Learn the concept. Then run your own numbers.
growwithsip is an independent financial education website for salaried readers in India. Start with a guide SIP vs FD, leftover 80C, inflation in today’s rupees understand the assumptions, then open the matching calculator. Formulas stay on the page. Results are illustrations, not personalized advice.
What growwithsip is
An independent financial education website with transparent calculators. Written for salaried readers in India who want to understand a choice before they type an amount.
Guides before the worksheet
Articles explain leftover 80C, inflation, sequence risk, and compounding assumptions. Calculators then run those formulas in your browser.
No login wall
No account, no phone number, no “results by SMS.” Calculator inputs stay on your device.
Independent and transparent
Educational content with documented calculation methods. Not a product distributor and not personalized advice.
Learn → Understand → Calculate
Learn the concept, understand the assumptions, then run your own numbers.
Learn the concept
Open a comparison or a method note leftover 80C, inflation, SIP vs FD, so the product matches the job.
Understand the assumptions
See what is illustrated (a constant return, a notified PPF rate, a reducing-balance EMI) and what is not a forecast.
Calculate with your numbers
Type amount, rate, and tenure. The page shows the formula and the year-by-year table. Export a snapshot if you want a worksheet, not a quote.
Start with a guide
These are the articles. Each one links to a calculator if you want numbers.
If this is your situation
Each row is a situation, a guide, and the calculator that uses that method. Read first, then open the matching worksheet.
| If you | Read | Then open |
|---|---|---|
| EPF already ate most of 80C | Leftover 80C after EPF | ELSS leftover × slab |
| A bonus is already in the bank | SIP vs lumpsum | Lumpsum worksheet |
| Salary will fund the investment | 12% is not a forecast | SIP with inflation |
| You want a monthly cheque from a corpus | SWP sequence risk | SWP loop |
| Today’s house price, a later date | Goal: today’s rupees | Goal planner |
| Same extra ₹10,000 as EMI or SIP | Prepay vs SIP | EMI schedule |
How we calculate
Each calculator on this site is a function in your browser, not a quote from a bank or an AMC. I wrote the functions. If a slider and a paragraph disagree, trust the inputs you typed.
Where the code lives
SIP, lumpsum, step-up, SWP, CAGR, ELSS, FD, RD, PPF, NPS, goal, retirement, and reducing-balance EMI share one module. The pages are wrappers: sliders, tables, charts, method notes. Nothing is sent to a server to compute a corpus.
Inflation is not one switch
SIP, lumpsum, step-up and SWP can deflate a finished pile into today's rupees. The goal planner does not. Retirement inflates today's lifestyle up to the retirement year, then sizes a corpus. Mixing those three on one screenshot is how people under-save for a house. How inflation is applied.
Tax is almost always outside
ELSS leftover 80C is an extra panel, the green 30% box in the form still assumes a free ₹1.5 lakh, often wrong after EPF. NPS 80CCD(1B) is a separate line. FD and RD interest is pre-tax. Equity LTCG on the SIP extras is an illustration, not a filing engine.
What I will not add to look complete
Live NAVs, a scheme picker, a Monte Carlo pretending to be sequence risk, secret inflation on the goal planner, or a phone wall. Full refusal list.
Inflation shrinks the headline
The SIP engine first prints future rupees. Then it deflates them. The goal planner does not do this second step unless you type the grown number.
Engine map
When PPF notified rates or tax slabs change, I update defaults from public notifications. I do not scrape NAVs. Reproduce the lab numbers in Numbers I actually ran. If they drift, write to support@growwithsip.in.
| Page | What the code actually does |
|---|---|
| SIP / ELSS / step-up | Future value of an annuity, monthly compounding. Step-up hikes the debit once a year, then the same loop. |
| Lumpsum / CAGR | A = P(1+r)^t. CAGR is the r that connects two points you already have. |
| SWP | Grow at r/12, then subtract the debit if the balance can stand it. Inflation can step the debit yearly. |
| FD | A = P(1+r/n)^(n t). Default n = 4 (quarterly). Payout FDs are not this curve. |
| RD | Monthly deposits with a quarterly-rate approximation used on this site, not the FD one-shot. |
| PPF | Add the yearly deposit, then one annual notified rate. No monthly PPF credit in this model. |
| NPS | Monthly SIP-like growth, then a hard-coded 60/40 lumpsum/annuity stub. Not a PFRDA quote. |
| EMI / personal loan | Reducing-balance PMT. Personal loan can add extra pay, fees, GST, FOIR still not a lender sanction. |
| Goal planner | Solve SIP and lumpsum for the amount you typed. No inflation slider. |
| Retirement | Inflate today’s lifestyle to retirement, size a corpus at 7% post-retirement in code, then a SIP to that corpus. |
Selected calculators
Use these after a guide, or jump in if you already know the question. Results are mathematical scenarios, not predictions.
What these pages will not compute
Naming what a worksheet cannot do is as useful as naming what it can. These limits are intentional.
Live NAVs or a scheme pick
No AMC feed. A 12% slider is an illustration, not Nifty, not your folio’s TER.
Secret inflation on the goal planner
That page solves against the rupees you type. If the sticker is today’s, you inflate it. I will not hide a second inflation inside the SIP.
Form 16 leftover 80C
ELSS and PPF cannot see EPF. Subtract employee PF yourself. A free ₹1.5 lakh when the cap is full is a wrong tax-saved line.
Monte Carlo sequence of returns
SWP uses one constant rate. A bad first decade can empty a corpus this loop still paints as healthy. The sequence-risk guide is the warning, not a hidden simulator.
Company FD as a bank deposit
DICGC is ₹5 lakh per bank. NBFC “company FDs” typically have none. A fatter coupon is credit risk.
Personalized advice or a product sale
I am a software engineer in Bengaluru. Independent educational content with transparent calculation methods no login wall and no scheme recommendations.
Numbers I actually ran
These are not category averages. They are outputs of src/lib/calculators.ts as this site ships it. Open the link and you should be able to reproduce them.
Same SIP, three constant rates
Rs 10,000 a month for 20 years. You contribute Rs 24 lakh in every bar. Only the illustration rate changes.
About Rs 59.3 lakh / Rs 99.9 lakh / Rs 1.32 crore. Not market history.
Wiring for each engine is in How we calculate, further down this page.
The rest of the guides
Method notes and comparisons that sit behind the featured six. Full index.
Frequently Asked Questions
How this site works, not a mutual-fund encyclopedia.