GST and TDS calculators, invoice utilities, pricing and rate tools, and the compliance checks that come up when you bill clients in India. Free, no sign-up.
GST
GST Calculator — Add GST to any amount and see the CGST/SGST or IGST split. Free GST calculator for Indian freelancers and businesses at 5%, 12%, 18% and 28%.
Reverse GST Calculator — Extract the GST from a GST-inclusive amount. Free reverse GST calculator to find the base value and tax from a total at 5%, 12%, 18% or 28%.
Invoice Total Calculator — Build an invoice total: subtotal, optional discount, GST, and the TDS your client will withhold — so you know exactly what will land in your account.
TDS
TDS Calculator — Calculate the TDS your client withholds under Section 194J, 194C, 194H or 194I. Free TDS calculator for Indian freelancers and professionals.
Pricing
Freelance Hourly Rate Calculator — Work out the hourly rate you need to hit a target annual income, accounting for the fact that billable hours are far fewer than working hours.
Day Rate Calculator — Convert a target annual income into a freelance day rate, based on the number of billable days you realistically work in a year.
Retainer Fee Calculator — Price a monthly retainer from an hourly rate and the hours it covers, and see the effective hourly rate a retainer implies.
Margin & Markup Calculator — Find your profit margin and markup from a cost and price, or the price you need for a target margin. Stop confusing the two.
Price-from-Margin Calculator — Enter your cost and the margin or markup you want, and get the price to charge. The reverse of a margin calculator.
Discount Calculator — Apply a percentage discount to a price and see the amount off and the final figure.
Getting paid
MSMED Late-Payment Interest Calculator — Calculate the compound interest a registered micro/small supplier can claim on an overdue invoice under Section 16 of the MSMED Act — three times the RBI bank rate.
Simple Interest Calculator — Calculate simple interest on an amount over a number of days at an annual rate.
Days Overdue Calculator — Count how many days an invoice is overdue from its due date to today — the number you need before chasing or claiming interest.
Invoicing
Amount in Words Converter — Convert a rupee amount into words in Indian format (lakh, crore) for invoices and cheques — "One Lakh Twenty Thousand Rupees Only".
Invoice Number Generator — Generate a clean, GST-compliant invoice number in a financial-year format like INV/2026-27/001 — sequential, unique, and reset per year.
Invoice Due Date Calculator — Work out an invoice due date from the issue date and your payment terms — Net 15, 30, 45 or a custom number of days.
General
Percentage Calculator — Find X% of a number, and the percentage change between two numbers. Two quick everyday calculations.
Percentage Change Calculator — Calculate the percentage increase or decrease between two numbers — useful for tracking month-on-month income or rate rises.
Compliance
GSTIN Format Checker — Check whether a GSTIN is structurally valid: 15 characters, state code, embedded PAN, entity code and checksum digit. Format check, not a live lookup.
PAN Format Checker — Check whether a PAN is structurally valid — five letters, four digits, a letter, with the correct entity-type character.
IFSC Format Checker — Check whether a bank IFSC code is structurally valid — four bank letters, a zero, and six branch characters.