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Savings Interest Calculator

Calculate returns on fixed deposits, savings accounts, and investments with a full year-by-year breakdown.

Last updated: May 2025

πŸ“’ ΰΈžΰΈ·ΰΉ‰ΰΈ™ΰΈ—ΰΈ΅ΰΉˆΰΉ‚ΰΈ†ΰΈ©ΰΈ“ΰΈ²

πŸ“‹ Savings Details

The amount you want to save or invest
Savings: ~0.5–1.5% / Fixed Deposit: 1–3% / Funds: 4–8%
Most bank deposits use compound interest
Regular monthly top-up (0 = none)
πŸ’°

Enter your details and click Calculate
to see your results.

Simple vs Compound Interest Explained

Simple Interest: Calculated only on the original principal. You earn the same amount each period.
Formula: A = P Γ— (1 + r Γ— t)

Compound Interest: Interest is added to the principal, so the next period's interest is calculated on a larger base β€” your money grows exponentially.
Monthly compound formula: A = P Γ— (1 + r/12)^(12t)

Thai Bank Deposit Rates (2025)

  • Regular Savings: ~0.5–1.0% per year
  • High-yield / Condition Savings: ~1.0–2.0% per year
  • Fixed Deposit 3–12 months: ~1.0–2.5% per year
  • Fixed Deposit 24–36 months: ~1.5–3.0% per year

Tips to Maximize Your Savings

  • Start Early: 100,000 THB at 4% compound for 20 years grows to ~219,112 THB
  • Save Consistently: Adding 3,000 THB/month for 20 years at 4% compound yields over 1.1 million THB
  • Tax on Interest: Thai bank deposit interest is taxed at 15% withholding at source

Frequently Asked Questions (FAQ)

What is the difference between a savings account and a fixed deposit in Thailand?
A savings account allows withdrawals at any time but offers lower interest (~0.5–1%). A fixed deposit locks your money for a set period (1–36 months) with higher interest (~1–3%), but early withdrawal typically forfeits interest earned.
Why is compound interest better than simple interest?
With compound interest, the interest you earn is added to your principal, so the next period's interest is calculated on a larger base. For example, 100,000 THB at 3% compounded for 10 years grows to ~134,392 THB, compared to only 130,000 THB with simple interest.
Is interest on Thai bank deposits taxed?
Yes. Thai banks automatically withhold 15% tax on all deposit interest at the time it is credited. You do not need to declare it separately on your annual tax return unless you choose to include it for a possible refund.
Should I keep money in a bank or invest in a mutual fund?
It depends on your goals and risk tolerance. Bank deposits are protected by the Deposit Protection Agency (DPA) up to 1 million THB and are ideal for emergency funds. Mutual funds offer higher long-term returns (4–8%) but carry market risk. A good strategy is to maintain 3–6 months of expenses in savings and invest the rest.
What is the Rule of 72?
The Rule of 72 is a quick way to estimate how long it takes for your money to double. Simply divide 72 by the annual interest rate. For example, at 4% per year, your money doubles in 72 Γ· 4 = 18 years. At 6%, it doubles in about 12 years.

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