CalcPro: All-in-One Calculator & Converter

Standard, scientific, date, and percentage calculators with 16+ converters, live currency rates, and custom converters.

CalcPro is a powerful all-in-one calculator and converter suite for your browser. Always one click or keyboard shortcut away without leaving your current tab. ◆ CALCULATOR MODES • Standard - Everyday arithmetic with a clean, responsive keypad • Scientific - Trigonometry, logarithms, exponents, factorials, and constants • Date Calculator - Find the difference between two dates or add/subtract days • Percentage Calculator - Quickly solve "X% of Y", "X is what % of Y", and percentage change ◆ CONVERTER Convert between 16 built-in categories: • Currency - Live exchange rates updated automatically • Distance, Weight, Temperature, Speed, Area, Volume • Time, Frequency, Pressure, Energy, Power, Fuel Economy • Data Storage, Angle, and more ◆ CUSTOM CONVERTERS Create your own conversion categories using simple equations like "24 apples = 15 oranges". Define unlimited custom units for any use case: cooking, crafting, gaming, or work. ◆ SMART FEATURES • Calculation history - Searchable, filterable, with one-tap reuse • Memory functions - M+, M-, MR, MC for storing intermediate results • Right-click to calculate - Select any number or expression on a page, right-click, and send it straight to CalcPro • Keyboard shortcut - Press Alt+C (or Cmd+Shift+C on Mac) to toggle CalcPro instantly • Persistent state - Your settings, history, and custom converters are saved across browser sessions ◆ DESIGNED FOR PRODUCTIVITY CalcPro opens alongside any webpage without covering your content. No popups, no new tabs. Just a fast, focused calculator always within reach.