All Investment Tools.
Free. No Signup.
Every calculator you need — from DCA averaging to options Greeks. Built for serious investors.
Which calculator should I use?
Our 16 calculators cover the full lifecycle of an investment decision. Pick the one that matches what you're trying to figure out right now — there's no setup, no signup, and every tool supports 10 currencies.
I'm down on a position
Use the Stock Averager to model what additional buys do to your average price, then the Break-Even Calculator to find the exit price that recovers your full cost including brokerage.
I'm deciding how much to risk
The Position Size Calculator works backwards from the loss you can afford to the share count that produces it, so the size of the trade is set by your stop rather than by a round number. Do this before you average down, not after.
I'm sizing a new position
Not sure how many shares you can buy with a fixed budget? The share affordability calculator divides your cash by the share price (after brokerage) to show the maximum whole shares, total cost, and leftover.
I'm about to sell
The Target Price Calculator shows P&L at any exit price. Run the result through the Capital Gains Calculator so the short-term vs long-term tax difference doesn't surprise you.
I'm measuring returns
The CAGR Calculator normalizes returns across uneven horizons so you can fairly compare a 3-year holding to a 7-year one. To check a single trade instead, the Stock Profit Calculator gives profit, percentage return and break-even with fees included.
I'm trading options for the first time
Start with the Options Greeks Calculator to understand Delta, Theta, Gamma, Vega before you trade. Then use Strategy Suggestions to pick a setup that matches your market view.
I'm running a multi-leg strategy
The Options Strategy Builder handles iron condors, butterflies, and verticals. Pair it with the Options Profit Calculator's P&L heatmap to see how the position behaves across prices and expirations.
I'm worried about a market drop
The Hedging Helper sizes protective puts and collars against your existing portfolio so you don't over- or under-hedge.
I'm holding through earnings
Run your option positions through the Volatility Impact Calculator first — IV crush after earnings is usually a larger move than the directional swing. Income investors should also check the Dividend Estimator.
Basic Investment Tools
Essential calculators for stock investing and portfolio planning
Position Size Calculator
Size a position from the loss you can afford, not a round number.
Use CalculatorStock Profit Calculator
Profit, return and break-even on a trade, fees included.
Use CalculatorSpecialised Calculators
Focused variants for a specific question, each with a worked explanation
Cost Basis Calculator
Track your basis across multiple purchase lots for tax reporting.
Averaging Down Strategy
Plan a tranche ladder and cap the position before the first add.
Theta Decay Calculator
Model how an option's time value bleeds out as expiry approaches.
CAGR vs IRR
See why IRR — not CAGR — is correct once you add money over time.
Shares Affordability
Work out how many shares a given budget actually buys.
F&O Strategy Tools
Advanced tools for futures and options trading
Frequently asked questions
Common questions about using our calculators.
Are these calculators really free? What's the catch?+
Every tool on this page is free, with no signup, no email gate, and no paywall. We monetize through non-intrusive AdSense and affiliate links on a few blog posts. Your inputs stay in your browser — we don't store positions, portfolios, or personal data.
Which calculator should I use if I'm down on a stock?+
Start with the Stock Averager. It takes your existing position, the current market price and the average you want to end up at, and returns the exact number of extra shares that gets you there — plus what they cost after commission. Then run the result through the Break-Even Calculator to find the exit price that returns you to flat.
Which currencies are supported?+
All calculators support USD, EUR, GBP, JPY, INR, CAD, AUD, CHF, CNY, and SGD. We auto-detect your currency from your location on first visit. You can change it from the header at any time and your choice is remembered across sessions.
Do you account for brokerage fees and taxes?+
Several tools do. The Stock Averager, Stock Profit Calculator, Break-Even Calculator and shares affordability calculator all take an optional per-order commission and fold it into the result — a fee charged on every tranche is exactly what makes a small averaging-down plan not worth running. The Capital Gains Calculator handles short-term vs long-term tax tiers. Other calculators show pre-tax, pre-fee numbers unless the tool says otherwise.
Do the options calculators use real Black-Scholes math?+
Yes. The Greeks, profit, and volatility calculators use the standard Black-Scholes-Merton model for European options pricing, including all five Greeks (Delta, Gamma, Theta, Vega, Rho). For American options on dividend-paying stocks, treat the output as a close approximation rather than an exact quote.
Can I use these tools for crypto or ETFs?+
The Stock Averager, Position Size, Stock Profit, Target Price, Break-Even and CAGR calculators are asset-agnostic — they work for any quantity-and-price instrument, including ETFs, crypto, and commodities. The options tools assume equity options with standard 100-share contracts; index options (SPX, NIFTY) work but cash-settled multipliers differ.