Calculators and document tools for Thailand
Use English tools for Thai tax, business, finance, work, electricity, invoices, and quotations. Calculations share the same tested functions and verified rate records as the Thai pages.
English calculators and generators
Tax and utility pages state their Thailand-specific scope and link to official sources.
Thailand VAT Calculator
Add Thailand VAT to a price before tax.
Open toolThailand Reverse VAT Calculator
Remove VAT from a VAT-inclusive amount.
Open toolThailand Withholding Tax Calculator
Calculate a user-selected Thai withholding tax rate.
Open toolThailand VAT and Withholding Tax Calculator
Calculate invoice total, withholding, and transfer amount.
Open toolThailand Net Payment Gross-up Calculator
Find the base needed for a target net payment.
Open toolProfit Calculator
Calculate profit and profit margin from revenue and cost.
Open toolMargin and Selling Price Calculator
Find a selling price for a target margin.
Open toolMarkup Calculator
Calculate selling price from cost and markup.
Open toolBreak-even Calculator
Estimate units and revenue needed to cover fixed costs.
Open toolReducing-balance Loan Payment Calculator
Estimate a monthly amortising loan payment.
Open toolFlat-rate Car Loan Calculator
Estimate Thai-style flat-rate car finance.
Open toolSimple Interest Calculator
Calculate interest without compounding.
Open toolCompound Interest Calculator
Estimate future value with periodic compounding.
Open toolMonthly Savings Goal Calculator
Estimate the monthly contribution for a target.
Open toolOvertime Pay Calculator
Calculate overtime from an hourly rate and multiplier.
Open toolThailand Electricity Bill Calculator
Open this English tool for Thailand.
Open toolInvoice Generator
Open this English tool for Thailand.
Open toolQuotation Generator
Open this English tool for Thailand.
Open toolShared calculations, clear scope
The English and Thai pages call the same calculation engines, validation rules, and utility-rate records. English pages do not maintain separate rates or formulas.