Free Investing Calculators
Run the numbers. Then research the stock. These tools do the arithmetic. AlphaLens does the research. Not advice.
Margin of Safety Calculator
The cushion between what you think a stock is worth and what it costs today.
Position Size Calculator
Turn your risk tolerance, entry, and stop into a share count and dollar position.
Investment Fee Drag Calculator
See exactly how much fund fees cost you in compounded growth over time.
Compound Interest Calculator
Project a balance forward with monthly contributions, year by year.
Share Dilution Calculator
How new share issuance shrinks your ownership stake, and by how much.
Earnings Quality Scorecard
A 10-item checklist for how much to trust a company's reported earnings.
What’s Priced In? Calculator
Reverse the DCF to find the growth rate today’s price already assumes, then stress-test it 3-5 points lighter.
SBC vs Buyback Dilution Calculator
Whether buybacks actually offset stock-based compensation, or just quietly fund it.
Thesis Invalidation Calculator
Set the metric and threshold that would prove your thesis wrong before you are attached to it.
NorrisAI Accrual Screen
A quarterly, deterministic screen of every US mid-cap for divergence between reported earnings and operating cash flow. Built from SEC XBRL data.
How these connect to AlphaLens
Every calculator here answers one specific, mechanical question — a margin of safety, a fee comparison, a dilution percentage. AlphaLens goes further: it runs 15 structured research frameworks on any US stock, using live prices, filings, and news, to help you form the inputs these calculators need in the first place. Use the tools to check the math. Use AlphaLens to do the research behind it.
Embed any calculator
Each calculator page includes an embed snippet — a simple iframe you can drop into your own site or post. Every embed links back to the full calculator and carries a one-line disclaimer.