Calculator Pro by Tron

Calculator Pro brings a fast, elegant calculator right into your Firefox sidebar - no new tab, no separate app, just one click away whenever you need it.

Switch between Simple mode for everyday arithmetic and Advanced mode for full scientific calculations - built for students, engineers, and anyone who works with numbers.

Features:
• Simple & Advanced (scientific) modes
• Trigonometric functions (sin, cos, tan and inverses), logarithms, roots, powers, and factorials
• Combinatorics & number theory: nCr, nPr, GCD, LCM
• Degree/Radian toggle, constants (π, e), and a random number generator
• Memory functions (MC, MR, M+, M−)
• Calculation history — tap any past result to reuse it
• One-tap copy of any result
• Smart live preview as you type, with clear input/result separation
• Light, Dark, and Auto (system) themes with a clean, Apple-inspired design
• Full support for English, German, and Arabic (with right-to-left layout)
• Optional key-press sounds and button animations

Privacy first: Calculator Pro collects no data whatsoever. Everything - your settings, history, and memory - stays stored locally on your device. Nothing is ever sent anywhere.

Built for Firefox 142 and up.

Developed by Mo 🧮