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If you would like to be a tester for CALC 1. please contact me. You will then get notifications from the Apple Test Flight program when a new build is available. You can then download the build and give feedback before it is released. You are under no obligation and you can opt out at any time.

What's New in Version 4.50 (Graphing Calculator, November 5, 2020)

Minor updates for the latest iOS.
A new Binomial Distribution Focused Calculator is available as a free download for the Graphing Calculator version. (May 12,2021)

What's New in Version 4.40 (Graphing Calculator, May 2, 2020)

This is a major update with extensive plotting features.

Other enhancements will include:

A free update to the Financial versions will be out soon.  This will include the updates to the 1 & 2 list statistics calculators, curve fitting calculators and Basic SR "plot(x,y) and solve(x,y) keys.

What's New in Version 4.30 (Financial and Customizable, March 27, 2020)

What's New in Version 4.22 (Financial and Customizable, Jan 22, 2020)

What's New in Version 4.21 (Financial and Customizable, Dec 28, 2019)

What's New in Version 4.20 (Financial and Customizable, Dec 14, 2019)

What's New in Version 4.16 (Customizable, Jul 18, 2019)

We added a calculator function needed to support 2 new Focused Calculators:

  1. Probabilities
  2. Sports Odds

The Probabilities calculator has keys for calculating the normal, t and chi squared distributions, combinations, permutations and more.
The Sports Odds calculator will convert odds, (failures / successes), American moneyline, decimal odds to p (successes / trials).

What's New in Version 4.15 versions (June 12, 2019)

The results of the History Item when solving for a Function Calculator parameter has been changed to the value of the parameter

What's New in Version 4.11 (Financial) and 4.12 (Customizable) versions (May 30, 2019)

Financial Version:


Customizable Version:

The new features of the financial version plus these additions:

  1. 13 new probability Function Calculators for a total of 25. Discrete: Binomial, Geometric, Negative Binomial, Hypergeometric, Poisson. Continuous: Normal, Exponential, Gamma, Weibull, Log Normal, Beta, Chi-Squared, T-Distribution, F-Distribution. Many of the CDF will calculate the CDF as well as the inverse with solving.
  2. A Function Calculator “Duplicate” command has been added to allow existing calculators to be duplicated in order to customize them.
  3. A new Triangles Focused Calculator to calculate the solution of plane triangles. Enter 3 of the 6 main characteristics and this calculator will determine the best method (SSS, SAS, SSA, ASA,AAS) and calculate the rest. The status annunciators will alert you if there are 2 solutions for some SSA cases.
  4. The History item will have the values shown on the keys and more information if you wish to find the other solution:

Calculates the diameter of the triangle's circumcircle.
Another solution exists if angle 45.58
is set to 180 - 45.58 = 134.4
7.000 : Side a.
13.56 : Side b.
10.00 : Side c.
30.00 : Angle α.
104.4 : Angle β.
45.58 : Angle γ.
33.90 : The area.
14.00 : The diameter of the triangle's circumcircle.

What's New in Version 4.10 (customizable calculator. April 24, 2019)

The customizable version of CALC 1 will allow user to create the best calculator for themselves.

Without writing code users can:


By writing JavaScript code users can:

We will soon release a build to keep both the financial and customizable versions the same except for the customization features.

What's New in Version 4.06 (Financial calculator.)

Changed the key hints on the Function Calculators to "Solves for " instead of "Calculates " when solving for parameters.
Enhanced the error reporting when a Function Calculator cannot solve for a parameter.

A few videos have been added to the documentation. We hope that these videos will make learning about CALC 1 easier for our users.

What's New in Version 4.05 (January 24, 2019)

Updated the TVM calculator amortization to use C/YR.
Automatically checks for calculator updates.

What's New in Version 4.04

Updated for new iPhones.

Added a 10bii Calculator with the functions of a 10bii on a CALC 1 Focused Calculator. This brings the number of TVM calculators to 6!

What's New in Version 4.03

Added a time value of money (TVM) calculator with periodic rate and odd periods, similar to a 12C.
This is for users who want the periodic rates and odd periods of a 12C, but on a modern calculator with key previews, undo, history for verifying and sharing and amortization for arbitrary periods without changing the TVM N or PV values.

CALC 1 now has 5 TVM calculators: 2 CALC 1 Focused Calculators, 2 HP reproductions, (12C and 10bii) and a TVM calculator on a form.

New calculator key layouts with 'spell' key on most of them.
Example: Spell Out of : 1234
one thousand two hundred thirty-four
The spell out key is useful for reports, contracts...

What's New in Version 4.02

Added a "All Updates" button to the downloads to make updating calculators easier.

What's New in Version 4.01

This was just an update of the Focused Calculators to make the secondary keys more consistent.
These are the keys usually on row 3, '1/x', '^', '(', ')'. 'EE'.

The 'spell' key on was added to most calculators.
Example: Spell Out of : 1234
one thousand two hundred thirty-four

The spell out key is useful for reports, contracts..

What's New in Version 4.0 (August 17, 2018)

Version 4 is the largest re-write of CALC 1 since it was introduced in 2010. CALC 1 now uses JavaScript so future customizable versions will be more powerful than anything possible with previous versions of CALC 1 or other programmable calculators.

Missing from version 4 is the level of customization that was in the previous versions of CALC 1. I plan to add these features soon. CALC 1 now uses JavaScript so the customization scripts can be much more powerful than in the previous versions! We have learned a lot about calculator customization and we have done extensive work on the structure of CALC 1 to make the customization more maintainable for the users.

What's New in Version 3.5 (April 4, 2017)

Version 3.5 adds a HP 10bii reproduction to CALC 1.

What's New in Version 3.4.2

Version 3.4.2 adds a new formatting option to not show trailing zeros.

What's New in Version 3.4.1

Version 3.4.1 adds button text sizing to the styles options and a full landscape calculator layout to plus size iPhones.

What's New in Version 3.4 (October 26, 2016)

Version 3.4 adds a HP 12C reproduction to CALC 1.


iOS features:

Also included are two CALC 1 versions of the 12C TVM calculators:

Time Value of Money with Odd Periods and Simple Interest Calculator
Time Value of Money with Odd Periods and Compound Interest Calculator

What's New in Version 3.3.2

What's New in Version 3.3.1

Version 3.3.1 adds minor additions to the K key (for repetitive chain calculations.), restoring inputs from history and calculator duplication.

What's New in Version 3.3 (July 19, 2016)

This update brings the HP 10bii+ functions to CALC 1.


What's New in Version 3.2 (March 19, 2016)

What's New in Version 3.1 (Feb 7, 2016)

This version adds the chain calculation mode, popular with business and financial users.

The CALC 1 Chain Calculation Mode Includes:

CALC 1 Users Now Have the Choice Of:

See Chain Calculations Using the Chain (CHN) Calculation Mode.

If you are upgrading from a previous version of CALC 1, be sure to download the updated Focused Calculators. Also include the "Formula Calculators" download. Copy and paste this as the Formula Calculator "non-formula" keys, then delete it from the Focused Calculator list.

If you have Free CALC 1, download the updated Focused Calculators. If you haven't purchased any in app purchases, just delete your old version and download the latest version.

What's New in Version 3.0.2

Minor updates:
Turning on key clicks no longer mutes music.
Auto STO is no longer optional. It is always on.

What's New in Version 3.0.1

A +/- key was added to the formula mode keyboard and replaced the (-) key. This will allow numbers to be negated anytime while they are being entered.

The Calculator Editor takes into account the changes in ALG/RPN mode.

Minor changes to some of the calculators. Some were missing the "=" command to automatically evaluate a pending expressing. Just tap the "Downloads" button in the calculator list, then "all" then "Download and Replace" to update your calculators.

What's New in Version 3.0 (Dec 12, 2015)

Version 3 is not an automatic update to version 2.8.7. You can copy and paste calculators and keys from CALC 1 v2.x to v3.

Algebraic formula lock. Users now have a new "Calculation Mode" option, RPN or ALG. This gives users a full time algebraic mode. This is an enhancement of the formula mode from version 2 in that you have the formula and last result in the display. Also, starting a formula with a +, -, * , / or ^ operator will insert "rgX()" ("last" or "ans" in some other calculators) before the operator for quick calculations involving the last result. Using Auto STO, the keystrokes for using Formula Calculators is the same for ALG and RPN mode. See Calculations Using Algebraic Formulas for details. The Algebraic calculator from version 2 is not on version 3.

"%" has been added as an operator in formulas so formulas "123 + 5%=" can be used.

Downloads update. The list of available downloads now have separate sections. The Updates section will show the list of newer versions of calculators you have. The other section will show calculators that are available that are not installed. Available downloads that are not newer than what you have installed will not be shown. Instead of downloading calculators one at a time, you select the calculators to download (a check will appear) and tap a toolbar button to either download the checked calculators or download them and then replace the old version. The "All" button will select all updates. See Downloads for details.

New graphing framework. This has improved gestures for zooming and panning and will allow more graphs in future releases. See Formula Graphing for more information.

Significant digits number format option. This will display the set number of significant digits instead of decimal places. See Options for details.

New Formula Calculators: Percent Of Total, Permutations, Combinations and Kelly Bet.

What's New in Version 2.8.7 (Aug 12, 2015)

New name, CALC 1, and icon.

The iPhone toolbar can now be shown in portrait mode on the iPhone. The buttons for the currency and UOM conversions have been added so users have quick access to all 5 utility screens (currency conversion, UOM conversions, History List, List Manager and Options) .

The toolbar has been added to the Algebraic Calculator so users now have conversions available from that calculator.

Imperial gallons, pints and ounces have been added to the volume UOM conversions.

What's New in version 2.8.6 (May 14, 2015)

This version contains major upgrades to the Formula Calculators to make them more powerful than ever!

Graphing has also been added to the Amortization Form Calculator.

The new custom keyboard also makes it easier to enter values for the Form Calculators input values.

What's New in version 2.8.5 (March 27, 2015)

Enhancements to the Algebraic Calculator:

When an operator is the first entry of a formula, "ans" is inserted in front of the operator.
Repeated tapping of the "=" for formulas with "ans" (ans + 1, for example) will re-evaluate the formula with the updated value for "ans".

The picker for the UOM and currency conversion selection has been replaced with a larger table style picker.

What's New in version 2.8.4 (March 14, 2015)

New Form Calculators

This version features 3 new Form Calculators:

  1. Currency Conversions
  2. UOM Conversions
  3. Dates

Currency Conversions and UOM Conversions can be quickly accessed by tapping or double-tapping the CALC 1 logo on any Focused or Formula Calculator.

The conversion calculators have a new "Create Key" button. This will automatically create a key for that conversion that you can paste into any Focused Calculator.

Double tapping the CALC 1 logo now displays the UOM Conversions instead of increasing the number of rows displayed. There is a new swipe up/down gesture on the display to increase and decrease the number of rows displayed. This allows you to increase or decrease the number of rows, instead of only decreasing them.

Amortization Form Calculator Upgrade

The Amortization Form Calculator now has a "Date of First Payment" date picker. Selecting this date will label each payment of the results with the year and month. An annual summary will also be created.

The Amortization and Depreciation results view now allows the user to increase or decrease the text size to better fit their device and the values.

What's New in version 2.8.3

Version 2.8.3 is a release for Free CALC 1. It is the same as CALC 1 2.8.2 except for iAds and In-App Purchases.

What's New in version 2.8.2 (Feb 15, 2015)

Fixed the issue :When using an iPhone 6 Plus in landscape mode: Using the f() key to display the lists of functions in formula mode, the list of functions does not present itself correctly and it will not close after selecting a function. The workaround is to place the phone in portrait mode.

Auto STO is now turned on by default for new installations.

The TVM I/YR Focused Calculator is the default calculator for new installations.

What's New in version 2.8.1 (Jan 28, 2015)

Auto STO (AS) option

Rename Financial: TVM PYR CYR to TVM IYR: This is just a new name for that calculator. This is available by Downloading it.

A new key was added to TVM I/YR, "RndPmt" when the shift key is pressed. Since PMT is calculated to many decimal places, you need to round the payment if you want to calculate the FV. In the past, you would recall the payment, then round it, then store the rounded value. This new key does this with one key.

Fixed Link to Rate CALC 1: The old link was wrong.

Stack size bug when rotating: Sometimes the stack number values took more than one row after rotating to landscape or portrait. This has been resolved.

Formula mode, smaller font: When you enter a formula in a focused or formula calculator that is larger than the text area, the font size with automatically be reduced.

Added the reload button to the help page view: Help pages are cached to save time and date usage. The reload button allows users to reload pages that look like they might be out of date. With a new release, a lot of help pages are being updated.

New Formula Calculators: These can be Downloaded from the Formula Calculator list.

  1. Black-Scholes Call
  2. Black-Scholes Put
  3. Effective Interest Rate-Continuous

Issue with 2.8.1

When using an iPhone 6 Plus in landscape mode: Using the f() key to display the lists of functions in formula mode, the list of functions does not present itself correctly and it will not close after selecting a function. The workaround is to place the phone in portrait mode.

What's New in Version 2.8 (Jan 13, 2015)

Version 2.8 has been updated for iOS "adaptive interfaces" (Supporting any size display or orientation of a device).

The History List has been updated to recall the results of past calculations.

The info buttons

has been replaced with "help"

buttons for on-line help for CALC 1.

Apple used the info button for "more information" and details about an item.

The info button is now used to display the calculator editors and history details.