Free Invoice & Tax Tools
Simple, accurate and fast online calculators to manage invoices, taxes and salary compliance.
Free GST Calculator
Calculate GST instantly for inclusive and exclusive amounts as per Indian tax rules.
Use GST Calculator →Free VAT Calculator
Quickly calculate VAT for business invoices with precise tax breakdowns.
Use VAT Calculator →Free Gratuity Calculator
Calculate employee gratuity accurately based on Indian labour laws.
Use Gratuity Calculator →Free Estimate Generator
Create professional estimates for clients in seconds with our free tool.
Create Estimate →Why use Thinkogic Invoice Tools?
Thinkogic provides free, easy-to-use invoice and tax calculators designed for Indian businesses, professionals and startups. Our tools help you calculate GST, VAT and gratuity accurately without complicated formulas or paid software.
All tools are web-based, mobile-friendly and require no login. Whether you are generating invoices, calculating employee benefits or estimating taxes, Thinkogic helps you save time and avoid errors.