Calculator
What the Expense Tracker does
Expense Tracker: calculates Leftover, Ideal Needs (50%) and Ideal Wants (30%) from Monthly Income, Needs (50%) and Wants (30%). Example: monthly income 80000 ₹, needs (50%) 40000 ₹ and wants (30%) 20000 ₹ gives leftover ₹4,000.00.
Give the Expense Tracker your Monthly Income, Needs (50%), Wants (30%) and Savings (20%) and it works out Leftover, Ideal Needs (50%) and Ideal Wants (30%). Adjust anything and the figures re-derive on the spot.
Most people who open the Expense Tracker are savers modelling a goal. Getting the arithmetic right before you sign is cheaper than discovering it afterwards.
There is no back end here. The calculation runs where you are sitting, not on a server somewhere.
The field table, the method and a worked example are documented after the tool for anyone who wants to check the working.
What do the Expense Tracker fields mean?
The Expense Tracker uses 4 inputs. A filled form means you can test one idea immediately instead of sourcing every input first.
| Field | What to enter | Default |
|---|---|---|
| Monthly Income | measured in ₹; accepts 0 to 10000000 | 80000 |
| Needs (50%) | measured in ₹; accepts 0 to 10000000 | 40000 |
| Wants (30%) | measured in ₹; accepts 0 to 10000000 | 20000 |
| Savings (20%) | measured in ₹; accepts 0 to 10000000 | 16000 |
How does the Expense Tracker 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.
If something is off you are told which field, not given a generic failure.
Worked example
These are the values the Expense Tracker loads by default, and the result it produces from them. Below is the same computation the tool performs on load, step by step.
| Monthly Income | 80000 ₹ |
|---|---|
| Needs (50%) | 40000 ₹ |
| Wants (30%) | 20000 ₹ |
| Savings (20%) | 16000 ₹ |
| Leftover | ₹4,000.00 |
|---|---|
| Ideal Needs (50%) | ₹40,000.00 |
| Ideal Wants (30%) | ₹24,000.00 |
| Ideal Savings (20%) | ₹16,000.00 |
How to use it
- Set Monthly Income in ₹ (0 to 10000000).
- Put Needs (50%) in ₹ (0 to 10000000).
- Key in Wants (30%) in ₹ (0 to 10000000).
- Fill in Savings (20%) in ₹ (0 to 10000000).
- Results update continuously rather than on submit.
- Check Leftover, Ideal Needs (50%), Ideal Wants (30%) and Ideal Savings (20%) on the right.
- Copy Link when you want to return to this exact configuration; Print when someone needs it on paper.
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.
- Edge cases at the very limits of the accepted range are handled, but rarely worth relying on.
- The tool trusts your numbers completely, so a mis-keyed digit propagates straight through.
Frequently asked questions
Enter Monthly Income in ₹, Needs (50%) in ₹, Wants (30%) in ₹ and Savings (20%) in ₹. Every input names its unit, and every output does too, which removes the usual source of error.
Monthly Income accepts 0 to 10000000 ₹. Go outside it and you get an error against that specific field instead of a misleading number.
With the values loaded when the page opens, leftover comes out as ₹4,000.00. Adjust any field to see how much the answer depends on it.
No. Your browser is doing the computing, so we could not see the values even if we wanted to.
No charge. Everything on the page is available without signing in.
The arithmetic will match any correct implementation. What it cannot include is the processing fee, the insurance bundled into the offer, or the rate band you actually qualify for.