Free tools · no sign-up

Free calculators for Indian small businesses

The everyday sums of running a shop, clinic or small firm — GST, EMIs, udhaar, cheques and margins — worked out correctly and explained in plain words. No sign-up, nothing to install.

GST calculator

Add or remove GST at 5%, 18% or 40% and see the CGST, SGST or IGST split to the paisa.

Also: GST calculator online · inclusive GST calculator · reverse GST calculator

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EMI calculator

Monthly EMI, total interest and a full repayment schedule for home, car and business loans.

Also: loan EMI calculator · home loan EMI calculator · car loan EMI calculator

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Amount in words

Rupees in words for cheques and invoices (lakh, crore, Hindi), plus a GST invoice number checker.

Also: number to words in rupees · rupees in words · amount in words for cheque

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Profit margin calculator

Profit, margin and markup from cost and price — or the price to charge for the margin you want.

Also: margin calculator · markup calculator · selling price calculator

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About these tools

Why are these tools free?

We make Solaris Builder, an AI app builder for Indian small businesses. These calculators answer the questions our users ask most often, so we made them free for everyone. They work on any phone, keep what you type in your browser, and never ask for your number or email.

When a calculator isn't enough — you want it to remember every customer, print GST bills or work for your staff — describe the app you need in plain words and Solaris builds it for you.

  • Accurate to the paisa, with Indian digit grouping
  • Works on any phone — nothing to install
  • Private: what you type stays in your browser
  • Every formula explained in plain words

Need more than a calculator? Describe your app.

Start building — it's free

Or see apps for your business and ready templates.