🧮 Calculator
Tap the keys or type with your keyboard.
🔬 Scientific
Trig, logs, powers, roots, factorials and memory. Turn on RPN to work like an HP calculator (ENTER, x↔y, R↓).
In RPN: type a number, press ENTER, type the next, then the operation. Example: 3 ENTER 4 + gives 7.
💱 Money exchange
Today's rates load in a moment.
📏 Measurements
Length, weight, temperature, area, speed and gas mileage.
🥄 Cooking measures
Cups, spoons, ounces, milliliters and more (US measures).
🍽️ Tip and split the bill
Works out the tip and what each person pays.
％ Percent
Three common percent questions.
🧾 Sales tax
Texas state sales tax is 6.25%; most cities add up to 2% more (8.25% total).
🏠 Loan payment
Monthly payment for a car loan or mortgage (principal and interest only).
📈 Time value of money
Like the HP-12C: fill in four of N, I/YR, PV, PMT, FV and tap Solve on the one you want. Money you pay out is negative, money you get is positive.
📋 Amortization
Uses the numbers in Time value of money above. Shows what a range of payments goes to.
| Year | Interest | Principal | Balance |
|---|
💹 NPV and IRR
Cash flows in order, first one now (usually negative), then one per period, separated by commas.
🏭 Depreciation
Straight line, declining balance and sum-of-the-years'-digits, like the HP-12C.
🔁 Interest rate conversion
Turn a yearly rate that compounds monthly (or any period) into the real yearly rate, and back.
🏷️ Markup and margin
Profit, margin and markup from cost and price, plus the price for a margin you want.
📅 Days between dates
Count the days between two dates, or work out an age.