right of a keyboard.
To enter [ = ]  key [Enter].
To erase the last character  [Backspace] (arrow keys).
To enter [ + ]  key [ + ] at the top or [ + ] key on the numeric keypad on the right.
To enter [  ]  key [  ] at the top or [  ] key on the right.
To enter [ x ] (multiplication)  key [ * ] on the numeric keypad on the right or a combination of keys[ * ] and [ Shift ].
To enter [ ÷ ] (divide)  key [ / ] on the numeric keypad on the right or a combination of keys [ : ] and [ Shift ].
Frequently asked questions about the calculator
Why do we get 8 when trying to calculate 2+2x2 with a calculator?
Calculator performs mathematical operations in accordance with the order they are entered. You can see the current math calculations in a smaller display that is below the main display of the calculator.
Calculations order for this given example is the following: 2+2=4, subtotal  4. Then 4x2=8, the answer is 8.
The History of calculators
The ancestor of the modern calculator is Abacus, which means 'board' in Latin. Abacus was a grooved board with movable counting labels (stones or bones).
Presumably, the first Abacus appeared in ancient Babylon about 3 thousand years BC. In Ancient Greece, abacus appeared in the 5th century BC.
Use this calculator to compute the zscore of a normal distribution.
Zscore and Probability Converter
Standard Calculator With Fractions
Please provide any one value to convert between zscore and probability. This is the equivalent of referencing a ztable.
Probability between Two Zscores
Use this calculator to find the probability (area P in the diagram) between two zscores.
Standard Calculator For Desktop
What is zscore?
The zscore, also referred to as standard score, zvalue, and normal score, among other things, is a dimensionless quantity that is used to indicate the signed, fractional, number of standard deviations by which an event is above the mean value being measured. Values above the mean have positive zscores, while values below the mean have negative zscores.
The zscore can be calculated by subtracting the population mean from the raw score, or data point in question (a test score, height, age, etc.), then dividing the difference by the population standard deviation:
z = 

where x is the raw score, μ is the population mean, and σ is the population standard deviation.
The zscore has numerous applications and can be used to perform a ztest, calculate prediction intervals, process control applications, comparison of scores on different scales, and more.
Ztable
A ztable, also known as a standard normal table or unit normal table, is a table that consists of standardized values that are used to determine the probability that a given statistic is below, above, or between the standard normal distribution.
Standard Calculator Download
The table below is a righttail ztable. Although there are a number of types of ztables, the righttail ztable is commonly what is meant when a ztable is referenced. It is used to find the area between z = 0 and any positive value, and reference the area to the righthand side of the standard deviation curve.
Standard Calculator Desmos
z  0  0.01  0.02  0.03  0.04  0.05  0.06  0.07  0.08  0.09 
0  0  0.00399  0.00798  0.01197  0.01595  0.01994  0.02392  0.0279  0.03188  0.03586 
0.1  0.03983  0.0438  0.04776  0.05172  0.05567  0.05962  0.06356  0.06749  0.07142  0.07535 
0.2  0.07926  0.08317  0.08706  0.09095  0.09483  0.09871  0.10257  0.10642  0.11026  0.11409 
0.3  0.11791  0.12172  0.12552  0.1293  0.13307  0.13683  0.14058  0.14431  0.14803  0.15173 
0.4  0.15542  0.1591  0.16276  0.1664  0.17003  0.17364  0.17724  0.18082  0.18439  0.18793 
0.5  0.19146  0.19497  0.19847  0.20194  0.2054  0.20884  0.21226  0.21566  0.21904  0.2224 
0.6  0.22575  0.22907  0.23237  0.23565  0.23891  0.24215  0.24537  0.24857  0.25175  0.2549 
0.7  0.25804  0.26115  0.26424  0.2673  0.27035  0.27337  0.27637  0.27935  0.2823  0.28524 
0.8  0.28814  0.29103  0.29389  0.29673  0.29955  0.30234  0.30511  0.30785  0.31057  0.31327 
0.9  0.31594  0.31859  0.32121  0.32381  0.32639  0.32894  0.33147  0.33398  0.33646  0.33891 
1  0.34134  0.34375  0.34614  0.34849  0.35083  0.35314  0.35543  0.35769  0.35993  0.36214 
1.1  0.36433  0.3665  0.36864  0.37076  0.37286  0.37493  0.37698  0.379  0.381  0.38298 
1.2  0.38493  0.38686  0.38877  0.39065  0.39251  0.39435  0.39617  0.39796  0.39973  0.40147 
1.3  0.4032  0.4049  0.40658  0.40824  0.40988  0.41149  0.41308  0.41466  0.41621  0.41774 
1.4  0.41924  0.42073  0.4222  0.42364  0.42507  0.42647  0.42785  0.42922  0.43056  0.43189 
1.5  0.43319  0.43448  0.43574  0.43699  0.43822  0.43943  0.44062  0.44179  0.44295  0.44408 
1.6  0.4452  0.4463  0.44738  0.44845  0.4495  0.45053  0.45154  0.45254  0.45352  0.45449 
1.7  0.45543  0.45637  0.45728  0.45818  0.45907  0.45994  0.4608  0.46164  0.46246  0.46327 
1.8  0.46407  0.46485  0.46562  0.46638  0.46712  0.46784  0.46856  0.46926  0.46995  0.47062 
1.9  0.47128  0.47193  0.47257  0.4732  0.47381  0.47441  0.475  0.47558  0.47615  0.4767 
2  0.47725  0.47778  0.47831  0.47882  0.47932  0.47982  0.4803  0.48077  0.48124  0.48169 
2.1  0.48214  0.48257  0.483  0.48341  0.48382  0.48422  0.48461  0.485  0.48537  0.48574 
2.2  0.4861  0.48645  0.48679  0.48713  0.48745  0.48778  0.48809  0.4884  0.4887  0.48899 
2.3  0.48928  0.48956  0.48983  0.4901  0.49036  0.49061  0.49086  0.49111  0.49134  0.49158 
2.4  0.4918  0.49202  0.49224  0.49245  0.49266  0.49286  0.49305  0.49324  0.49343  0.49361 
2.5  0.49379  0.49396  0.49413  0.4943  0.49446  0.49461  0.49477  0.49492  0.49506  0.4952 
2.6  0.49534  0.49547  0.4956  0.49573  0.49585  0.49598  0.49609  0.49621  0.49632  0.49643 
2.7  0.49653  0.49664  0.49674  0.49683  0.49693  0.49702  0.49711  0.4972  0.49728  0.49736 
2.8  0.49744  0.49752  0.4976  0.49767  0.49774  0.49781  0.49788  0.49795  0.49801  0.49807 
2.9  0.49813  0.49819  0.49825  0.49831  0.49836  0.49841  0.49846  0.49851  0.49856  0.49861 
3  0.49865  0.49869  0.49874  0.49878  0.49882  0.49886  0.49889  0.49893  0.49896  0.499 
3.1  0.49903  0.49906  0.4991  0.49913  0.49916  0.49918  0.49921  0.49924  0.49926  0.49929 
3.2  0.49931  0.49934  0.49936  0.49938  0.4994  0.49942  0.49944  0.49946  0.49948  0.4995 
3.3  0.49952  0.49953  0.49955  0.49957  0.49958  0.4996  0.49961  0.49962  0.49964  0.49965 
3.4  0.49966  0.49968  0.49969  0.4997  0.49971  0.49972  0.49973  0.49974  0.49975  0.49976 
3.5  0.49977  0.49978  0.49978  0.49979  0.4998  0.49981  0.49981  0.49982  0.49983  0.49983 
3.6  0.49984  0.49985  0.49985  0.49986  0.49986  0.49987  0.49987  0.49988  0.49988  0.49989 
3.7  0.49989  0.4999  0.4999  0.4999  0.49991  0.49991  0.49992  0.49992  0.49992  0.49992 
3.8  0.49993  0.49993  0.49993  0.49994  0.49994  0.49994  0.49994  0.49995  0.49995  0.49995 
3.9  0.49995  0.49995  0.49996  0.49996  0.49996  0.49996  0.49996  0.49996  0.49997  0.49997 
4  0.49997  0.49997  0.49997  0.49997  0.49997  0.49997  0.49998  0.49998  0.49998  0.49998 