Calculator
What the Invoice Calculator does
Invoice Calculator: calculates Base Amount, GST Amount and Total from Amount, GST Rate and Calculation. Example: amount 1000 ₹, GST rate 5% and calculation Add GST gives base amount ₹1,000.00.
The Invoice Calculator takes Amount, GST Rate and Calculation and returns Base Amount, GST Amount and Total. Enter what you need and trigger it when you are ready.
Seeing the total cost, not just the monthly figure, is what usually changes decisions. That is usually what brings someone checking a lender quote here.
This runs client-side, which means we never receive what you enter and could not retrieve it if asked.
Further down the page: what each field expects, how the result is derived, and one example worked from the defaults.
What do the Invoice Calculator fields mean?
The Invoice Calculator uses 3 inputs. Every field is populated on load; treat those numbers as a template rather than a suggestion.
| 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 Invoice Calculator work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same calculation.
Checks happen up front, so errors surface next to the form instead of hiding in the output.
Worked example
These are the values the Invoice Calculator loads by default, and the result it produces from them. This walkthrough uses the starting values, which means you can follow along without typing anything.
| 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
- Put 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.
- The results panel then shows Base Amount, GST Amount and Total.
- Share the link rather than a screenshot. It carries the values with it.
What this tool does not do
- Lender rounding rules differ, so the final figure on your statement may differ by a small amount.
- Rates are treated as fixed for the whole term; a floating rate will change the outcome.
- It does not account for anything you did not enter, by definition.
- Check that each figure is in the unit the label asks for; that is the most common source of a wrong result.
Frequently asked questions
Enter Amount in ₹. Units are printed on the form itself. Match them and no manual conversion is needed.
With the values loaded when the page opens, base amount comes out as ₹1,000.00. Change a value and the number is recomputed on the spot.
It is not stored or transmitted. The calculation happens locally and leaves no trace with us.
It is free to use, with no premium tier holding back the useful parts.
The calculation is precise; the assumptions are yours. Change one input and you will see how sensitive the result is, which is usually the more useful insight.