👑 TradeMistress

Calculators

Professional trading calculators built by a trader, for traders

100% free • No signup required • No email needed

🎯 Why I Built These Calculators

After struggling with confusing online calculators and making expensive mistakes with position sizing, I built my own tools. Simple, UK-focused, and actually useful.

Every calculator on this page is something I use every single day before entering a trade.

📊 Position Size Calculator

Calculate exactly how much to trade based on your risk tolerance.

The single most important calculator for any trader. Get your position size wrong, and even the best strategy will fail.

What It Does:

  • Calculates exact lot size/shares to buy
  • Factors in your account balance
  • Uses your risk percentage (1-2%)
  • Shows your maximum loss in pounds
  • Includes UK stamp duty for stocks

When to Use It:

Before EVERY trade. No exceptions.→ Try Position Size Calculator

⚖️ Risk/Reward Calculator

Evaluate if a trade is worth taking before you enter.

A 60% win rate means nothing if you’re risking £100 to make £50. This calculator shows you if the trade makes mathematical sense.

What It Does:

  • Calculates risk/reward ratio
  • Shows breakeven win rate needed
  • Displays profit potential vs. risk
  • Helps you filter out bad trades

When to Use It:

After identifying entry and stop loss, before committing to the trade.→ Try Risk/Reward Calculator

💰 Profit/Loss Calculator

Know your real P&L after ALL costs.

Your broker shows profit, but does it include stamp duty? Commission? Spread? This calculator shows the REAL number.

What It Does:

  • Calculates gross and net profit/loss
  • Includes all trading costs
  • Shows breakeven price
  • Factors in UK stamp duty
  • Displays return percentage

When to Use It:

After closing a trade to know your true performance.→ Try Profit/Loss Calculator

🇬🇧 UK Stamp Duty Calculator

Calculate the 0.5% stamp duty on UK share purchases.

Stamp duty is easy to forget, but on a £10,000 position, that’s £50 – potentially your entire risk budget!

What It Does:

  • Calculates exact stamp duty (0.5%)
  • Shows total purchase cost
  • Displays cost per share
  • Shows breakeven sell price

When to Use It:

Before buying any UK shares to factor costs into your position sizing.→ Try UK Stamp Duty Calculator

📈 Pip Value Calculator

Calculate how much each pip is worth in GBP (for forex traders).

Forex is quoted in pips. Your account is in pounds. This bridges the gap.

What It Does:

  • Calculates pip value for your lot size
  • Converts to GBP
  • Shows position size in units
  • Displays total position value

When to Use It:

Before entering any forex trade to know exactly what each pip movement means.→ Try Pip Calculator

🛠️ How I Use These Calculators

Here’s my actual workflow for every single trade:

Step 1: Find the Setup

Identify entry point and stop loss based on chart structure.

Step 2: Check Risk/Reward

Open Risk/Reward Calculator

  • Input entry, stop, target
  • Check ratio (must be 1:2 minimum)
  • If ratio is bad → skip the trade

Step 3: Calculate Position Size

Open Position Size Calculator

  • Input account size, risk %, entry, stop
  • Get exact shares/lots to trade
  • Note: If UK shares, stamp duty is already factored in

Step 4: Verify Costs (UK Shares Only)

Open UK Stamp Duty Calculator

  • Input position size
  • Double-check stamp duty amount
  • Confirm it’s factored into risk

Step 5: Enter the Trade

Place order with calculated position size, set stop loss immediately.

Step 6: Track Results

After closing, use Profit/Loss Calculator

  • Input all costs
  • Calculate REAL P&L
  • Log in trading journal

Total time: 2-3 minutes
Confidence: 100%
Math errors: 0

💡 Why These Calculators Are Different

Most online trading calculators:

  • ❌ Overly complicated
  • ❌ Missing UK-specific features
  • ❌ Covered in ads
  • ❌ Require signup
  • ❌ Cost money

My calculators:

  • ✅ Simple (one function per calculator)
  • ✅ UK-focused (stamp duty, GBP, UK tax)
  • ✅ No ads
  • ✅ No signup required
  • ✅ Free forever
  • ✅ Actually useful

🎯 Built for UK Traders

Every calculator includes UK-specific features:

  • Calculations in GBP (£)
  • UK stamp duty factored in
  • UK tax considerations
  • FCA regulation compliant
  • Works with UK trading platforms

📚 Calculator Guides

Want to learn more about using these tools effectively?

💜 Why Everything Is Free

I built these calculators because I needed them. I share them because someone helped me when I was starting out.

No courses to sell. No upsells. No hidden fees.

Just honest tools to help you trade smarter.

If these calculators help you avoid even one position sizing mistake, they’ve done their job.

🚀 Start Calculating

Choose a calculator above and start trading with confidence.

No guessing. No hoping. Just math.

Need Help? Have questions about using these calculators? Get in touch – I’m here to help.

See Them In Action: Check my Trading Diary to see how I use these calculators for every trade.

— Nickie Brown
TradeMistress
Doncaster, England 🇬🇧

Built by a trader who learned the expensive way, so you don’t have to.

Disclaimer: These calculators are tools to help you make informed decisions. They don’t guarantee profitable trading. Trading carries risk. Never risk money you can’t afford to lose. Always do your own research.