All in One Smart Calculator

Simple to use, with every function you actually need — everyday math, real formulas, a math workbook, unit conversion, and itemized quotes you can send as a PDF.

■ Calculator
• Arithmetic, percentage, sign toggle
• Scientific functions (sin, cos, tan, log, ln, √, powers, π, e, parentheses) in degrees or radians
• Memory keys (M+, M-, MR, MC)
• See the result before you press =

■ History and favorites
• Saves up to 100 calculations automatically
• Star favorites, add a memo and search by memo or amount (Pro)
• Export as text

■ Math workbook (new)
• 160 middle and high school problems in four topics: linear equations, quadratics, Pythagoras and trigonometry, probability and statistics
• 25 problems per round, multiple choice and written answers mixed, graded all at once at the end
• Tap a missed problem to see the steps
• On supported devices, Apple Intelligence explains the steps in plain words, on device

■ Formula book (interactive)
• 81 formulas across geometry, finance, trigonometry and algebra, physics, and astronomy
• Enter values and it calculates on the spot
• Each formula has a how-to sheet and its history
• Formula quiz with three difficulty levels

■ Handy tools
• Fuel economy and cost — km/L, L/100km and MPG (US/UK) side by side, plus cost per distance with a round trip switch. EVs too
• Discount, tip, and split the bill (share the result in a message)
• Unit price — compares two products per 100g, 100mL or item
• Stock averaging — new average price and gain/loss
• Ovulation — fertile window and next period (nothing is saved)
• Scan and sum — reads numbers from a photo and adds them up, on device
• Unit conversion, time zones (50+ cities, DST handled) and date calculator
• Open tools from Siri, Spotlight and the Shortcuts app

■ Quotes and invoices
• Rows sharing a tax rate are grouped into a subtotal (2 rows free)
• Rounding applies once per rate subtotal, so the total always agrees
• One-page PDF — quote, invoice or receipt with date, issuer, recipient and registration number (preview free, export with Pro)

■ Tools by country (Settings > Region)
Your country of residence is separate from your display language and decides which tools appear.
• VAT and GST — 9 countries (China, Germany, Spain, France, Italy, Netherlands, Belgium, Austria, Singapore), two-way net/gross
• Stock sale tax — Korea, Japan and China. Enter the sale and cost to see the tax and what you keep
• Japan — consumption tax, simplified taxation, invoice transition relief, the 20% special rule, resale profit, simple inventory, and six payroll tools including take-home pay, social insurance by prefecture and the furusato nozei limit
• China — social insurance and housing fund, take-home pay, and year-end bonus tax comparison
• Korea — net salary, the four major insurances, severance pay, VAT, compound interest and annual leave
• Each tool explains how it calculates and what it leaves out

※ Results are for reference. For actual filing and payment, please consult a tax professional or your national tax authority.

■ About Pro
• The calculator stays free — arithmetic, scientific functions, memory, history and themes
• Tools, country calculators, the formula book, the workbook and photo math open with one purchase (not a subscription). The workbook lets you try 3 problems per topic for free
• No ads, even in the free version
※ If you downloaded this app before Pro was introduced, your Apple ID keeps every feature free

■ Built to be easy to use
• Thousands separators as you type (100000 → 100,000)
• Dark and light mode, seven accent colors
• Works on iPhone, iPad and Mac, with hardware keyboard support
• 9 languages, following your system or switched manually in the app

■ Private by design
• Every calculation happens on your device — nothing is sent anywhere
• No network requests, no tracking, no ads, no permission dialogs
• Everything works offline

A simple look and solid functions, for the small calculations you do every day.