Blog
By Siavash Ghanbari ยท Founder of Emojar
๐Degrees vs Radians (and Gradians): When to Use Each
Why does sin(90) give 0.894 in code? Learn when to use degrees, radians, gradians and arcminutes, how to convert between them and the mistakes to avoid.
Tool GuideUnitsMathProgrammingโFraction Math for Woodworking: Planning a Shelf Cut List
Tape measures speak in eighths and sixteenths. Walk through a real shelf cut list, adding, multiplying and dividing mixed numbers without a slip.
Tool GuideCalculatorsMathDIYโHow Simplifying Square Roots Works, With Worked Examples
Why does โ48 become 4โ3? Learn what perfect squares, irrational roots and simplified radicals really are, with worked examples you can check.
Tool GuideCalculatorsMathExplainerโHow to Type Math Symbols in Documents, LaTeX and HTML
One symbol, three forms. How to choose between pasting โ, writing \sum in LaTeX or using an HTML entity, and how to avoid look-alikes such as ฮฃ versus โ.
Tool GuideReferenceMathLaTeX๐Mean vs Median vs Mode: Which Average Should You Use?
The mean, median and mode can tell very different stories about the same numbers. Learn when to use each, plus range and standard deviation, with examples.
Tool GuideCalculatorsMathStatisticsโ๏ธRecipes, Rent and Maps: 6 Everyday Uses for Ratios
Ratios quietly run cooking, cleaning, shared bills and map reading. Six worked examples show which ratio calculation fits each job and the traps to avoid.
Tool GuideCalculatorsMathEveryday๐จRGB to HSL Formula, Explained Step by Step
How RGB values become hue, saturation and lightness, with two fully worked examples you can check by hand and code-friendly formulas for each step.
Tool GuideColorMathExplainer๐ฒSix Probability Myths and the Math That Breaks Them
Does a 1-in-100 chance happen within 100 tries? Do two 50% chances make a sure thing? Six common beliefs about odds, checked with real numbers.
Tool GuideCalculatorsMathProbabilityxโฟWhy Your Exponent Answer Looks Wrong, and How to Fix It
Got 1.9999986 instead of 2, an error for a negative base, or "Too large to display"? Here is what each exponent result means and how to get the answer you want.
Tool GuideCalculatorsMathTroubleshooting๐5 Percentage Increase Myths That Trip Up Smart People
Why doesn't a 50% rise followed by a 50% drop get you back to where you started? Five common percentage-change myths, debunked with simple numbers.
Tool GuideCalculatorsMathFinanceโ๏ธPercentage Change vs Percentage Difference: Which One to Use
Percentage change and percentage difference give different answers for the same two numbers. Learn when to use each, with worked examples, zero and negatives.
Tool GuideCalculatorsMathExplainer๐งฎWhy Calculators Disagree: Order of Operations Explained
Is 2^3^2 equal to 64 or 512? Why is -2^2 negative? Learn the precedence rules a scientific calculator follows and how to type expressions it reads correctly.
Tool GuideCalculatorsMathExplainer๏ผ How to Calculate Percentages: 7 Everyday Examples
Three percentage formulas cover almost every real question, from test scores to rent hikes. Here's which one to use, with worked numbers for each case.
Tool GuideCalculatorsMathHow-to