Blog
By Siavash Ghanbari · Founder of Emojar
👕5 Myths About International Clothing Sizes, Debunked
A US 8 isn't a UK 8, an EU 38 isn't an Italian 38, and a Medium means little abroad. Five common sizing myths and what the charts really show.
Tool GuideUnitsClothingSizing🎈Bar, psi, kPa and hPa: Pressure Conversions in Real Life
Tire pressure in bar or psi, weather in hPa or inHg, dive tanks and blood pressure in mmHg. Real scenarios for converting pressure, and the gauge trap.
Tool GuideUnitsCarsConversion👟Buying Shoes From Another Country? A Sizing Walkthrough
Ordering EU or UK shoes with a US size, or the other way round? Follow one real purchase from measuring your foot to picking the size, with the numbers.
Tool GuideUnitsShoesSizing⚡Calories, Kilojoules, kWh and BTU: 6 Real Uses for Energy Units
Food labels, electricity bills, air conditioners and batteries all measure energy in different units. Six practical conversions with worked numbers.
Tool GuideUnitsScienceConversion📐Degrees 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 GuideUnitsMathProgramming📶Hertz to RPM, MHz and GHz: Frequency Explained Simply
What does 60 Hz, 7,200 rpm or 2.4 GHz actually mean? A plain-English guide to frequency units, with conversions for audio, radio, Wi-Fi, displays and motors.
Tool GuideUnitsTechExplainer⚡hp, PS, Electrical hp and BTU/h: Power Ratings Explained
Why a 150 PS car is "only" 148 hp, what an electric motor's hp means, and how many kilowatts a 12,000 BTU/h air conditioner really delivers.
Tool GuideUnitsCarsHome🏎️km/h, mph, Knots and Mach: Which Speed Unit Is Used Where
Road signs use km/h or mph, sailors and pilots use knots, scientists use m/s. Learn where each speed unit is used and how to convert between them quickly.
Tool GuideUnitsTravelConversion🗺️Square Feet to Square Meters Without the Common Mistakes
Why multiplying square feet by 0.3048 gives the wrong answer, plus how to convert room sizes, acres and hectares correctly, with worked examples.
Tool GuideUnitsHomeConversion⛽The MPG Illusion: Why 10 to 12 MPG Beats 40 to 50 MPG
Miles per gallon hides where the real fuel savings are. A worked comparison of three car upgrades, plus how to convert mpg, L/100 km and UK gallons correctly.
Tool GuideUnitsCarsMoney🔧Torque Specs in Nm, lb-ft or kgf·m? A Torque Wrench Walkthrough
Your manual says 110 N·m and your wrench reads lb·ft. How to convert wheel nut, bike and engine torque specs safely, and the 12x and 100x mistakes to avoid.
Tool GuideUnitsCarsDIY🧪US vs UK Gallons, Cups and Ounces: Which One Do You Have?
A UK gallon is 20% bigger than a US gallon, and a US cup isn't a metric cup. How to tell which volume unit you're dealing with and convert it right.
Tool GuideUnitsCookingConversion⏳Why a Month Is 30.44 Days in Time Conversions
Seconds, hours and weeks convert exactly, but months and years don't. Here's how average month and year lengths work, and when to use a date tool instead.
Tool GuideUnitsTimeExplainer💾Why Does My 1 TB Drive Show 931 GB? GB vs GiB Explained
Your new drive isn't missing space. The gap comes from decimal GB vs binary GiB, and bits vs bytes explains slow downloads. Here's how to convert both.
Tool GuideUnitsTechStorage🥄Why Your Cups-to-Grams Conversion Went Wrong (and How to Fix It)
Dense cookies, runny batter, salty bread? Most recipe conversion mistakes come from five causes. Here is how to spot each one and convert correctly.
Tool GuideUnitsCookingBaking⚖️Kilograms, Pounds, Stone and Tons: A Practical Guide
Luggage limits, body weight in stone, recipes in ounces, short vs long tons and carats. Real-life weight conversions worked out with exact factors.
Tool GuideUnitsConversionTravel🏛️Roman Numeral Mistakes to Check Before a Tattoo or Engraving
Why 99 isn't IC, 1990 isn't MXM, and 49 isn't IL. The rules behind valid Roman numerals and how to format dates for tattoos, rings and invitations.
Tool GuideUnitsNumbersDates🔡How to Write a Check Amount in Words (Checklist)
A checklist for writing dollar amounts in words on checks and contracts: where "and" goes, how to write cents, hyphens, and the mistakes banks reject.
Tool GuideUnitsFinanceWriting🌡️Celsius to Fahrenheit Myths That Lead to Wrong Answers
The 'double it and add 30' shortcut, converting temperature changes and degrees Kelvin: common temperature myths, corrected with exact formulas and examples.
Tool GuideUnitsConversionScience📏8 Everyday Length Conversions: Miles, Feet and Inches
Race distances, height in feet and inches, TV screens, nautical miles: practical metric-imperial length conversions with exact factors and worked examples.
Tool GuideUnitsConversionHow-to