Crypto Calculator: Complete Guide (PnL, ROI, Breakeven & Position Size)

Crypto Calculator: The Complete, Practical Guide (Spot & Futures)

A “crypto calculator” is any tool that translates your trade idea into exact numbers—profit, ROI, breakeven, position size, and more—so you can decide before you click buy or sell. In this guide you’ll learn how the most useful crypto calculators work, the inputs they need, and how to apply their formulas in seconds. When you’re ready to run scenarios, try our Free Crypto Profit Calculator.

What is a crypto calculator?

A crypto calculator takes your inputs (entry price, position size, fees, funding, stop-loss/take-profit, etc.) and outputs the numbers that matter: expected P&L, required breakeven price, ROI, risk per trade, and liquidation buffers. Good calculators account for fees and funding so your results match reality.

The most useful types of crypto calculators

Calculator	What it answers
Profit & Loss (PnL)	How much do I make/lose at a given exit?
Breakeven	What exact price makes my net P&L zero after costs?
ROI / % Gain	How efficient is this trade compared to capital at risk?
Position Size by Risk	How big can I trade for a fixed risk (e.g., 1% of equity)?
Risk–Reward (SL/TP)	What’s my R-multiple if I enter here and exit there?
DCA / Average Price	After multiple buys/sells, what’s my true average?
Funding / Fees Impact	How do maker/taker fees and perp funding shift outcomes?

Tip: You can combine them. For example, compute a DCA average, then feed that into PnL and breakeven to plan exits. For hands-on scenarios, open our Free Crypto Profit Calculator.

How to use a crypto calculator correctly (step-by-step)

1. Define the trade: Long/short, entry price, and quantity (Q).
2. Add real costs: Maker/taker fees on both legs and any expected funding/borrow (C in currency).
3. Set exits: Stop-loss and take-profit prices (or desired ROI/target).
4. Run the math: Compute PnL/ROI and breakeven; check risk–reward.
5. Decide: If you need an unrealistic move just to break even, skip or resize.

Core formulas you’ll actually use

Let fee rates be decimals (e.g., 0.001 = 0.10%). Use f_open for entry, f_close for exit. Total fixed costs (funding/interest) are C in currency for the whole position. Quantity is Q.

Spot & Long – Breakeven exit price

P_exit = [ P_entry · (1 + f_open) + C / Q ] ÷ (1 − f_close)

Short – Breakeven buy-back price

P_exit = [ P_entry · (1 − f_open) − C / Q ] ÷ (1 + f_close)

Profit & Loss (generic)

Net PnL ≈ Proceeds after fees − Cost after fees − C. For a long: PnL = Q · [ P_exit · (1 − f_close) − P_entry · (1 + f_open) ] − C

ROI

ROI = PnL ÷ ( Q · P_entry ) (for spot). For margin, divide by initial margin posted.

Position size from account risk

Q = ( Account Risk in $ ) ÷ ( |Entry − Stop| · (1 + fee/slippage buffer) )

Worked examples

Example A — Spot long PnL & ROI

• Inputs: Buy 2 ETH at P_entry=3,000, fees 0.10% each side, C=0, target P_exit=3,240.
• PnL: 2 · [ 3,240·(1−0.001) − 3,000·(1+0.001) ] = 2 · (3,236.76 − 3,003) ≈ $467.52
• ROI (spot): 467.52 ÷ (2·3,000) ≈ 7.79%

Example B — Perp long breakeven with funding

• Inputs: Long 0.5 BTC at 20,000, fees 0.05% each side, total funding C=$10.
• Breakeven: P_exit= [20,000·1.0005 + 10/0.5] ÷ 0.9995 = (20,010 + 20) ÷ 0.9995 ≈ 20,035.02

Example C — Position size from fixed $ risk

• Inputs: Account risk: $150. Entry: 1.2000. Stop: 1.1700. Buffer: 0.10%.
• Size: Q = 150 ÷ ( |1.2 − 1.17| · 1.001 ) ≈ 150 ÷ 0.03003 ≈ 4,996 units

Common mistakes that break your numbers

• Ignoring fees/funding: Tiny percentages shift breakeven more than you think.
• Using market orders blindly: Add slippage to your buffer, especially on alts.
• Forgetting partials: Each partial entry/exit changes averages and fees—track them.
• Confusing leverage with ROI: Leverage magnifies risk; it doesn’t make a bad R/R good.

Open an account & optimize trading costs

Lower fees and deeper books bring your breakeven closer and make slippage smaller. Consider opening on multiple exchanges:

Related: Home • Free Crypto Profit Calculator

FAQ: Crypto Calculator

What does a crypto calculator do?

It converts your trade idea into exact figures—PnL, ROI, breakeven, position size—so you can judge risk–reward objectively.

Does leverage change my breakeven?

Not directly. Breakeven depends on fees and fixed costs (C). Leverage can increase funding/interest and liquidation risk, which indirectly pushes breakeven farther.

How do I size positions by a fixed $ risk?

Divide your planned dollar risk by the distance from entry to stop (and add a small buffer for fees/slippage) to get quantity Q.

Should I include funding and maker/taker fees?

Yes. Model all costs. Funding/interest go into C; maker/taker are your f_open and f_close.

Can I combine calculators (e.g., DCA + PnL)?

Absolutely. First compute your DCA average price, then pass it into PnL and breakeven to plan exits and targets.