Free Online Calculators — Standard, Scientific, Financial and Graphing
Free, private online calculators for everyday arithmetic, scientific functions, time-value-of-money and graphing — all running instantly in your browser with full keyboard support.
Calculator
Free easy online calculator: add, subtract, multiply, divide, percent and sign toggle, with keyboard input and big thousand-separated display, instant and local.
Scientific
Trig, logs, exponents, factorial and parentheses, BIN/OCT/DEC/HEX conversion and basic stats, with DEG/RAD and keyboard input, instant and local.
Graphing Calculator
Plot functions in 2D and 3D, overlay derivatives, solve equations and linear systems, run matrix LU/eigen operations and script your own computations — all local.
Four calculators, one place
Standard, scientific, financial and graphing — each on its own focused page.
Local-first, no upload
All computation runs in your browser; expressions and matrices never leave your device.
Keyboard & touch friendly
Full keyboard shortcuts on desktop and large touch targets on mobile, in six languages.
FinCompute brings together four calculators for study, work and daily math: a standard four-function calculator for quick arithmetic, a scientific calculator for trigonometry/logarithms and base conversion, a financial calculator for time-value-of-money and depreciation, and a graphing calculator for 2D/3D function plots, derivatives, equations and matrices. Every tool runs locally in your browser — no sign-up, no tracking — with full keyboard support and six languages.
Standard calculator: quick, keyboard-driven arithmetic
The standard calculator handles addition, subtraction, multiplication, division, percentage and sign toggle with a large monospaced display and thousand separators. It supports full keyboard input — digits, operators, Enter, Backspace and Escape — making it as fast as a physical desktop calculator for everyday sums, tips and unit-price comparisons.
Scientific calculator: trigonometry, logs, bases and statistics
The scientific calculator adds sin/cos/tan and inverses, logarithms and exponentials, factorials, powers and roots, DEG/RAD mode, BIN/OCT/DEC/HEX base conversion and basic statistics (mean, sum). It is suitable for high school and early-university math, engineering quick checks and programming tasks that need base arithmetic.
Financial calculator: TVM, NPV/IRR and depreciation
The financial calculator solves the five time-value-of-money variables (N, I/Y, PV, PMT, FV), computes net present value and internal rate of return for a cash-flow series, and generates straight-line, sum-of-years-digits and double-declining-balance depreciation tables — useful for loans, investments, leases and asset accounting.
Graphing calculator: 2D/3D plots, derivatives, equations and matrices
The graphing calculator plots multiple 2D functions with pan/zoom and numerical derivatives/tangents, renders interactive 3D surfaces, parametric curves and point clouds in WebGL, finds roots of single equations and solutions of linear systems, performs matrix algebra (determinant, inverse, RREF, LU, eigenvalues), and includes a safe built-in scripting language with loops and custom functions.
FAQ
QAre the calculators free to use?
Yes, completely free with no sign-up, no ads and no usage limits. Every calculator works immediately in the browser.
QDo the calculators work offline?
Yes. Once the page is loaded there is no backend dependency, and all calculations run locally in JavaScript.
QCan I use keyboard shortcuts?
The standard and scientific calculators support full keyboard input: digits, operators, Enter (=), Backspace (delete) and Escape (clear). The graphing script editor supports Ctrl/Cmd+Enter to run.
QWhich calculator should I use for loans and investments?
Use the financial calculator for TVM (loans, savings, annuities), NPV/IRR for cash flows and depreciation tables. For mortgages and Chinese income tax, see the dedicated financial tools in the Financial section.
QDoes the graphing calculator require a download?
No. 3D rendering uses WebGL built into modern browsers and loads on demand; there is no plug-in or app to install.