The CalcNow Blog
Math, calculators, and the surprising details hiding in everyday arithmetic.
Articles
Why is Pi Day on March 14th?
Every year on March 14th, mathematicians, teachers, and number enthusiasts celebrate Pi Day. Here's why that date was chosen — and what makes π so special.
How Percentages Actually Work
Percentages seem simple until they don't. Here's how to think about them clearly — including the mistakes most people make with percentage increases and decreases.
Online Calculator vs Physical Calculator: Which Should You Use?
Physical calculators have been around for decades, but online calculators are increasingly taking over. Here's an honest comparison of both — and when each makes sense.
A Brief History of the Calculator
From Blaise Pascal's mechanical gears in 1642 to the pocket calculator revolution of the 1970s to the browser-based tools of today — how calculation went from rooms to chips to tabs.
Why CalcNow Loads So Fast
CalcNow opens near-instantly, even on slow connections. Here's exactly why — and what most other sites are doing that makes them so much slower.
Why 0.1 + 0.2 ≠ 0.3
Type 0.1 + 0.2 into JavaScript and you get 0.30000000000000004. This isn't a bug — it's a fundamental consequence of how computers store decimal numbers.
What Happens When You Divide by Zero?
Division by zero is one of the most famous forbidden operations in mathematics. But why is it undefined — and what does a calculator actually do when you try it?
Popular Calculations
Curious about a specific division? These are some of the most interesting ones.
Or explore any calculation at /blog/[number]-divided-by-[number]