Simple to use, with every function you actually need — from quick everyday math to real formulas and unit conversion.
■ Calculator
• Arithmetic, percentage, sign toggle
• Scientific functions (sin, cos, tan, log, ln, √, powers)
• Constants (π, e) and parentheses
• Memory keys (M+, M-, MR, MC)
■ History and favorites
• Saves up to 100 calculations automatically
• Star the ones you want to keep
• Delete one by one or clear them all
• Export as text
■ Handy tools
• Fuel economy — mileage from distance and fuel added. Shows km/L, L/100km and MPG (US/UK) together, so foreign figures read in your own units. EVs too (km/kWh, kWh/100km, mi/kWh)
• Fuel cost — total cost, fuel needed and cost per distance. A round trip switch covers your commute in one step. EV charging works the same way
• Discount — savings and final price, by percentage or fixed amount
• Tip — total and per person from amount, rate and party size
• Split the bill — excludes separately paid amounts, then divides by headcount
• Unit price — compares two products per 100g, 100mL or per item
• Stock averaging — new average price and total cost after buying more, plus gain/loss at the current price
• Ovulation — ovulation date, fertile window and next period from your last period and cycle (nothing is saved)
• Scan and sum — reads numbers from a photo and adds them up, on your device
• Unit conversion (length, weight, temperature, time, speed, volume, area, data)
• Time zones — move the hour in one city and compare the world at a glance (50+ cities, DST handled, offline)
• Date calculator — days between dates, add or subtract days, age
■ Formula book (interactive)
• 71 formulas across geometry, finance, trigonometry and algebra, physics, and astronomy
• Enter values and it calculates on the spot — a tool that answers, not a chart
• Geometry shapes label your values on the matching side or radius in real time
• Every formula has a how-to sheet and a note on where it came from (all 9 languages)
■ Tax tools by country (Settings > Region)
Your country of residence is separate from your display language, and decides which tools appear.
• VAT calculator — 8 countries. Two-way net/gross with standard and custom rates (China 13/9/6/3%, Germany 19/7%, Spain 21/10/4%, France 20/10/5.5/2.1%, Italy 22/10/5/4%, Netherlands 21/9%, Belgium 21/12/6%, Austria 20/13/10%)
• Japan — consumption tax (10%/8%/custom, three rounding modes), simplified taxation, invoice transition relief, the 20% special rule, and resale profit
• Korea — net salary, the four major insurances, severance pay, VAT, compound interest, savings interest and annual leave
• A disclaimer on first open, plus a help sheet in every tool
※ 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 tax calculators, the formula book and photo math open with a single purchase (one time, not a subscription)
• No ads. Not 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) and in every result
• Dark and light mode, seven accent colors
• Portrait and landscape
• Works on iPhone, iPad and Mac
• Haptic feedback and key sounds, paste from the clipboard
• 9 languages: English, Japanese, Korean, Chinese (Simplified and Traditional), German, Spanish, French and Portuguese (Brazil)
• Follows your system language, or switch 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
• Every feature works fully offline
A simple look and solid functions, to make the small everyday calculations feel better.
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