Same formula · Different countries · Different answers
Free Online Calculator for every country's standards
Every result shows how standards differ between countries. BMI categories, tax brackets, tipping customs — we explain them all.
⚖️ BMI — WHO, Japan, China, Asia-Pacific at once
💵 Paycheck — US, UK, Canada, Australia take-home
📊 Inflation — Japan held value; US lost 45% since 1990
▶️ YouTube — US viewers earn 9× more than India
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Angle:
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❤️ Health
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WHO, Japan, China, Asia-Pacific standards
Body Fat Calculator
US Navy method — men & women
Sleep Calculator
Best bedtime based on 90-min sleep cycles
Calorie Calculator
Mifflin-St Jeor · NHS Schofield
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Korean age vs international age
Tip Calculator
Tipping customs in 10+ countries
Ovulation Calculator
Fertile window — NHS, ACOG, BZgA guidance
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Home & car loan — India, US, UK, Japan rates
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28 currencies — USD, EUR, GBP, INR, JPY, AED…
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Nifty 50, ELSS, mid-cap — monthly & lumpsum
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India 5–28%, UK 20%, Australia 10%, SG 9%
Paycheck Calculator
US, UK, Canada, Australia take-home pay
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15yr/30yr US · 25yr Canada · UK terms
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0% tax, housing + transport allowance breakdown
India Income Tax
Old vs New regime FY 2024-25 comparison
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US retirement benefit · SSA 2024 formula
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6 countries · 1970–2024 CPI data
Tax Calculator
US, UK, Canada income tax brackets
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Metric vs Imperial — UK/US differences
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28 currencies — USD, EUR, GBP, INR, JPY, AED
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MB, GB, TB — US vs binary storage explained
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HEX ↔ RGB ↔ HSL ↔ CMYK — web vs print
What makes this site different
Same number. Opposite meaning.
A BMI of 26 is "overweight" by WHO standards (used in the US, Europe, Australia). That same BMI 26 is classified as "Obese Grade I" in Japan. Your doctor's recommendation changes based on which standard they use. We show you all of them.
🌍 WHO
Overweight
BMI 26
🇯🇵 Japan
Obese Grade I
BMI 26
🌏 Asia-Pacific
Obese Class I
BMI 26
🇨🇳 China WGOC
Overweight
BMI 26
Calculators by Country
All countries →Featured Guide
How Countries Calculate Differently
Why does 1,000 mean something different in Germany? What is Japan's 万? How do date formats, grading systems, and VAT vs sales tax differ worldwide?
📚 From the Learning Hub
Explore all → 📐 💰 🇸🇬 🇫🇮 🌍 🔢
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Step-by-step methods, formulas & worked examples.
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How Countries Teach Math
Compare teaching philosophies across 10 countries.
How to Convert Fractions & Decimals
Convert between fractions, decimals & percentages.
Frequently Asked Questions
Why do BMI standards differ between countries? ▾
BMI thresholds differ because research shows Asian populations develop obesity-related health risks at lower BMI values. The WHO sets overweight at ≥25 and obesity at ≥30. Japan (JASSO) classifies BMI ≥25 as obese. The Asia-Pacific guideline sets overweight at ≥23. So a BMI of 26 is "overweight" by WHO but "obese grade 1" in Japan.
How is take-home pay different in the US vs UK? ▾
On a $60,000 salary: US workers pay federal income tax (~22% bracket) + 7.65% FICA = roughly $47,000 take-home. UK workers earning £60,000 pay 40% income tax on earnings above £50,270 + National Insurance ≈ roughly £42,000 take-home. UK workers receive NHS healthcare in return.
What does $100 in 1990 equal today? ▾
In the United States, $100 in 1990 is equivalent to approximately $247 in 2024 — a 147% cumulative inflation increase over 34 years. In Japan, ¥100 in 1990 is worth approximately ¥115 in 2024, reflecting Japan's near-zero inflation. In the UK, £100 in 1990 equals roughly £260 in 2024 using RPI.
How much does YouTube pay per 1,000 views? ▾
YouTube RPM (revenue per 1,000 views, after YouTube keeps 45%) averages: US ~$5.50, UK ~$4.20, Germany ~$4.00, Canada ~$3.80, Australia ~$3.60, Japan ~$2.40, Brazil ~$1.20, India ~$0.60. Finance and business content earns 2–3× these averages. 1 million views from India earns roughly what 100,000 views from the US earns.
How do you add fractions with different denominators? ▾
To add fractions with different denominators: (1) Find a common denominator. (2) Convert each fraction. (3) Add the numerators. Example: 1/2 + 1/3 = 3/6 + 2/6 = 5/6. The formula is: a/b + c/d = (ad + bc) / bd.