Free financial calculators for Thailand

ThaiCalPro is a small, focused collection of online calculators for people who live or work in Thailand. Whether you are budgeting for a new home, deciding between two car loan offers, estimating your tax bill before filing, or just trying to understand a credit card statement, the goal is the same: give you a clear primary number first, then show the full breakdown so you can see exactly how it was calculated.

Every calculator is open about the formula it uses. We follow the standard reducing-balance interest formula for loans, the progressive personal income tax brackets published by the Thai Revenue Department, and the SME / non-SME corporate income tax structure for businesses. Where a rule has caps or eligibility tests that depend on your specific situation, the tool tells you to confirm with the official source rather than silently guessing.

Nothing you type here is sent to a server. The calculations happen in your browser, results are not stored, and we do not need an account or a phone number to use any of the tools.

If you are looking at a personal loan, refinancing offer, or any general installment loan, start with the Loan Calculator. It uses a flat principal, annual interest rate, and term in months or years to estimate the monthly payment and amortisation schedule.

For property purchases, the Mortgage Calculator lets you start from property price and down payment, which is closer to how Thai banks present home loan offers. The Car Loan Calculator is similar but tuned for hire-purchase style auto loans.

If you need to plan for tax season, the Personal Income Tax (Thailand) tool covers progressive brackets and common allowances, while the Salary After Tax tool is a quick monthly take-home estimate. Business owners can use the Corporate Income Tax tool to compare SME and non-SME outcomes.

For day-to-day money questions, VAT and Credit Card Minimum Payment cover the small but frequent calculations that come up around invoices and credit card statements.