Calculators for financial reports
Free calculators that run in your browser, with no sign-up or install. Each one is built from the formulas in our Excel workbooks, and its results are checked against Excel before every release.
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Thai Income Tax Calculator 2026 (B.E. 2569) and Deduction Planner
Enter your salary, bonus, freelance income and deductions to see the year's Thai personal income tax, the amount to pay or reclaim, and how much RMF and Thai ESG you can still buy before year end. Rates and caps from the Revenue Department's guides. Runs in your browser.
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Sales are up. Why is cash down?
Adjust sales, DSO, DIO and DPO and see the next 12 months of cash at once. Free, no sign-up, and every result matches the Excel model.
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Which tool to use
Setting a selling price, or checking what each item leaves after fees and shipping: use the pricing calculator. Add your monthly fixed costs to see how many units cover them.
When the plan calls for sales growth and you need to know whether cash holds up month by month. The working capital simulator lets you change sales, receivable days (DSO), inventory days (DIO) and payable days (DPO), and shows cash for each of the twelve months.
The three measures and their formulas are explained in the cash conversion cycle article. Reading cash from the actuals of a closed month is covered in the Cash, Balance Sheet & Inventory guide.
Each tool runs in your browser with formulas written from our Excel files. Before every release, a test compares its results with the values Excel calculates itself. If any number differs, the site does not build, and the fix goes into the tool, not into the Excel values.
The calculation runs in your browser. Nothing you enter is sent to a server.
Every report's Excel workbook is free to download, in Thai and English.