Tools for traders, makers and website owners.
GST invoices, HSN codes, fabric GSM, diamond sizes, marketplace profit and website checks. Built by a software team in Surat, free to use, nothing to install.
- 22 tools
- Free
- No signup
- Works on your phone
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Most used
Diamond mm to carat
Convert a diamond's size in millimetres to its approximate carat weight, and back, for round and fancy shapes. Carats to grams and cents too.
Open the toolGold & jewellery price
Work out a jewellery bill from weight, karat, today's gold rate, making charges, stone value and GST, with every line shown.
Fabric GSM calculator
Find a fabric's GSM from a weighed sample, or estimate it from ends and picks per inch and yarn counts.
GST invoice generator
Make a GST tax invoice with CGST/SGST or IGST worked out, amount in words, and download it as a PDF. In English or Gujarati.
HSN code & GST rate finder
Find the HSN code and GST rate for sarees, fabrics, yarn, garments, job work, diamonds and jewellery.
Meesho profit calculator
See what you actually keep on a Meesho order after shipping, GST, TCS, TDS, returns and your product cost.
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All 22 tools
Search by name, or jump to a category.
Diamond & jewellery
Sizes, sieves and jewellery prices
Diamond mm to carat
Convert a diamond's size in millimetres to its approximate carat weight, and back, for round and fancy shapes. Carats to grams and cents too.
Diamond sieve size chart
Look up sieve sizes against millimetres, approximate carat weight per stone and stones per carat, for melee and small diamonds.
Gold & jewellery price
Work out a jewellery bill from weight, karat, today's gold rate, making charges, stone value and GST, with every line shown.
Textile
GSM, yarn counts and fabric weights
Fabric GSM calculator
Find a fabric's GSM from a weighed sample, or estimate it from ends and picks per inch and yarn counts.
Yarn count converter
Convert yarn counts between denier, tex, decitex, English count (Ne) and metric count (Nm) in one step.
Fabric metre to kg
Convert fabric between metres and kilograms using its GSM and width, and see the weight per metre.
Billing & GST
Invoices, LR copies, HSN codes and e-way bills
GST invoice generator
Make a GST tax invoice with CGST/SGST or IGST worked out, amount in words, and download it as a PDF. In English or Gujarati.
LR / bilty generator
Fill in a lorry receipt (LR / bilty) for a consignment and print or save it as a PDF.
E-way bill validity
Find when an e-way bill expires from the distance and the time it was generated, for normal and over-dimensional cargo.
HSN code & GST rate finder
Find the HSN code and GST rate for sarees, fabrics, yarn, garments, job work, diamonds and jewellery.
Online selling
Marketplace profit, UPI and WhatsApp
Meesho profit calculator
See what you actually keep on a Meesho order after shipping, GST, TCS, TDS, returns and your product cost.
Flipkart profit calculator
Work out profit per order on Flipkart after commission, fixed and collection fees, shipping, GST on fees, TCS and TDS.
Amazon seller profit
Estimate Amazon.in profit per order after referral fee, closing fee, shipping, GST on fees, TCS and TDS.
UPI QR code generator
Make a UPI payment QR code for your UPI ID, with or without a fixed amount and note, and download it to print.
WhatsApp link generator
Create a wa.me click-to-chat link with a pre-filled message, plus a QR code for your counter, bills and catalogues.
Website & marketing
Checks, costs and policies for your site
Website speed audit
Paste a URL and get real Core Web Vitals for mobile and desktop, with a prioritised fix list, in about 30 seconds.
Google review QR card
Turn your Google review link into a printable "Review us on Google" card with a QR code for your counter or bills.
AI crawler & llms.txt checker
Check whether ChatGPT, Claude, Perplexity and Google's AI crawlers are allowed on your site, and whether you have an llms.txt file.
SPF, DKIM & DMARC checker
Check a domain's email records so your mails land in the inbox, not spam.
Website cost calculator
Pick the pages and features you need and get a realistic price range and timeline for your website.
App cost calculator
Choose platforms and features to estimate what a mobile or web app costs to build in India, and how long it takes.
Privacy policy generator
Answer a few questions to get a privacy policy for your website or Meta lead form, written for India's DPDP Act.
FAQ
Questions
Are these tools really free?
Yes. Every tool is free to use with no signup, and the calculators have no limit. The checks that run on our server have a fair-use limit per visitor so they stay fast for everyone: three speed audits a day, and ten AI crawler or email checks every ten minutes.
Do you store what I type?
Calculators and document makers such as the GST invoice and LR generators run in your browser, so what you type isn't sent to us. Some remember your own details in your browser for next time, and you can clear them. The AI crawler and email checks send only the domain you enter to our server and keep nothing. The speed audit keeps a record of the address tested, and your email if you add one, so we can follow up. If you use "Email me this", we keep your email to send it.
How accurate are the GST rates and fees?
GST rates come from the CBIC notifications, including the changes from 22 September 2025, and each tool shows the date it was last checked. Marketplace fees and gold rates change often, so those fields are editable. For a filing or a large bill, confirm the rate with your CA.
Can I use them on my phone?
Yes. Every tool is built for phones first, and documents like invoices, LR copies and QR cards can be printed or saved as a PDF from the phone.
Can you build a tool like this into my own software?
Yes. We build billing, ERP, inventory and CRM software for textile, diamond and jewellery businesses with these calculations inside, so your team doesn't copy numbers between tools. Tell us what you need on the contact page.
What if the tool I need isn't here?
Ask for it on the contact page. If it's something many businesses search for, we may add it to this list.
Business software
Need one of these inside your own software?
We build billing, ERP and inventory systems for textile, diamond and jewellery businesses, with these calculations built in.