Stock Split Calculator
Calculate your new share count, price per share, and total portfolio value after a stock split — both forward splits (2:1, 7:1, 20:1) and reverse splits (1:2, 1:10). 9 famous-split presets included.
What powers the Stock Split Calculator
Forward and reverse splits
9 presets from famous splits (Apple 7:1, Tesla 4:1, Alphabet 20:1)
New share count + new price + total value comparison
8 currencies
Shows that total portfolio value is unchanged
Why the Stock Split Calculator is different
Browser-native
The Stock Split Calculator runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- Before-and-after position size after a split
- Understanding why your share count changed in your brokerage
- Reverse-split scenarios (avoiding delisting)
- Historical analysis of stock prices pre/post-split
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.