About DdakSem

Every calculation you need in daily life — all in one place, exactly right.

What is DdakSem?

DdakSem is a free everyday calculator service built for salaried workers, freelancers, real estate investors, and anyone who cares about their health. The name means "exactly right calculation" — we make it easy and accurate for anyone to calculate complex taxes, insurance premiums, loan interest, health metrics, and more.

All calculators reflect the latest 2026 tax rates, contribution rates, and regulations, including the National Pension reform (contribution rate 9.5%) and the health insurance premium increase (7.19%) — updated as soon as changes take effect.

Our Services

Finance Calculators: Calculate take-home salary, severance pay, loan interest, and social insurance contributions. Check your net pay before your payslip arrives and plan your loan repayments.

Tax Calculators: Calculate capital gains tax and gift tax. Estimate your tax liability before a property sale or family gift transfer, and plan accordingly.

Real Estate Calculators: Calculate acquisition tax and rent conversion rates. Compare the cost of buying a home and decide whether a deposit-based lease or monthly rent works better for you.

Health Calculators: Calculate BMI (Body Mass Index) and BMR (Basal Metabolic Rate). Get an objective picture of your health and set realistic diet and fitness goals.

Investment Calculators: Calculate stock average purchase price, U.S. stock capital gains tax, and compound returns. Track your investment performance accurately and prepare for tax filing.

Date Calculators: Calculate D-Days, legal age, and time differences. Quickly find how many days until an exam, your age under the unified age system, working hours, and more.

DdakSem Blog

Beyond calculator guides, the DdakSem Blog covers practical information on finance, tax, real estate, health, and investment. We regularly publish actionable content you can apply right away — from year-end tax refund tips and retirement pension comparisons to health insurance premium updates.

Our Principles

  • Accuracy: All calculations are based on officially published government tax rates and contribution rates. Any legislative changes are reflected immediately.
  • Privacy: All calculations run entirely in your browser. Personal data you enter — salary, assets, etc. — is never sent to or stored on our servers.
  • Free for Everyone: All calculators and blog content are available completely free of charge.
  • Accessibility: The service is optimized for all devices — desktop, tablet, and smartphone.

The DdakSem Team

DdakSem is run by a team passionate about finance, tax, and web development. With the goal of "making complex calculations simple for everyone," we build calculators that are genuinely useful in everyday life, one at a time.

If you have questions or suggestions, please reach out through our contact page. We welcome all feedback — calculator requests, bug reports, collaboration proposals, and anything else on your mind.