Universal Calculators
Privacy-first calculators in your browser — no signup, no install.
All inputs are processed only in your browser — never sent to a server.
⭐ Live now
💰 Finance
Investment, savings, and loan planning.
🩺 Health
BMI, basal metabolic rate, body composition.
⚖️
BMI Calculator
Body mass index with WHO classification + healthy weight range
🔥
Calorie / TDEE
BMR + activity multiplier (Mifflin–St Jeor) + protein and water
📏
Body Fat (Navy)
Tape measurement formula + CUN-BAE comparison + ACE classification
⚖️
Ideal Weight
BMI 22 + Devine / Robinson / Miller / Hamwi medical formulas
🗓️ Lifestyle
Dates, time, and everyday utilities.
No results — try a different keyword.
Accuracy & limits
Categories
Universal financeCompound interest, savings, loan amortization — works in any country / currency, just plug in your rate.
HealthBMI, BMR / TDEE (Mifflin-St Jeor), Body-Fat % (US Navy), Ideal Weight — international formulas widely cited in clinical literature.
Korean tax · pay (KR-specific)Salary, year-end, severance, comprehensive income tax, unemployment, hourly minimum wage. 2026 official rates. See Korean site for the full set.
Real estate · vehicle (KR-specific)Capital gains tax, acquisition tax, vehicle annual tax, brokerage fee. Linked to Korean law / government rates.
Pregnancy · parenting (KR-leaning)Due date (international), pregnancy week, baby clothing sizes, infant formula concentration.
Daily · digitalKorean age, D-Day, storage size (GB ↔ TB), monitor PPI / viewing distance.
Why are these "estimates"?
All calculators are official-rate-based estimates. Real tax / pay / medical numbers vary with:
- Non-taxable items — meal allowance, transit, child-care (employer policy)
- Personal exemptions — dependents, children, disability, elderly care
- Special deductions — medical, credit card, donation, pension (year-end adjustment)
- Special programs — youth SME tax break (90%), foreigner flat rate (19%)
- Company deductions — union dues, welfare fund, group insurance
File via NTS Hometax or consult a licensed tax accountant.
Pregnancy / parenting / health limits
BMI / BMR / body-fat / heart-rate zones are general guidelines — individual variation is large. Due date = LMP + 280 days but real delivery is ±14 days. Always consult a physician, OB/GYN, or certified trainer for medical decisions.
Sources (15+ official agencies)
- NTS Hometax — income tax, year-end, capital gains, VAT
- NHIS — health insurance, long-term care
- NPS — national pension
- Employment Insurance — unemployment benefits
- Ministry of Employment & Labor — minimum wage, weekly rest pay, parental leave
- Ministry of Health & Welfare — parental allowance, formula, weaning
- law.go.kr — all tax / labor laws
- Ministry of Land — brokerage fees, jeonse / monthly conversion rate
Update policy
Last verified: 2026-05-09
- Korean rates are verified annually in November (gazette season) and January (new fiscal year).
- Major changes (national pension hike, minimum wage update) are reflected immediately.
- All numbers sourced from the issuing agency directly — no blog or news quotes.
FAQ
Is my data uploaded anywhere?
No. All calculations happen inside your browser using JavaScript and WebAssembly. Your inputs never leave your device. This is a static site with no server-side processing.
Can I use these results for tax filing or medical decisions?
No. All calculations are estimates for reference only. Use official tools or consult licensed professionals (tax accountants, doctors, financial advisors) for accurate, decision-grade results.
What calculators are available in English?
Eight universal calculators: compound interest, BMI, calorie/TDEE, body fat (Navy method), ideal weight, savings, loan, and D-Day. Korean-specific tools (Korean tax, real estate law, labor law) are not translated as they are jurisdiction-bound — see the Korean version of the site for those.
Does it work on mobile?
Yes. Chrome on Android, Samsung Internet, and Safari on iOS are all supported, and you can install it as an app via "Add to Home Screen" (PWA). All calculations work offline once installed.