All-in-One Calculator

Standard, scientific, currency and unit conversion — all in one popup.

• One calculator for everything, opened in a single popup with Alt+C. • BASIC & SCIENTIFIC • Standard arithmetic with full keyboard support • Trigonometry, logarithms, powers, roots, factorial, modulo • DEG / RAD / GRA angle modes and memory keys (M+, M-, MR, MC) • LIVE CURRENCY CONVERSION • 31 major currencies with automatically updated exchange rates • Offline fallback using cached rates • Customizable default pair and one-tap shortcuts • UNIT CONVERSION • 11 categories: length, weight, temperature, area, volume, speed, data, time, pressure, power, energy • Instant bidirectional conversion • Save your favorite conversions as shortcuts, add or remove freely • HISTORY & MORE • History for calculations and conversions, copy results with one click • Light and dark themes, auto follow system • No account, no ads, no tracking. All data stays in your browser.