CALC 1 give users clean reproductions of the 12C and 10bII that they will feel comfortable with immediately.

Since CALC 1 contains so many tools, we did not need to add anything to the reproductions. We just share the stack, TVM values and some storage registers so the user can switch between the reproductions and the many CALC 1 tools.

So the AMORT key on our 10bII calculates interest, principle and balance just like the hardware 10bII. If you want an amortization table or graph, CALC 1 has a separate form you use that will already have the TVM values from the 10bII entered (number of periods, PV, payment). Then you can quickly generate either a periodic or annual table or graph that can be shared.

In addition to the 12C and 10bII reproductions, CALC 1 has other calculators that take the best features of these, and other classic calculators, and combines them with the great tools available on the iPhone and iPad.

CALC 1 has separate calculators for TVM, cash flows, business percentages, statistics, math functions that share data with the reproductions.

CALC 1 also has Function Calculators that provide a consistent and efficient solution to a wide range of financial, business, probability and statistical problems. You can also easily create a graph of the function by entering the range and selecting the independent variable. Solving for a parameter allows you to perform breakeven analysis for any parameter of any function.

The modern features of the CALC 1 calculators include:

Key preview show values on the keys for ALL store or calculate keys.
- Press and hold any key for a hint.
- Lift your finger outside of a key to cancel.
- Great undo support for keys and expressions.
- Chain, algebraic and RPN calculation methods.
- Display 1-4 lines of the stack in the display by swiping up or down.
- Fixed, significant digits and fractions display formats.
- Pinch to quickly change the number of digits.
- Swipe left or right to change CALC 1 calculators.
- History so you can review and share calculations.
- A List Manager to review and edit statistics and cash flow values.
- UOM and currency conversions.
- Customize the list of CALC 1 calculators to your requirements with free downloads.
- Context sensitive documentation and examples for every calculator and utility.
- Video explainers.

If you have any more questions, we have over 100 pages of documentation, examples and videos found at the “App Support” link.

What’s New

Version 415

The CALC 1 TVM Focused Calculators have been updated with STO/RLC of all of the TVM values (N, I/YR, PV, PMT, FV, P/YR, C/YR, PER1, PER2 BEG/END) at once! Now you can STO different initial values or quickly switch between different scenarios.
This STO/RCL “object” feature has also been added to the Ratios Focused Calculator.
We enhanced the status annunciators to display all the values not shown on the key previews. So instead of just BEG mode the P/YR, PER1 PER2 are displayed.
Each status annunciator is specific to the Focused Calculator so, for example, BEG, P/YR are only shown on the financial calculators that use them and DEG is only shown on calculators with trigonometry functions.
For version 4.15: The results of the History Item when solving for a Function Calculator parameter has been changed to the value of the parameter.

Ratings and Reviews

3.5 out of 5
15 Ratings

15 Ratings

Imhotep VII ,


I usually use an HP 12CP but this has replaced that long standing relationship. Seeing the value on the keys is worth the price of admission. I am amazed by the scope of this app. HP should hire the developer to design their next product.

Tbillhastings ,

Doesn’t CALC correctly

I have been using the HP 12C for 30 years, and thought this app could replace the hardware. Nope! It simply doesn’t calculate correctly, sometimes returning different answers on the same data entry. Shame on these guys.

Developer Response ,

You are mistaken. The 12C reproduction will calculate EVERY example in the 12C manual correctly. You should provide a reproducible example to back up your claims. If you have a problem you can use the "Contact" form from the documentation to contact the developer for help.


Roger Carey
12.3 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like