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 new Data Manager to
store and edit lists / arrays and other JSON data.
- Import of text files (from the Files app) to the Data Manager.
Values can then be parsed to the List Manager. See the Data
- Solve, integrate, dydx, max, min functions for expressions.
Also evaluate where expression 1 = expression 2.
- STO / RCL of lists to the Data Manager or one of 8 global lists for
virtually unlimited list storage!
- STO / RCL of expressions.
- New Normal
t Distribution calculators with z/t tests, intervals and
- Plotting (box plots, histograms) and other enhancements added to
the 1 List
and 2 List
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,
- Plots now use System Colors that adjust to dark mode and
automatically adapt to changes in accessibility settings like Increase
- All of the parameter values are now shown on the plots from the
- A new toolbar button will quickly display the latest History Detail.
- A new expression editor allows full keyboard editing of algebraic
- Expressions can be restored from History.
What's New in Version 4.22 (Financial and Customizable, Jan 22, 2020)
- A Search Bar has been added to the Function Calculator list.
- A button to automatically create a Function Calculator from an
algebraic expression has been added. This is an easy way turn an
expression into a Function Calculator so the function can be plotted
and you can solve for “x” as well calculate “f(x)” for different
values of ‘x’. See History
and Sharing for more details.
What's New in Version 4.21 (Financial and Customizable, Dec 28, 2019)
- This version contains support for external keyboards.
- Numeric entry (0-9) and most expressions (+, -, *, /) can be
performed with an external keyboard on the CALC 1 calculators and the
- See the Keyboard
Support page under the Getting
Started section of the documentation.
- The custom keyboard for text fields is no longer included. It is no
longer necessary for version 4.
What's New in Version 4.20 (Financial and Customizable, Dec 14, 2019)
- This update covers the changes for iOS 13 (support for Dark and
- Amortization has been added TVM
- The Bonds and Depreciation
Form Calculators user interfaces have been updated to "Table Views" to
make them better adopt to different devices and sizes. Now all Form
Calculators use Table Views.
- The simple Loan
Form Calculator has been discontinued.
What's New in Version 4.16 (Customizable, Jul 18, 2019)
We added a calculator function needed to support 2 new Focused
- 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)
- 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
- This STO/RCL “object” feature has also been added tot
- 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
- 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
The new features of the financial version plus these additions:
- 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.
- A Function
Calculator “Duplicate” command has been added to allow existing
calculators to be duplicated in order to customize them.
- 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
- 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:
- Create new calculators and copy and paste keys from existing
calculators to create a custom calculator.
- Enter an expression in the ALG calculation mode and then use the
"Create Key" button in the History Detail to automatically create a
key to paste into one of your custom calculators.
- Use the "Create Key" button on the UOM or Currency Conversion Form
Calculators to create keys to perform conversion with the tap of a
button found on the Function Calculator list. Or you can build and
test the function using the Function Calculator.
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 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
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
more powerful than anything possible with previous versions of CALC 1 or
other programmable calculators.
- Calculators now have 8 rows instead of 7.
- History details are now more readable reports.
- History details now use iOS Share activities so in addition to copy,
print and email, the report can be sent to Notes, Messages and more.
- A new Styles system that saves multiple custom styles.
- Fraction formatting and display.
- Calculators are now aware of the Calculation Mode so RPN users have
more function keys instead of parenthesis keys.
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
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
What's New in Version 3.5 (April 4, 2017)
Version 3.5 adds a HP
10bii reproduction to CALC 1.
- The 10bii and CALC 1 share the stack and TVM values to make it easy
to switch between the classic calculator you are familiar with and
over 100 powerful, easy, complete and customizable CALC 1 calculators.
- Haptic feedback has been added to the calculator buttons for tactile
feedback. This is only for devices that support haptic feedback.
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.
- This is the Platinum version with RPN, ALG with parenthesis, undo,
single digit delete and 400 program steps.
- The 12CP and CALC 1 share the stack and TVM values to make it easy
to switch between the classic calculator you are familiar with and
over 100 powerful, easy, complete and customizable CALC 1 calculators.
- Dynamic Type so users can change the size of the text on the display
and buttons on the 12CP. (iOS 10 only)
- Adaptive layout for landscape, portrait, plus size iPhones and i
Pads with slide over and split view.
- Copy and paste 12CP programs!
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
What's New in Version 3.3.2
- Version 3.3.2 saves calculators to the History list
when they are deleted manually or by updates. The history item can
then be restored. This protects your customized calculators from
- You can also mail calculators from the
calculator list and open them from mail. This allows you to
share calculators and provides a way to archive your custom
- A new user
option function to set the "Use Significant Digits" options
from a key has been added.
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
What's New in Version 3.3 (July 19, 2016)
This update brings the HP 10bii+ functions to CALC 1.
- Restore Inputs from
History. All calculation inputs are saved and can be
restored. This applies to any Formula Calculator and Focused and Form
Calculators (TVM, amortization) This also restores statistics and cash
flow lists of data!
- Calculation History Items can be kept and renamed.
- Calculation History Items can be copied with statistical lists.
- List Manager XY tab that
allows editing and copy and paste for x-y values.
Normal distributions for a total of 5 distributions (Normal, Log
Normal, Student T, Binomial, Poisson).
- CALC 1 now has 12 statistical distribution calculators for PMF/PDF,
lower tail, upper tail, two tail and two value so you don't have to do
the conversions. Since CALC 1 Formula Calculators are solvers, you not
only have the standard inverse function for x, but also mean and
- Duplicate any
calculator with a left swipe from the calculator list. This allows you
to quickly create calculators to compare scenarios.
- With this release CALC 1 has 24 Focused
and over 60 Formula
- New standard system key click sound.
What's New in Version 3.2 (March 19, 2016)
- This version adds a new "Key Preview” option.
This new option will display a value on applicable keys. Some iOS
calculators have this for TVM values but CALC 1 previews the value for
TVM, Bonds, all of the Formula Calculators and all of the STO/RCL
keys. So now when you tap STO/RCL you see what values are currently
stored and the storage variables that are available.
- Chain calculations undo is available for all operators that cause a
calculation, and not just = as before. So now you can undo and redo
all of the steps of a long calculation.
- New screens and key styles.
- Form Calculators now log to the History list.
- New iPhone option to allow
key editing from calculators by swiping the key (right swipe gesture).
This makes it easier to copy/paste/edit keys to be more productive.
- Trivial formulas (rgX(), rgY()) that are used to lift and drop the
stack are no longer recorded in the history details.
- Added Cup and troy oz to UOM conversions.
- Minor enhancements to chain mode entering.
- Changed underflow so in the default Decimal, 2 digits, 0.001 is
displayed as 0.001 instead of 1.0E-3. This is common in business and
- Changed overflows to use as many digits as will fit when displaying
the value in scientific notation.
- iOS 9.1 is now the minimum iOS.
What's New in Version 3.1 (Feb 7, 2016)
This version adds the chain calculation mode, popular with business and
The CALC 1 Chain Calculation Mode Includes:
- Immediate execution.
- Parenthesis to control the order of operation.
- Quickly include previous results from the automatic stack, history
or "RCL" memory.
- Undo support to make it easy to recover from mistakes.
CALC 1 Users Now Have the Choice Of:
- Chain - For basic to moderate calculations.
- Algebraic - Powerful, spreadsheet compatible, for
more difficult calculations.
- RPN - Efficient, parenthesis free.
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
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
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
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,
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
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 been added to
the Formula Calculators. You can now graph formulas as a function of
any of the independent variables.
- A new custom keyboard that makes entering formulas for Formula
Calculators and custom keys easier. You can also use it to enter
values and formulas for Form Calculators.
- You can now edit, copy and paste the Formula Calculator keys that
are not part of the formula to add more functions you need to the
- New Formula Calculators: Present
Value and Annual
Cost Of Lighting.
- The Formula Calculator key labels no longer need to match the
variable name for that key. This allows you to use symbols like the %
sign as key labels.
- Version number and version changes fields have been added to Focused
and Formula Calculators. This will allow updates to be identified.
- A Documentation URL field has been added so the URL is not derived
from the name.
- The free Formula Calculators have been updated for the new features.
Graphing has also been added to the Amortization
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
- UOM Conversions
Currency Conversions and UOM Conversions can be quickly accessed by
tapping or double-tapping the CALC 1 logo on any Focused or Formula
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
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
Auto STO is now turned on by
default for new installations.
The TVM I/YR Focused Calculator is the default calculator for new
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
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
New Formula Calculators: These can be Downloaded
from the Formula Calculator list.
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
Apple used the info button for "more information" and details about an
The info button is now used to display the calculator editors and