Tetra 科学计算器

Chrome 科学计算器：弹出窗口、侧边栏和浮动计算器。支持三角函数、历史记录、变量和单位换算。可离线使用。

You're in the middle of homework, a lab report, or a spreadsheet, and you need a scientific calculator. So you reach for your phone, dig out an old Casio, or open yet another calculator tab. Every switch breaks your focus, and your numbers never follow you. Tetra Scientific Calculator fixes that: a full scientific calculator for Chrome that opens right where you're working, as a toolbar popup, a side panel calculator beside your page, or a floating calculator that stays on top of whatever you're reading (Ctrl+Shift+Y). Type the problem, get the answer, keep going. Every result lands in a searchable history, so multi-step calculations just flow: no retyping, no lost work, no tab-juggling. 🧮 A REAL SCIENTIFIC CALCULATOR, THREE WAYS • Popup - one click on the toolbar for quick math • Side panel calculator - a full workspace with history, variables, formulas, and unit converter that stays open while you scroll • Floating calculator - keep it on top of any document, PDF, quiz, or dashboard while you work ⌨️ EVERY FUNCTION YOU EXPECT FROM AN fx-991 • Trigonometry in DEG, RAD, and GRAD: sin, cos, tan, csc, sec, cot, and inverses • Logarithms and exponentials: log, ln, 10^x, e^x • Powers, roots, factorial, percent, parentheses, absolute value, π and e • Normal, Fixed, Scientific, and Engineering output modes with calculator-style ×10^N display • Type with your physical keyboard — enter expressions the way you'd write them 🕘 NEVER LOSE A RESULT AGAIN • Searchable calculation history with favorites, copy, reuse, and JSON/CSV export • Ans, PreAns, and variables A through Z — chain multi-step calculations like on a real calculator 📐 UNIT CONVERTER BUILT IN Length, Area, Volume, Time, Pressure, Weight/Mass, Temperature, and Fuel consumption — convert without leaving the calculator, then insert the result straight into your calculation. 📚 FORMULA HUB Forgot the quadratic formula or the volume of a cone? Search formulas for Algebra, Geometry, Trigonometry, Calculus, Probability, Statistics, Physics, and Chemistry, and insert them directly into the calculator. 👥 WHO USES IT • Students and teachers - homework, labs, and exam prep. Ideal on Chromebooks, where a real scientific calculator is one click away instead of an app install. • Engineers and scientists - quick sanity checks without leaving the spec, paper, or dashboard. • Finance and analysts - percentages, powers, and an exportable calculation trail. ⚡ FAST, FREE, YOURS Every feature and every theme (Light, Dark, OLED Black) is 100% free - no ads, no account, no upsell. It runs entirely offline on your device, so it opens instantly, works without internet, and your data stays yours. Built by the team behind tetracalculator.com, home of free online calculators for math, science, and everyday life. Add it to Chrome now and the next time you need a scientific calculator, it's one keystroke away.