TheQuickCalculator

A lightweight popup calculator with add, subtract, multiply, divide, and more.

Quick Calculator ----- Quick Calculator is free to use every day, right from your browser toolbar (popup, side panel, or full screen tab): Full scientific calculator — powers (^), square root, percent, fractions, π, factorials, nPr/nCr, abs, negatives, random numbers, and a 2nd key (or hold Shift) that unlocks inverse trig and more on every button Smart answers — solves equations for x, quadratics with both roots, 2×2 systems, Pythagorean problems, and even works with imaginary numbers (i) Equation memory — your last 3 calculations stay visible under the answer Complete History tab — your last 100 calculations, with copy-all and clear Timer & Stopwatch tab — hundredths-of-a-second stopwatch, countdown timer that keeps running even when the extension is closed Full Settings — design presets, custom colors, sound effects with 4 sound themes, and every preference saved automatically Highlight-to-calculate — select an equation on any webpage, right-click, and it's solved instantly Sound effects — key clicks, tab blips, and theme chimes (Default, Chords, Retro, or Bass) Interactive tutorial — a guided walk-through of everything in the free version ---------- 🔓 $1 Lifetime Upgrade — one payment, forever Unlock the entire extension with a single one-time purchase. No subscriptions, no recurring fees — pay once, own it on every device with your account: 📈 Graphing panel — plot up to 10 lines at once: straight lines, curves (y=x²), inequalities with shading, double bounds (2<x<5), and data points like (0,2)(0,4) 5 graph modes — lines, data tables, polar graphs, bar charts, and pie charts — with pan, zoom, hover readouts, connect-the-dots, a line of best fit with full stats (min, max, mean, median, standard deviation), save-as-image, and copy-to-clipboard 🤖 Ask Gemini about your math — a built-in AI tutor that only answers math questions. It explains equations step by step and can even draw what it's describing directly onto your graph Button-by-button Help — click any key and get a full explanation of what it does, plus a complete text guide 🔄 Unit & currency converter — length, weight, temperature, time, and live currency conversions 💵 Tip calculator — 10/15/20/25% presets, custom tips, and bill splitting 💸 Loan & interest calculator — payments, totals, and interest over time 📅 Date calculator — "march 13th 2026 + 30 days" style date math 🔢 Ratio solver — fill in any three parts of a:b = c:d and get the fourth 📝 Rich-text Notes — 10,000 characters with bold, italics, checklists, and section dividers Seasonal themes — Fall, Winter, Summer, Spring, Christmas, Valentine, and Retro presets, with festive banner suggestions when the season rolls around The full tutorial — an in-depth guided tour covering every graph mode, every tab, and every feature above Everything is stored locally and privately — your notes, history, and API keys never leave your browser (except the math questions you choose to send to Gemini).