Trading is the only place where "I felt good about that trade" and "I made money" diverge so often. The best counter-tool isn't optimism — it's math. Six calculators that take 30 seconds each and will save you from at least one bad decision per week.
1. Crypto Profit Calculator
Entry price → exit price → quantity → fees → net P/L in absolute terms and percentage. The fee field matters more than people think: a 0.1% entry + 0.1% exit fee eats 0.2% of every round trip. On a 5% trade, that's 4% of your gross profit.
2. Staking Yield
APY is the annualized rate with compounding. APR is without. Most staking platforms show APR but call it APY. This calculator lets you toggle compound frequency (daily / weekly / monthly / annually) so you see the actual end-of-year number. Plot included.
3. Dollar-Cost Averaging
DCA simulator. Input a buy schedule (weekly / monthly / on-dip) and a price series — see your average cost, total quantity, and current value. The takeaway is almost always: consistent DCA beats your best market-timing instinct over 5+ years. Run the numbers and stop arguing with yourself.
4. Stock Average
You bought 100 shares of X at ₹500. Then it dropped to ₹400. You're considering buying more. What's your new average if you buy 50 more? Answer: (100×500 + 50×400) / 150 = ₹466.67. The calculator does this for any number of buys and is unreasonably useful during corrections.
5. P/E Ratio
Price / Earnings per share. The most-quoted valuation metric in equity research. Useful for cross-stock and cross-sector comparison; nearly useless in isolation. A P/E of 30 is high for a bank, low for a growth-stage SaaS company. CalcMaster shows the sector average alongside (when known) so you have a yardstick.
6. Position Size
The most important calculator on this list and the one nobody uses. Formula: (account size × risk %) / (entry − stop). Tells you exactly how many shares/coins/contracts to buy so a stop-loss costs you a predefined fraction of your account. Risk 1% per trade and you can be wrong 100 times in a row before going to zero.
The meta-lesson
Five of these six calculators prevent trades. They tell you what something is worth, what it'll yield, what you can risk. Only Crypto Profit is used after the trade — and even then, it's a journal, not a celebration.
Open the crypto & stock category for the full list.