Guide

This Guide will help you get the most out of coolca.lc, the fast free online calculator, and its special features like Memory Presets, Money Calculations, and Solvers: built-in formulas at your fingertips to help you find fast answers like tip calculation, profit margins and markups, and conversions.

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Using the calculator

Memory Presetscoolca.lc's five Memory presets keep numbers you use often, like a tax rate, a price or a running total, one tap away. Here's how to save, recall, replace and clear them.
Money CalculationsHow coolca.lc handles money: the $ key, results rounded to the cent, why dividing dollars by dollars gives a plain number, whole-dollar amounts, and switching to your own currency and number format.
PercentagesOn coolca.lc, 200 + 10% is 220, the way people mean it. Here's how the % key works after each operator, how to add tax, take off a discount, and find what percent one number is of another.
Add Up a List of NumbersCopy a list of amounts from a receipt, a bank statement, an email or a spreadsheet and paste it into coolca.lc. It adds them up, skipping dates and labels, and shows every number before you press equals.
Type Thousands and Millions FastHold the 0 key on coolca.lc to multiply the number you're typing by 1,000, and hold it again for millions. Type 2.5, hold 0 twice, and you have 2,500,000, with no zeros to count.
The Log, Undo and Repeatcoolca.lc keeps a Log of your last 100 calculations, lets you undo and redo every step, and repeats the last operation when you press equals again. Here's how to reuse results and get back to where you were.
Keyboard ShortcutsEvery key on coolca.lc has a keyboard shortcut, from the basics to Memory presets, Solvers, the thousands key and undo. Here's the complete list, and the handful worth learning first.