Calculator
What the GST Calculator does
GST Calculator: calculates Base Amount, GST Amount and Total from Amount, GST Rate and Calculation. Formula: Tax = base x rate / 100 (adding) | base = total / (1 + rate/100) (removing). Example: amount 1000 ₹, GST rate 5% and calculation Add GST gives base amount ₹1,000.00.
This calculator reads Amount, GST Rate and Calculation and produces Base Amount, GST Amount and Total. Set your values, then run the tool to see the result.
Typical users are anyone weighing up a loan. Small differences in rate or term compound into large differences in what you actually pay.
The work is done by JavaScript already loaded in your browser, so your input never crosses the network.
Each field is explained further down, along with the method and a worked example that uses the default values.
What do the GST Calculator fields mean?
The GST Calculator uses 3 inputs. Sensible defaults are loaded up front, which means you can change one number at a time instead of filling the whole form first.
| Field | What to enter | Default |
|---|---|---|
| Amount | measured in ₹ | 1000 |
| GST Rate | choose from 5%, 12%, 18% or 28% | 5% |
| Calculation | choose from Add GST or Remove GST | Add GST |
How does the GST Calculator work?
Removing tax is not the same as subtracting the rate from the total, which is the most common mistake with this calculation.
Bad input produces an error, never a confident-looking wrong answer.
Worked example
These are the values the GST Calculator loads by default, and the result it produces from them. These are the exact values loaded when the page opens, and the answer they produce.
| Amount | 1000 ₹ |
|---|---|
| GST Rate | 5% |
| Calculation | Add GST |
| Base Amount | ₹1,000.00 |
|---|---|
| GST Amount | ₹50.00 |
| Total | ₹1,050.00 |
Read next: Four Percentage Calculations People Get Wrong
How to use it
- Set Amount in ₹.
- Pick a value for GST Rate: the options are 5%, 12%, 18% or 28%.
- Pick a value for Calculation: the options are Add GST or Remove GST.
- Press Calculate.
- Check Base Amount, GST Amount and Total on the right.
- Print gives a tidy version without the navigation, which is handy for attaching to a file.
What this tool does not do
- Fees, taxes and eligibility rules vary by product and are not included unless there is a field for them.
- Lender rounding rules differ, so the final figure on your statement may differ by a small amount.
- It handles the common case well and the unusual case literally.
- The result inherits any error in the inputs without flagging it.
Frequently asked questions
Enter Amount in ₹. Every input names its unit, and every output does too, which removes the usual source of error.
With the values loaded when the page opens, base amount comes out as ₹1,000.00. Overwrite any of the starting values and the result follows.
No. Nothing about your finances is transmitted or logged. The arithmetic happens on your own device.
No payment and no login. Advertising covers the running costs.
It is precise to the method and honest about its scope: no calculator can know your eligibility, and eligibility is what usually moves the final number.