History

Math Constants

Archimedes' Constant Pi
3.1415926535Alt-P

Natural Logarithmic Base
2.7182818284Alt-E

Golden Ratio
1.6180339887Alt-G

Euler's Constant
0.5772156649Alt-Y

Examples

Calculate	Button/Key Sequence
2 x 3	2×3=
(2 x 3) + 10	2×3+10=
2 x (3 + 10)	3+10×2=
√ 2	2
1/1024	10241/x
2 x √ 2	2×2=
-2³	2±×==
√ 3² + 4²	3x²+4x²=
π x 10²	10×=×Alt-P=
256 + 10%	256+10%=
5% of 25	5%×25=
5³ √ 2 + 6	2+6=1/x ×5===

Keyboard Shortcuts

Button	Key

0...9	0 ... 9	Digits

AC	Esc	All Clear
CE	Delete	Clear Entry
		Backspace
=	=orEnter	Equals
.	.	Decimal Point

+	+	Add
−	-	Subtract
×	*orX	Multiply
÷	/	Divide

M+	A	Memory Add
MC	C	Memory Clear
MR	R	Memory Recall
M-	S	Memory Subtract

±	I	Invert +/-

	F1	Square Root
%	F2	Percent
1/x	F3	Reciprocal 1/x
x²	F4	Squared x²

	Alt-P	π - Pi
	Alt-E	e - Natural Log
	Alt-G	ϕ - Golden Ratio
	Alt-Y	γ - Euler's Constant

Reset

Settings

Display

Floating Point

Digit Grouping

Decimal Symbol

0.0

Negative Number

0.0

Rounding

Round calculated Fixed Point results
when they are displayed.

Fix Math Errors

Turns 1.3499999999... into 1.35
From accuracy limit of 64-bit values.

Show Math

Displays math expression while it is
entered: E.g. 20 + 5 × 5 − 15

Save Work

Loads history, memory, and settings
when calculator is restarted.

To Calculator

Bookmark this link for above settings . . .

Features

12-Digit display, 16-Digit math accuracy
Simple left to right math calculations
Fixed or floating point operation
4 Math operands (Add, Subtract, Multiply, Divide)
5 Math functions (Square Root, Squared, Reciprocal, Inverse, Percent)
4 Memory functions (Add, Subtract, Recall, Clear)
Clear all, clear entry, and backspace
Digit grouping 000's along with
international ',' and '.' use settings
Keyboard input with button feedback
Reusable math calculation history
(last 100 calculations)
Savable settings, history, memory, and display
Easy to repeat last operation
Displays math expression
Copy and paste values
Clear error messages
Resizable

About

Calculator - Version:

Created by Internet-Calculator.com

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Perfect for use in meetings, classrooms,
and at home.

Big Red Calculator

The Big Red Calculator is the same powerful free online calculator as our Basic Calculator — same 12-digit display, same calculation history, same memory functions, same 16-digit math precision — just dressed in red.

The memory and equal buttons are bold red, giving the calculator a distinctive look that's easy to spot at a glance. Some users open the calculator in a separate window and jump to it throughout the day for quick calculations. Some browsers let you keep a page open in a sliding drawer — Big Red sits there perfectly, always ready, easy to find.

Same great features, different look

12-Digit Display
With 16-digit math precision
Calculation History
Last 100 calculations, reusable with one click
Memory Functions
Store, recall, add, and subtract from memory
Resizable
Fills any window size on desktop or laptop
Saves Your Work
Between sessions
Keyboard Input
With key highlight feedback
International
Digit formatting options
Nothing to Install
Runs in any modern browser

Like all our calculators, Big Red is free to use online, supported by ads, and requires nothing to download or install. Just open it and start calculating.