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A Tribute To The Pocket Calculators Finance Never Retired

The RPN Financial Calculator

Real estate agents, appraisers, bankers and actuaries have carried some version of this exact keyboard for generations, because reverse Polish notation is simply a faster way to think through a calculation. This is our own browser-based version, built the same way, owned by nobody but you while it's open in this tab.

If You've Never Used RPN

Numbers First, Operator Second

A normal calculator makes you type 5 + 3 =. This one makes you type 5, ENTER, 3, +, and the answer appears immediately, no equals key at all.

It feels backward for about ten minutes and then never feels like anything else again. Every value goes onto a small internal stack, and every operator immediately acts on whatever is sitting on top of it, which is exactly why long, multi-step calculations get so much faster once it clicks.

GSH · FIELD MODEL 2ND RPN
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Try A Mortgage Payment

Type 360, press n. Type 0.4167, press i (that's 5% annual, monthly). Type 300000, press PV. Type 0, press FV. Then press PMT with nothing typed, it solves for the payment.

Rotate your phone to landscape for the full-width layout this was actually designed around. On a laptop or desktop, it stays upright, the way the real thing always sat on a desk.

Quick Reference

What Each Key Actually Does

n · i · PV · PMT · FV

Type a number then press one to store it. Press one with nothing freshly typed to solve for it from the other four.

ENTER

Pushes the current value onto the stack so the next number you type doesn't overwrite it.

2ND

Unlocks the small function printed above a key: x², √x, 1/x, Δ%, and π.

x⇆y · R↓

Swaps the two values on top of the stack, or rotates all four down one position.

STO · RCL

Stores the current value into a small memory slot, or brings it back.

CLx · AC

Clears just the current entry, or resets the entire stack and every stored TVM value.

%

With a base in Y and a rate in X, computes the percentage of that base directly.

CHS

Flips the sign, essential for keeping cash outflows and inflows straight in a TVM problem.

This is an original, browser-based tribute built by GSH Financial. It is not manufactured, endorsed, or affiliated with any calculator brand, and no branded names, logos, or exact keyboard layouts have been used or reproduced. It runs entirely in your browser, nothing you type is transmitted or stored anywhere.

Prefer a screen that solves it and shows its work?

Use The Time Value Of Money Tool →