Options menu

In the Options menu you can change parameters like calculation mode, precision, etcetera. Selected options are saved on your computer.

Exchange rates

Convert currencies by pressing x. You can reverse the calculation (from foreign currency to base currency) by first pressing z. Set base currency with y. The up-to-date currency rates are imported when you start the calculator or when you change base currency. The rates are downloaded from the European Central Bank or from Yahoo Finance.



The stack-calculator lets you easily work with hours:minutes and hours:minutes:seconds (or degrees with minutes and seconds). Use : (or more easy ; ) to enter minutes and an optional second time to enter seconds. E.g. enter 12:53:18 for 12h53m18s (this will be converted to 12.88333). Use Notations, format hms or hm to display and calculate with min/sec.


  • sin(34°12')=0.562 -> enter 34:12 and press a s (make sure you work with degrees instead of radian).
  • 34°12'56'' + 17°51'18'' = 52°04'14'' -> enter 34:12:56 + 17:51:18 = (make sure you work with h:m:s-notation)
  • Convert 23°22'13'' to decimal degrees -> enter 23:22:13 (make sure notation is normal).

Hexadecimal, octal, binary numbers

Use z Notation and choose hex, oct or bin to display hexadecimal, octal or binary numbers. Enter hex number by starting with 0x e.g. 0x10 to enter decimal 16. Enter octal numbers with 0o.. and binary numbers with 0b.. This also works with Notation on normal. The number is then directly converted to decimal.


Use z Notation fraction to display numbers as fractions. Enter a fraction with \, e.g. 3\4. The maximum number of digits of the denominator is defined by the set precision (Options Precision). See for example how π (pi) is displayed as a fraction depending on the set precision (22\7, 311\99, 355\113, 312689\99532, etc). The entry of fractions also works with other notations. The fraction is then directly converted to the set notation.

Complex numbers

You can calculate with complex numbers, both in rectangular format (a+bi+) and in polar format (r<φ). Set the right notation (z).You can enter complex numbers in the form (a+bi), or [a+bi (the closing bracket can be omitted). For polar notation you enter r<φ, e.g. 5.1<1.2. The angle in radian or degrees (set in o Options). By changing the notation you can easily convert polar to/from rectangular. The standard arithmetic operations are supported, but also exponential, logarithmic and trig functions.


Last answers

The result of every calculation is stored in the Last Answers register. So to enter a previously calculated value simply press l and select the required value. Last answers are saved on your computer.


For most of the calculations the RPN stack is sufficient. But sometimes you want to store (intermediate) results. For this you can use the Memory block. Just press m to store the value from the x-stack to the first free memory place. Or use s followed by a character to store it on a specific place. Use r followed by a character to recall a number. The Memory block is also used for cashflow calculations. All stack values (in RPN-mode), last answers and memories are saved on your computer.


You can use the calculator for three types of financial calculations: CAGR (Compound Average Growth Rate), Annuity and Cashflow.


Enter 3 out of 4 variables to calculate the unknown variable.


Enter 3 out of 4 variables to calculate the unknown variable. If you have also given the payment number x you can also calculate financial values for that number.


Use the memory block to store the cashflows, starting at place 0. Take care that cashout values have a negative sign and cashin values a positive sign.


Enter physical constants by pressing g.


Select unit conversion by pressing v.