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Japan Calculators

Calculators for Japan using Japanese standards — JASSO BMI thresholds, 0.5% mortgage rates, consumption tax, and yen conversions. In English.

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BMI Calculator (日本語)
JASSO standards — BMI ≥25 = obese in Japan vs WHO ≥30
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Japan Consumption Tax
10% standard rate, 8% reduced (food & non-alcohol drinks, newspapers)
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Japan Mortgage (EMI)
0.5% home loan rate — world's lowest. ¥35M at 0.5% vs India's 8.5%
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JPY Currency Converter
Convert yen to USD, EUR, GBP, INR and 24 more currencies
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Temperature Converter
Celsius ↔ Fahrenheit ↔ Kelvin
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BMI — Asia-Pacific vs WHO
Full comparison of WHO, Japan JASSO, Asia-Pacific, and China WGOC

Japan uses different standards than the rest of the world

The same number means something different in Japan. Here's what to know.

Home loan rate
BOJ near-zero rate policy
Japan
~0.5% p.a.
Global avg
4–9% avg
BMI "overweight" threshold
Higher health risk at lower BMI in Asian populations
Japan
23+ (Asia-Pacific)
Global avg
25+ (WHO)
BMI "obese" threshold
BMI 26 = obese in Japan, overweight in Europe/US
Japan
25+ (JASSO)
Global avg
30+ (WHO)
Consumption tax
Introduced 1989 at 3%, raised to 10% in 2019
Japan
10% (8% reduced)
Global avg
5–25% global avg
Tipping
No tipping culture; excellent service is standard
Japan
Rude / not done
Global avg
10–20% expected
GPA system
University uses S/A/B/C/D — S is highest
Japan
4.0 (university) / 5.0 (high school)
Global avg
4.0 US / 2.0–5.0 DE

Why Japan's calculators are different

Japan is an outlier in several measurement systems, which matters if you're moving to Japan, working there, or comparing Japanese health metrics:

BMI — Japan classifies overweight at BMI 23, obese at BMI 25

The WHO classifies overweight at BMI ≥25 and obese at BMI ≥30. Japan's obesity medical association (JASSO) classifies overweight at BMI ≥23 (same as Asia-Pacific guideline) and obese starting at BMI ≥25 — where the WHO says "normal weight" continues to 29.9.

A BMI of 27 in Japan is classified as "Obese Grade 1". In the US, UK, or Germany, the same BMI is "Overweight." This affects health insurance premiums and company health check requirements in Japan.

Mortgage rates — world's lowest

Japan's Bank of Japan (BOJ) maintained near-zero interest rates for 25+ years. Home loan rates of 0.5% mean the same ¥35 million mortgage costs ¥ 96,290/month in Japan vs ₹43,391/month equivalent in India at 8.5%. Japanese borrowers pay roughly 5× less in monthly installments for the same loan amount.