Free calculators for small businesses
They run in your browser. Nothing you type is sent anywhere.
GST calculator (India)
Invoice maker
Fill in the details, then press Print or save as PDF.
| Item | Qty | Price |
|---|
Profit margin and markup
Loan EMI calculator
Need this inside your own Excel file?
I build calculators, invoice systems and reports that run in your workbook with one click.
About these tools
Each calculator runs entirely in your browser, so nothing you type leaves your computer. They use the same formulas I build into client workbooks for GST invoices, pricing, margins and loan schedules. Need the same logic inside your own Excel or Google Sheets file, with your rates, your logo and reports that fill themselves? That is the kind of work I do every day.
Who does the work
Sourab Saha · Data Analyst · Kolkata, India
I’m Sourab Saha, a data analyst and automation developer from Kolkata, India, with more than ten years of experience turning manual data work into clean, automated systems. On Fiverr and Upwork I have delivered over 500 data and automation projects for clients in the US, UK, Europe, Australia and the Middle East, with a 5.0 rating on both platforms. My toolkit is Excel VBA, SQL, Power BI and DAX, Python with Selenium, and Google Apps Script. I collect data from files, databases and websites, clean it, model it and present it so decisions take minutes instead of days. I build and test every tool on your real data, deliver it with a short walkthrough, and keep revising until it works exactly the way you need. Alongside my freelance work, since 2024 I have also worked as a Data Analyst for AH Group of Industries, a US healthcare group, building automated reports and Power BI dashboards from billing, payroll, audit and attendance data.
Rated 5.0 on Fiverr and Upwork, with more than 500 automation projects delivered and over ten years of Excel VBA. You get a fixed price before any work starts, your files stay private on your order page, and every order comes with a proper invoice.
Services: Excel VBA automationWeb scraping and browser automationGoogle Sheets and Apps ScriptPower BI and Excel dashboardsPython tools and scriptsFinance and accounting tools