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Reversed Polish Notation Calculator (стековый калькулятор с комментариями на русском)

See also an upgraded version

The result will appear here.

Please enter space-separated numbers and operations. Use decimal point to separate fractional part. Commas are ignored and can be used to group digits, as in 1,000,000.99.

Each operation takes its usual (varying depending on the operation) number of arguments. In particular, the constants are viewed as operations with zero arguments. This calculator does not check if the arguments belong to the domain of operation. So, for example, you will get the result "NaN" instead of error if you try to compute "-4 sqrt".

To compute your expression, press the "compute" button or hit the "Enter" key.