The last calculator you need.

Par is a full RPN financial calculator that follows the classic gold-key keystrokes, so the steps you learned years ago, or find in any finance textbook, work exactly as written.

Download on the App Store

For iPhone and iPad. No ads, no account, no tracking.

Par on iPhone in light mode, with the Y register shown above the display and the full keypad

Par in dark mode with f pending, so the keys show their orange f functions such as AMORT, NPV and IRR

Same keys. Same answers.

A 30-year, $200,000 mortgage at 6% a year, keyed in exactly as the textbook says:

30gn 6gi 200000PVPMT −1,199.10

Par is checked against more than 80 worked examples from the classic financial calculator handbook, with 10-digit accuracy and the same rounding.

Everything on the faceplate, and then some

Every financial, statistical and programming function you expect, with the parts a calculator usually hides put on screen.

PMT

Time value of money

Solve for n, i, PV, PMT or FV, with payments at the beginning or end, odd first periods, and monthly shortcuts.

AMORT

Amortization

Interest, principal and remaining balance for any range of payments.

IRR

NPV and IRR

Group repeated flows, review and change any flow, and watch the cash-flow diagram draw itself.

YTM

Bonds, depreciation, dates

Bond price and yield, three depreciation methods, future dates with the weekday, and days between dates.

Σ+

Statistics and math

Mean, standard deviation, weighted mean, linear estimates, percentages, powers, logarithms and factorials.

R/S

Programmable

Up to 99 lines with branching, loops, pauses and tests. Step through and edit in place.

See the whole stack

X, Y, Z and T are always visible. On iPad, the TVM, cash flow, storage and program registers sit beside the keypad, and a history of every calculation is one tap away.

Par on iPad in landscape: a cash-flow diagram with an NPV of 212.18 beside the stack and a 10 by 4 keypad

Made for iPhone and iPad

Learn as you go

Lessons walk you through real problems, and every key has help, including its f and g functions.

Siri and Shortcuts

Ask for a loan payment, investment growth or the days between two dates, without opening the app.

Accessible

VoiceOver, Voice Control, larger text and Increase Contrast. Light and dark mode, portrait and landscape, and a hardware keyboard.

Your numbers stay yours

Par has no account, no ads and no tracking. Your calculations, registers and programs are kept on your device. Read the privacy policy.