Stock Split Calculator
Convert an Indian face-value announcement such as ₹10 to ₹2 into the new share count, theoretical adjusted price and revised cost per share.
Learn the concept firstWhat Is a Stock Split? Ratio, Face Value and Examples→2 · Your calculated post-split position
- Whole / fractional shares
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- Share-count change
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Observed price is a market scenario, not a prediction. F&O figures are mechanical references until the exchange circular confirms the final strike rounding, market lot and contract treatment.
- Observed vs theoretical
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- Pre-event equivalent
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Theoretical figures preserve mathematical comparability; they do not forecast the first traded price. Company and exchange filings govern fractional treatment and final F&O adjustments.
A split changes the unit—not your starting wealth
Think of it like exchanging one large unit for several smaller units. At the mechanical reference, you own more shares at a proportionately lower price, while the total holding value stays continuous.
Share count, face value, market price per share and comparable average cost.
Total holding value and total acquisition cost at the theoretical adjustment.
Actual traded price, fractional treatment and final exchange F&O adjustments.
Use the split calculator in four steps
Start with the company announcement and core share calculation. Open the optional research layer only when you want to compare the traded price or F&O reference after the mechanical adjustment.
- 1Enter the holdingShares, market price and optional average cost before the event.
- 2Copy both face valuesUse the old and new face value exactly as filed.
- 3Read the mechanical resultCheck revised shares, theoretical price and value continuity.
- 4Research the traded outcomeCompare the observed price and verify final F&O figures separately.
More shares, lower comparable price
When the old face value is higher, the share factor exceeds one. Share count rises and per-share figures fall proportionately.
Fewer shares, higher comparable price
When the new face value is higher, the factor is below one. The calculator exposes any mathematical fractional remainder for a filing check.
A reference, not a prediction
The first traded price can differ from the mechanical reference. Use the value curve to test the effect without rewriting the split arithmetic.
The share count changes; the starting value does not
One hundred shares at ₹1,000 become 500 mathematical shares at a theoretical ₹200. An ₹800 average cost becomes ₹160 per share. Both sides equal ₹1,00,000 at the mechanical reference.
A mathematical fraction may be aggregated, sold or handled another way. The calculator deliberately does not promise a fractional credit or cash payment.
The research view applies the standard mechanical factor. Final strike rounding, market lot and contract treatment remain exchange-controlled.
Frequently asked questions
How do I use the Stock Split Calculator?
Enter the shares held before the split, the pre-event market price, and the old and new face values announced by the company. The calculator shows the new share count, theoretical adjusted price, comparable cost per share and value continuity first. Observed price and F&O fields are optional research inputs.
What does a stock split from ₹10 to ₹2 mean?
The adjustment factor is ₹10 divided by ₹2, or 5. A holding of 100 shares becomes 500 mathematical shares. A ₹1,000 pre-split market price has a theoretical reference of ₹200 after the split, before normal market movement.
Does a stock split increase my investment value?
No. A stock split changes the number of shares and the comparable per-share figures in opposite directions. At the mechanical adjustment, the total holding value remains continuous; the traded price can then move with the market.
Can this calculator handle a reverse split or share consolidation?
Yes. Enter a new face value higher than the old face value. For example, ₹5 to ₹10 produces a 0.5 factor, so the mathematical share count halves and the comparable price per share doubles. Any fractional outcome must be checked against the company filing.
How does a stock split affect my acquisition cost per share?
The calculator keeps the total entered acquisition cost continuous and divides or multiplies the comparable cost per share by the same event factor. Section 90(9)(d) of the Income-tax Act, 2025 provides that cost for shares arising from subdivision or consolidation is calculated with reference to the cost of the shares from which they are derived. Use transaction-level records for final tax reporting.
What happens if the split or consolidation creates a fractional share?
The calculator shows the mathematical whole and fractional components but does not promise a fractional credit or cash payment. The company scheme, registrar communication and exchange filing govern how any fraction is actually handled.
Are the F&O strike and market-lot adjustments final?
No. The Research Lab applies the standard mechanical factor. NSE states that stock-split and consolidation adjustments can change strike price, position and market lot, with final rounding and contract treatment determined by the exchange circular.