Compound Interest Calculator Bangkok

Compound Interest Calculator for Bangkok

Savings accounts and deposits in Bangkok are priced off the Bank of Thailand policy rate, which stood at 1% at the end of September 2026. National consumer price inflation was 2.82% in September 2026, so a saver earning exactly the policy rate would have a real return of -1.77% a year before tax.

Facts that change the answer

• Bank of Thailand policy rate: 1% (September 2026, BIS series)
• Annual CPI inflation: 2.82% (September 2026)
• Real return at the policy rate: -1.77% per year (computed as (1 + 1%) / (1 + 2.82%) minus 1)
• Policy rate at each December: 2016 1.5%, 2017 1.5%, 2018 1.75%, 2019 1.25%, 2020 0.5%, 2021 0.5%, 2022 1.25%, 2023 2.5%, 2024 2.25%, 2025 1.25%
• Policy rate moves since January 2020 (month-end data): February 2020 1.25% to 1%; March 2020 1% to 0.75%; May 2020 0.75% to 0.5%; August 2022 0.5% to 0.75%; September 2022 0.75% to 1%; November 2022 1% to 1.25%; January 2023 1.25% to 1.5%; March 2023 1.5% to 1.75%; May 2023 1.75% to 2%; August 2023 2% to 2.25%; September 2023 2.25% to 2.5%; October 2024 2.5% to 2.25%; February 2025 2.25% to 2%; April 2025 2% to 1.75%; August 2025 1.75% to 1.5%; December 2025 1.5% to 1.25%; February 2026 1.25% to 1%
• In 8 of the last 10 years the December policy rate was above that year's average inflation

Worked example for Bangkok

Start with THB 200,000, add THB 2,000 a month and use 1% compounded monthly. After 10 years you would have THB 473,325 from THB 440,000 of deposits; after 20 years THB 775,383 from THB 680,000. These amounts in Thai baht are only examples; real deposit rates offered by banks in Bangkok are usually below or above the policy rate depending on the term and the bank.

To see what that balance is worth in today's money, take inflation into account: at 2.82% a year, THB 473,325 in ten years has the buying power of about THB 358,521 now. Recent history for Bangkok's currency: 2020: 0.5% rate vs -0.8% inflation, 2021: 0.5% rate vs 1.2% inflation, 2022: 1.25% rate vs 6.1% inflation, 2023: 2.5% rate vs 1.2% inflation, 2024: 2.25% rate vs 0.4% inflation, 2025: 1.25% rate vs -0.1% inflation.

If you hold the money in a fixed deposit, the rate you lock in matters more than the compounding frequency. On THB 200,000 over 10 years at 1%, switching from yearly to monthly compounding adds only THB 101, while a rate 1 point higher adds THB 23,215.

Sources: BIS central bank policy rates · BIS consumer price statistics. Checked 5 November 2026. For how the maths works, see the Compound Interest Calculator guide.