IndCalc
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Standard and scientific in one place. Copy any expression or result. Save only what you choose to keep.
The IndCalc Calculator is built around the moments that matter: copying a tricky expression, deciding which results are worth keeping, and switching between basic and scientific without breaking flow. Here's what we focused on.
Two modes share the same display, history, and keyboard. Switch to scientific only when you need sin, log, √, ^, π, or factorials.
Copy a single number — or the full expression that produced it. Perfect for receipts, invoices, and sharing work with a teammate.
Nothing is saved by default. Tap the bookmark on a result to keep it. Your session results stay in memory and disappear on refresh — your privacy, your choice.
Type digits, operators, parentheses, and Enter. Press Esc to clear, Backspace to delete, Ctrl/Cmd-C to copy the result. Built for fast typing on a real laptop.
Type 200+10% and get 220, not 200.10. Type 200×10% and get 20. The calculator reads context like an accountant would.
No accounts, no tracking on your numbers, no eval(). Calculations parse through a safe in-house expression engine — your inputs never leave the page.
Use the on-screen grid or your keyboard. The expression and the running result are both visible at all times.
When your expression is valid, the answer previews live before you press equals — no surprises.
One tap copies the answer or the whole expression. One tap saves a result to private local storage. Refresh and only the saved entries remain.
The IndCalc Calculator works as a Progressive Web App — install it once and it opens in its own window like a native app. No app store, no account, no tracking. Installation takes about ten seconds.
Once installed, the calculator works offline once cached, and your saved history stays on your device — exactly the same as in the browser.
A calculator should disappear into the background. You shouldn't have to think about which mode you're in, where the cursor went, or whether your last result was lost. The IndCalc Online Calculator was built around three quiet ideas: copy everything, remember nothing without permission, and let one keyboard do all the work.
Standard mode handles every routine calculation — totals, splits, taxes, distances. Scientific mode unlocks trigonometry, logarithms, exponentials, factorials, and the constants π and e, with a single toggle for degrees or radians. Both modes share the same display, the same history list, and the same keyboard shortcuts, so muscle memory transfers instantly.
Smart percent handling matches what an accountant or shopkeeper expects: 200 + 10% adds 10% of 200 (220), 200 × 10% multiplies by 0.10 (20), and 50% on its own returns 0.5. You can mix percents with parentheses and other operators freely; the calculator works out the right interpretation from context.
Privacy is built in. Nothing about your calculations is sent to a server. Your in-session results live in memory only and disappear on refresh. Saving a result writes one line to your browser's local storage on this device — nowhere else. There is no account, no analytics on your numbers, and no opaque eval() of arbitrary code: every expression is parsed by a small in-house engine designed to fail loudly on garbage input rather than crash silently.
Mobile is treated as a first-class citizen, not an afterthought. Buttons are tall enough for thumbs, the history opens as a bottom sheet that slides over the result, and the live preview means you can see the answer before you commit. On a desktop, the keyboard does everything: digits, operators, parentheses, factorial, percent, Enter, Backspace, Escape, and Ctrl/Cmd-C to copy the latest answer.
If you've been bouncing between a phone calculator, a spreadsheet, and a Google search bar to do basic arithmetic, this is the page that consolidates all three. Bookmark it, pin it to your home screen, or open it in a tab. It's free, it's fast, and it's built to outlast the next ten 'best calculator' apps.
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Honest answers to the questions people actually ask before they trust a calculator.
Yes. The IndCalc calculator is completely free to use, with no signup, no ads inside the calculator, and no usage limits.
Nothing is saved automatically. Each result you compute lives in a session list that disappears when you refresh the page. To keep a result permanently, tap the bookmark icon — only then is it written to your browser's local storage. You can clear saved entries any time, and they never leave your device.
Trigonometry (sin, cos, tan, plus their inverses), logarithms (log base 10 and natural log ln), square root, powers (x², x^y), factorials (x!), absolute value, the constants π and e, and switching between degrees and radians.
It is context-aware. Used after + or − it computes percent-of-the-left-operand: 200+10% = 220. Used after × or ÷ it divides by 100: 200×10% = 20. Standalone (10%) it equals 0.1.
Yes. Digits 0–9, operators +, -, *, /, ^, %, parentheses, decimal point, and ! are all wired up. Press Enter or = to evaluate, Backspace to delete, Esc to clear, and Ctrl/Cmd-C to copy the result.
Yes. The button grid scales to your screen, the history panel becomes a bottom drawer, and the layout stays one-tap accessible. It is tested on iOS Safari, Android Chrome, and on iPad and tablets.
Three things. You can copy the full expression as well as the result. You can save just the calculations that matter — instead of an autosaved tape of every tap. And standard plus scientific share one view, so adding a square root or a trig function never requires switching apps.
Or pin it to your phone's home screen — it works offline once cached.