IPO calculator for Indian issues: how much to bid and what you might make
Applying for an IPO in India starts with arithmetic: the cost of one lot at the upper end of the price band, how many lots fit under your category’s limit, and how much money gets blocked in your bank account. This IPO calculator does all three for retail investors (up to ₹2 lakh), small and big non-institutional investors, and the employee and shareholder quotas, and shows the minimum and maximum lots for every category side by side.
It then works out the listing-day result for the shares you are allotted at the price you expect or the price they actually listed at — after STT, exchange and SEBI charges, the DP charge, brokerage and GST, and an estimate of the 20% short-term capital gains tax. A separate panel turns the subscription figure into a rough chance of getting an allotment. Grey-market premium is left out on purpose: it is unofficial and unregulated.
How to use the IPO Application & Listing Gain Calculator
- Enter the upper end of the price band and the lot size from the offer document.
- Choose your category. Leave Lots you bid for empty to bid the maximum, or type your own number.
- Enter a listing or selling price and the lots you were allotted (usually one for retail when the issue is oversubscribed).
- Set your brokerage and DP charge, and whether to include the tax estimate.
- Enter your category’s subscription (times) from the exchange’s final bid data to see the allotment estimate.
IPO Application & Listing Gain Calculator features
Every investor category
Retail, small NII, big NII, employee and shareholder quotas with their minimum and maximum lots.
Real selling charges
STT, exchange and SEBI fees, DP charge and GST from the same dated rules as the stock profit calculator.
Tax estimate
Short-term capital gains at 20% plus 4% cess, with surcharge, and no tax on a listing loss.
Allotment odds
A transparent estimate from subscription times, including several family PANs.
Discounts
Employee or retail discount per share reduces your cost and the amount blocked.
Worked example
An issue priced at ₹480–₹500 with a lot of 30 shares costs ₹15,000 a lot at the upper band. A retail investor can bid up to ₹2,00,000, so the maximum is 13 lots (₹1,95,000 blocked). A small NII bid must be above ₹2 lakh — at least 14 lots — and up to ₹10 lakh (66 lots); a big NII bid starts at 67 lots.
If one lot is allotted and the shares list at ₹600, the gross gain is ₹3,000 (20%). Selling charges come to about ₹57.61 and the short-term gains tax to about ₹615.76, leaving ₹2,326.63. With the retail portion subscribed 50 times and most applicants bidding one lot, the chance of an allotment is roughly 1 in 50.
SEBI rules behind the numbers
Source: SEBI (Issue of Capital and Disclosure Requirements) Regulations, 2018, Regulation 32, as in force in October 2026. When the retail portion is oversubscribed, shares are allotted by lottery so that as many applicants as possible get one lot; small NIIs who win get the minimum application size. Shares list three working days after the issue closes (T+3). Applications use ASBA, and UPI mandates work up to ₹5 lakh. SME IPOs follow separate rules with a higher minimum application, so these retail limits do not apply to them.
| Rule | Book-built issue, Reg. 6(1) | Issue under Reg. 6(2) |
|---|---|---|
| Qualified institutional buyers | Not more than 50% | At least 75% |
| Non-institutional investors | At least 15% (⅓ for ₹2–10 lakh bids, ⅔ above ₹10 lakh) | Not more than 15% |
| Retail individual investors (up to ₹2 lakh) | At least 35% | Not more than 10% |
Selling on listing day: charges and tax
Selling allotted shares is a delivery sale: STT of 0.1%, exchange and SEBI fees, a DP charge and GST apply, and there is no stamp duty on the sale. Gains on shares held for 12 months or less are short-term and taxed at 20% (section 196 of the Income-tax Act, 2025) plus cess; the ₹1.25 lakh exemption is for long-term gains only. For a full trade with several lots, use the stock profit calculator; for your whole year’s gains, the capital gains tax calculator.
IPO Application & Listing Gain Calculator FAQ
How do I calculate the IPO amount for one lot?
Multiply the upper end of the price band by the lot size. At ₹500 and 30 shares, one lot is ₹15,000. The IPO calculator shows this and the most lots each category can bid.
What is the maximum a retail investor can apply for?
₹2 lakh. With a ₹15,000 lot that is 13 lots (₹1,95,000). Bids above ₹2 lakh count as non-institutional.
Does applying for more lots improve my retail allotment chance?
No. In an oversubscribed retail book every valid application has the same chance of one lot, so a one-lot bid has the same odds as a maximum bid.
How is IPO listing gain calculated?
Listing gain % = (listing price − issue price) ÷ issue price × 100. The calculator also deducts selling charges and estimates short-term capital gains tax.
Is the allotment probability accurate?
It is only an estimate: winners ÷ applications, from the subscription times and the average bid size you enter. The registrar’s actual lottery and rejected bids change the real odds.
Why is grey market premium not included?
GMP is unofficial, unregulated and often wrong. Enter your own listing price estimate — or the actual listing price after the shares list.