Free Ultimate Calculator Online
All-in-one calculator: Scientific, Programmer, Unit Converter, Financial & Date/Time modes. Keyboard support, history & more.
Privacy: All processing is done client-side; nothing you type or generate is sent to any server.
Monetization: We show light, non-intrusive ads to keep these tools free for everyone.
How It Works
- Select calculator mode (Scientific, Programmer, Converter, Financial, Date)
- Enter values using buttons or keyboard
- Get instant results with full expression history
- Copy results or use memory functions
When to Use This Tool
- βComplex math with trigonometry and logarithms
- βConverting hex/binary/octal for programming
- βUnit conversions (length, weight, temperature, data)
- βCalculating loan payments and compound interest
- βFinding date differences and ages
Use Cases & Examples
- β’Students solving math homework
- β’Programmers converting number bases
- β’Engineers doing unit conversions
- β’Home buyers calculating mortgage payments
- β’Project managers tracking business days
Frequently Asked Questions
Does it support keyboard input?
Yes! In Scientific mode, use 0-9, +, -, *, /, Enter (=), Escape (clear), and Backspace.
What scientific functions are included?
sin, cos, tan (with inverse), log, ln, sqrt, cbrt, exponents, Ο, e, and memory functions (MC, MR, M+, M-, MS).
What unit conversions are supported?
Length, weight, temperature, volume, area, speed, data storage, and time with 50+ units total.
Is calculation history saved?
Yes, the last 50 calculations are saved in your session. Click any history item to reuse the result.
What financial calculators are included?
Loan/mortgage calculator, compound interest calculator, and tip calculator with bill splitting.