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Internet Calculator

Big Red Calculator

Standard Math / Memory / History

Big Red Calculator main view

Big Red Calculator examples page

Big Red Calculator history page

Big Red Calculator shortcuts page

Big Red Calculator settings page

Big Red Calculator constants page

Our Big Red Calculator is the same 15-feature easy-to-use basic calculator that's on our home page.  The difference is this has no ads, no frame, and makes no network calls, even for images.  So it's fast, does not spy on you, and does just what you request.  Can be used locally on a secure device.

It remembers its calculations when closed, so when opened again, the calculator is just where the user left off, even if that was in the middle of a calculation.  Nice :-)

Calculator is delivered as a single HTML file (~60KB), and can be used on any device that has a browser, such as touchscreen devices, desktop PCs, laptops, iPads, smartphones, etc.

This proven calculator is perfect for use in meetings, classes, presentations, at home, and is designed for frequent all-day use.

Key Features


Four-function standard math calculator with left to right calculations


12-Digit, plus math expression, and memory value


16-Digit math accuracy, optional rounding correction, scientific notation E-307 to E+307


Addition, Subtraction, Multiplication, and Division


Squared, Square Root, Reciprocal, Inverse, and Percent

Memory Functions

Add, Subtract, Recall, and Clear

Result Format

Fixed or floating point, comma or period decimal point

Digit Grouping

1,000,000, 1'000'000, 1.000.000, or none

Keyboard Input

Yes, with button feedback


Clear All, Clear Entry, and Backspace


Equal repeats last operation


Yes, with reusable math calculations


Auto resizes to height and width boundary of window

Savable Settings


Error Conditions

Clear error messages


~50KB size

Light-Switch Simple

Big Red Calculator feature callouts

Designed for frequent all-day use.

Multi-User License Discounts

Multi-User License discounts are 50% off for each additional user.  The first calculator is at full price, and when you increase the quantity in the cart for a multi-user license, each additional calculator is half off.

If you purchase the calculator for five people (yourself and four others), then the cost would be . . .

$7 + $7 × 0.50 × 4    =     $7 + $14    =     $28

Multi-User License discounts are automatically applied when you increase the quantity purchased in the shopping cart.

What You Get

Via Purchase Confirmation Email

  • Big Red Calculator
    Minimized all-in-one HTML file (~50KB) containing the Big Red Calculator that you can place on all your devices, knowing it has no ads, and does not spy on you.
  • License
    Single-user multiple-device license.  Multi-user license when purchase quantity greater than one.
  • A Smile
    Knowing 3% of your purchase goes to Western Lands Preservation.

Big Red Calculator

Thumbnail image of Big Red Calculator

Add to Cart

180030    $7