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About This Calculator

This free online calculator combines a Basic Calculator and a Scientific Calculator in one tool — with a live calculation tape, adjustable rounding, memory storage, and a built-in rate converter. No app download, no sign-up, and nothing you calculate is ever stored on our servers.

What Is a Basic Calculator?

A basic calculator handles the four fundamental operations of arithmetic — addition, subtraction, multiplication, and division — along with percentages, decimals, and memory functions (M+, M-, MR, MS, MC). It's built for quick, everyday number crunching: totalling a shopping bill, splitting an expense between friends, working out a discount, or checking what percentage one number is of another.

What Is a Scientific Calculator?

A scientific calculator extends a basic calculator with the functions used in school, engineering, and technical work: square roots, exponents (x², x^y), logarithms (log, ln), trigonometric functions (sin, cos, tan and their inverses asin, acos, atan), factorials (x!), reciprocals (1/x), and the constant π. Switch to it anytime using the "scientific calculator" link above the keypad — no page reload, no separate tool needed.

What Makes This Calculator Unique

Most free online calculators only give you a basic keypad. This one is built to actually replace a physical desktop calculator, with a few things you won't find on most calculator websites:

Live calculation tape Every calculation is time-stamped and logged automatically, so you can scroll back and check your working — just like a receipt printer on a physical calculator.

Adjustable rounding (0–13 decimals) Choose exactly how many decimal places you want to see, from whole numbers to 13-digit precision — useful for both quick estimates and precise scientific work.

Built-in rate converter Set your own exchange rate once, then convert any result to € or $ instantly with a single tap — no need to open a separate currency converter.

Download your history Export your entire calculation tape as a plain .txt file with one click — handy for record-keeping, invoices, or homework proof.

Fullscreen & resizable Expand the calculator to fullscreen for distraction-free work, or drag the corner to resize it to exactly the size you want on desktop.

Zero data storage Nothing you type is sent to or stored on our servers. Your tape lives only in your own browser, and you control if it's saved, downloaded, or deleted.

How to Use This Calculator

Type your numbers using the on-screen keypad or your keyboard.
Tap an operator (+, −, ×, ÷) to build your expression.
Press = to see the result instantly.
Need scientific functions? Click scientific calculator to reveal sin, cos, log, √, and more.
Every calculation is logged in the tape panel with date and time.
Use save, download, delete, or print to manage your history.
Tap the fullscreen icon for a larger, distraction-free view — especially useful on mobile.

Worked Example 1 — Basic calculation with memory

Step 1: Type 4500, press MS → stores 4500 in memory

Step 2: Type 1250 + 375, press = → result 1625

Step 3: Press MR → recalls 4500

Step 4: Press + then MR again, press = → 9000

Worked Example 2 — Scientific calculation

Step 1: Switch to scientific calculator

Step 2: Type 30, press sin → 0.5 (sine of 30°)

Step 3: Type 144, press √ → 12

Step 4: Type 2, press x^y, type 10, press = → 1024

Formulas Used in This Calculator

Function	Formula / Logic
Percentage	(number ÷ 100)
Square root	√x
Square	x²
Power	x^y
Reciprocal	1 ÷ x
Factorial	x! = x × (x−1) × (x−2) ... × 1
Logarithm (base 10)	log₁₀(x)
Natural log	ln(x) = log_e(x)
Sine, Cosine, Tangent	Calculated in degrees
Inverse trig (asin, acos, atan)	Returns angle in degrees

Basic vs Scientific Calculator — Quick Comparison

Feature	Basic Calculator	Scientific Calculator
Add, subtract, multiply, divide	Yes	Yes
Percentage (%)	Yes	Yes
Memory (M+, M-, MR, MS, MC)	Yes	Yes
Square root, square, power	No	Yes
Trigonometry (sin, cos, tan)	No	Yes
Logarithms (log, ln)	No	Yes
Factorial, reciprocal, π	No	Yes
Best suited for	Bills, shopping, quick sums	Students, engineers, science & math

Keyboard Shortcuts

Key	Action
0–9	Enter digits
+ - * /	Basic operators
.	Decimal point
( )	Parentheses
Enter or =	Calculate result
Backspace	Delete last character
Esc	Clear everything

Tips to Get the Most Out of This Calculator

Use MS to store a subtotal before starting a new calculation — you can recall it anytime with MR without retyping it.

Lower the round setting to 2 for money calculations, or raise it to 10–13 for scientific precision work.

Download your tape as a .txt file at the end of the day if you're using this for bill totals or study sessions — it works as a simple record.

Common Mistakes to Avoid

Forgetting to clear memory (MC) before starting a new set of calculations — old memory values can carry over and throw off totals.

Assuming trigonometric functions use radians — this calculator works in degrees, so sin(90) = 1, not sin(π/2).

Not checking the round setting — a low rounding value can hide small decimal differences that matter in precise work.

Why Use This Calculator?

100% free — no hidden charges, no premium tier
No login or signup required — open it and start calculating instantly
Zero data storage — your calculations stay in your own browser; nothing is sent to or saved on our servers
Works on any device — phone, tablet, or desktop, fully responsive
No installation — runs directly in your browser, no app needed

Who Is This Calculator For?

Students solving homework, algebra, trigonometry, or exam prep
Shopkeepers and small businesses totalling bills, discounts, and change
Engineers and technicians needing quick scientific calculations on the go
Accountants and finance professionals running fast checks alongside spreadsheets
Anyone who just needs a reliable calculator without opening a separate app

What Can This Calculator Solve?

Everyday arithmetic and bill splitting
Percentage-based discounts and markups
Square roots and powers for math homework
Trigonometric problems in degrees
Logarithmic and exponential calculations
Quick currency-style conversions using a custom rate
Multi-step calculations with memory recall, so you never lose your place

Frequently Asked Questions

Is this calculator free to use?

Yes, completely free with no login required.

Does it store my calculation history?

No. Nothing is saved on our servers. Your tape history stays in your browser only, and you can download or delete it anytime.

Can I use this calculator on my phone?

Yes, it's fully mobile-optimized with large touch-friendly buttons and works smoothly on any screen size.

Does it support scientific functions like sin, cos, and log?

Yes — click "scientific calculator" above the keypad to reveal all scientific functions.

Are trigonometric functions in degrees or radians?

Degrees.

Can I download my calculation history?

Yes, use the "download" button in the tape panel to save your history as a .txt file.

Is there a fullscreen mode?

Yes, tap the fullscreen icon in the top-right corner of the calculator.

What is the round option used for?

It controls how many decimal places (0 to 13) are shown in your results — lower for everyday money math, higher for scientific precision.