TetraKits
Key layout
- Gray keys — digits 0–9 and decimal point
- Orange keys — +, −, ×, ÷ operators
- Blue keys — sin, cos, tan, log, ln, √, x², π, e
- Red keys — AC (all clear), ⌫ (delete), ± (sign)
- Blue = key — evaluate the expression
Scientific Calculator
Perform scientific calculations in your browser — trigonometry, logarithms, exponents, roots, factorials, and constants. Use the on-screen keypad or keyboard, with calculation history for multi-step problems.
Read: Scientific Calculator Guide: Real Device UI, DEG/RAD & Trig →
- Free to Use
- No Signup
- Privacy Friendly
TetraKits
SC-991
DEG
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How to use the scientific calculator
- 1
Tap the keypad
Use the device buttons like a physical calculator — numbers on gray keys, operators in orange, functions in blue.
- 2
Switch DEG or RAD
Press the DEG key to toggle radians. Trigonometry (sin, cos, tan) respects the active angle mode.
- 3
Press equals
Build an expression with parentheses, then press = or Enter. Use AC to clear or ⌫ to delete one character.
Calculator functions
The keypad mirrors a handheld scientific calculator. Trigonometry uses degrees when DEG is shown on the LCD, or radians when set to RAD.
Examples
- sin(30) = 0.5 in DEG mode
- log(100) = 2 (base 10)
- 5^2 or x² → 25
- √(16) = 4
- (2 + 3) × 4 = 20
Why Use This Tool?
-
Real Calculator UI
LCD display and keypad layout like a handheld scientific calculator.
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Free Forever
Unlimited calculations with no signup or ads.
-
DEG / RAD Mode
Toggle degrees or radians for trigonometry with one tap.
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Private
All math runs locally — nothing leaves your device.
Frequently Asked Questions
Does the calculator support keyboard input?
Yes. Type digits, operators, parentheses, and Enter for equals. Standard calculator keyboard shortcuts work.
What is the difference between DEG and RAD?
DEG computes trig functions in degrees (360° circle). RAD uses radians (2π circle). Ensure mode matches your problem.
Can I calculate logarithms and exponents?
Yes. log (base 10), ln (natural log), 10^x, e^x, and x^y are available on the keypad.
Is there calculation history?
Yes. Previous expressions and results appear in the history panel for reference.
Is this scientific calculator free?
Yes. Unlimited calculations with no signup; runs entirely in your browser.
Scientific Math Without Installing Software
Engineering homework, lab unit conversions, and quick trig checks should not require downloading a desktop app. A browser scientific calculator with DEG/RAD toggle, history, and keyboard input covers most advanced arithmetic.
