PrefixCalc vs Calculator Pro

This calculator supports Metric‑prefix such as kilo and giga. The calculator supports quetta (10^30) and quecto (10^-30), which were added in 2022. Main Functions ・Support for arithmetic operations (+ - ×÷) ・Results converted to Japanese numerals for display ・Delete one character at a time with the "DEL" button 　Press and hold to delete all ・Press and hold to copy calculation formulas and results 　English (Short scale, Long scale) and 　Chinese numerals can also be selected. ・Calculations that include prefixes such as 2M+1k, 2M×1μ, etc. Note: ・Very large numbers that exceed 200 digits may be rounded off for display and calculation purposes. 　Please note this when precision is required. ・Short scale and Long scale are currently supported up to 10^198. ・Kanji notation is supported up to 10^72. 　If it is greater than the number, it will be displayed in Arabic numerals.

Calculator Pro is a scientific calculator, currency converter, unit converter, and everyday math toolkit. Split a bill, check homework, convert USD to EUR or JPY, switch meters to feet, or run a percentage without jumping apps. Multi-language UI, region-aware currencies, optional key haptics, Dark Mode that can follow the system. Calculation runs on your device. Use it as a discount calculator, a scientific calculator with trig functions, a travel currency converter, or a metric-to-imperial unit converter. STANDARD CALCULATOR & SCIENTIFIC CALCULATOR Everyday arithmetic: addition, subtraction, multiplication, division, chained operations, percentage calculator, discount calculator, increase/decrease, share-of-total. Good for checkout, splitting costs, homework. Scientific mode: sine, cosine, tangent, inverse trig, common log, natural log, exponents, powers, square root, square, factorial, degree/radian switching. Readable expressions and results. Reopen calculation history to continue. CURRENCY CONVERTER & EXCHANGE RATES Instant multi-currency conversion. Region-aware defaults can prioritize USD, EUR, GBP, JPY, KRW, CNY, HKD, TWD. Edit a list for travel money, overseas shopping, tuition estimates, or quote checks. Rates may be delayed and are for reference only. Confirm with your bank before sending money. UNIT CONVERTER Type once and compare metric, imperial, and everyday units: • Length: meter, centimeter, millimeter, kilometer, inch, foot, yard, mile • Mass: kilogram, gram, pound, ounce • Temperature: Celsius, Fahrenheit, Kelvin • Time, area (square meter, hectare, square foot, acre), volume (liter, milliliter, cubic meter, gallon) • Speed: km/h, mph, m/s, fuel consumption • Engineering: power, energy, heat, pressure, force, torque, density • Electricity: voltage, current, resistance, frequency • Digital storage: KB, MB, GB, TB (1024 or 1000), data rate • Optics, radiation, and other everyday categories Useful for shopping, home projects, running pace, lab work, and estimates. MORE EVERYDAY TOOLS In most regions: percentage calculator; binary / octal / decimal / hexadecimal converter; BMI calculator; random number generator. Date calculators, mortgage or savings estimators, and other local helpers may appear by region and language—not shown everywhere. HISTORY & HOME SCREEN WIDGET History saves expressions and results so you can review or continue. A Home Screen widget shows recent records. Plain-text export is available; CSV and PDF are in the optional purchase section below. WHO IT’S FOR Students (homework, scientific functions, unit conversion, hex converter), everyday work (percentages, exchange rates), travelers (currency converter, metric/imperial), and anyone who wants a calculator with history and a widget. Currency rates, planning estimates, and BMI are informational only—not investment, medical, tax, or legal advice. Confirm with official sources before you act. Data may be delayed or vary by region. LIFETIME PRO (OPTIONAL IN-APP PURCHASE) Core calculation, common unit conversion, and basic tools work without a purchase. Lifetime Pro is a one-time In-App Purchase—not a subscription, no auto-renew, no monthly billing. It typically unlocks CSV or PDF history export (plain-text export stays available), extra themes, extra professional unit categories, and more currencies beyond the free allowance. Payment, receipts, and refunds are handled by Apple through the App Store. Restore Purchase works on the same Apple ID. Family Sharing is enabled for eligible family members under Apple’s rules. Terms of Use: https://iorangepie.com/common/ios/calculatepro/terms-of-service-en.html Privacy Policy: https://iorangepie.com/common/ios/calculatepro/privacy-policy-en.html Apple Licensed Application End User License Agreement (includes In-App Purchases): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/