Money decisions rarely fail because the math is wrong. They fail because we avoid the math, defer it, or trust a sales pitch instead of a spreadsheet. CalcMaster's finance suite is built for one purpose: get you to the number in under thirty seconds, with enough context that you understand what the number means.
This guide walks you through all 24 finance calculators, grouped by intent. If you only read one section, make it the first.
1. Growth calculators — "what will this become?"
These tools assume you have time, money to put in, and patience to let compounding work.
SIP, Lumpsum, Compound Interest, CAGR
The four pillars of long-term investing. SIP answers "if I put ₹X every month, what will it grow to?" — it's the calculator most Indian retail investors search for first. Lumpsum is the one-shot version. Compound Interest is the textbook formula behind both. CAGR runs the math in reverse: given a starting and ending value, what was the equivalent annualized return?
| Goal | Use |
|---|---|
| Plan a monthly mutual-fund SIP | SIP |
| Plan a one-time investment | Lumpsum |
| Compare quarterly vs annual compounding | Compound Interest |
| Reverse-engineer your portfolio's true return | CAGR |
FD, RD, PPF, NPS, EPF
The fixed-return cousins. Banks and the government compute returns differently than you might expect — FD/RD uses quarterly compounding, PPF uses annual compounding on the lowest balance between the 5th and end of the month, NPS has separate equity/debt buckets with different rules, and EPF uses monthly interest accrual but credits annually. Don't trust the bank's "indicative" number — run it yourself.
2. Debt calculators — "what is this loan really costing me?"
EMI, Mortgage, Home Loan vs Rent
The headline EMI is the boring part. The total interest paid is where the real money goes, and it's almost always more than people expect. A ₹50 lakh home loan at 9% over 20 years has an EMI of ~₹45,000 — and total interest of ₹58 lakh, more than the principal itself.
Run EMI for any loan, Mortgage for home loans specifically (it lets you toggle prepayment scenarios), and Home Loan vs Rent when the buy-or-rent debate comes up at family dinner.
3. Income & tax calculators
Salary, Income Tax, HRA, Gratuity — these are the ones that get used once a year (March in India) and then forgotten. Bookmark them. The Income Tax calculator does old-regime vs new-regime side-by-side so you can stop guessing which one wins.
4. Business & investing math
- ROI — return on investment for any deal
- Profit & Loss — margin, markup, breakeven percentage
- GST — inclusive ↔ exclusive in both directions
- Discount — actual savings on "70% off + 20% off" stacked offers (it's not 90%)
- Break-Even — fixed cost / contribution per unit
- Net Worth — assets − liabilities, the single most underrated personal finance number
5. Quick-conversion finance
Currency Converter for FX, Simple Interest for short-term loans, and that's the lot.
The one thing this guide can't do for you
Tell you which calculator to use. That's the job of the question you're trying to answer. Start with the question — "will my retirement corpus last?", "is this loan worth it?", "should I rent or buy?" — and the right tool will be obvious. If you're stuck, browse the finance category and skim the names.
Got feedback or a calculator you'd like added? Email mahendrapuniya92@gmail.com.
