Calculator
What the Sales Tax Calculator does
Sales Tax 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.
The Sales Tax Calculator turns Amount, GST Rate and Calculation into Base Amount, GST Amount and Total. Press the button when your inputs are ready and the result appears below.
Typical users are anyone weighing up a loan. Small differences in rate or term compound into large differences in what you actually pay.
The page holds your values in memory and forgets them the moment you close it.
Everything needed to verify a result is further down: the fields, the method and one fully worked example.
What do the Sales Tax Calculator fields mean?
The Sales Tax Calculator uses 3 inputs. Nothing is blank on load, so you can see the shape of the answer before supplying your own figures.
| 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 Sales Tax 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 a message, not a silently incorrect figure.
Worked example
These are the values the Sales Tax 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 |
How to use it
- Key in 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.
- Read Base Amount, GST Amount and Total in the results panel.
- Print gives a tidy version without the navigation, which is handy for attaching to a file.
What this tool does not do
- Rates are treated as fixed for the whole term; a floating rate will change the outcome.
- Fees, processing charges and taxes are not included unless there is a field for them.
- Batch work is not supported; each run handles one set of values.
- A number that passes validation has been checked for plausibility, not for correctness.
Frequently asked questions
Enter Amount in ₹. Each field states its unit next to the input, and outputs are labelled the same way.
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. The work runs in JavaScript inside this page, so your values never leave your device. You can confirm it in your browser network tab.
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.