DESIGNED FOR TRADERS, BY TRADERS.

DESIGNED FOR TRADERS, BY TRADERS.

The UK's Best Lot Size Calculator.

The most accurate and comprehensive lot size calculator in the UK, helping you calculate your forex lot sizes correctly, every time. 

Your results include spread costs, a risk assessment per trade, risk per pip & risk in monetary terms.

How to Use Lot Size Calculator.

Lot size calculations in less than 15 seconds.

Simply enter the currency of your account, forex pair you want to trade, the timeframe, direction and amount you want to risk (% or monetary), enter the stop loss level and take profit. Our calculator also adjusts based on your broker’s estimated spreads so enter your broker and your experience level to get the full results.

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Lot Size Calculator

Enter your trade and select your options. Then click "Calculate" for a summary of your lot size, volatility, risk, and more!

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CALCULATE YOUR FOREX LOT SIZES QUICKLY

The UK's Best Forex Lot Size Calculator

Lot Size Calculator is the UK’s leading forex lot size calculator tool to quickly calculate your forex lot sizes quickly and efficiently with zero email sign-ups or complex processes.

Fast and Easy Calculations

Always accurate and up-to-date lot size calculations for accurate sizing on the go.

Detailed Broker Reviews

Our sister site Trading Brokers features all the latest forex & UK trading broker reviews for UK traders. We are dedicated to helping Uk traders of all experience levels find their perfect forex broker.

Always Free for UK Forex Traders

Our Forex Lot Size Calculator as well as our other reviews and guides are always free to use for UK traders of all skill levels.

Lot Size Calculator Home Page

Dedicated Trading Company

We are a UK based company focused on providing free UK-focused trading tools, reviews and guides.

Our businesses include Spread Bet & Trading Brokers which are dedicated to providing resources and information for financial spread betting and trading with detailed reviews and guides for UK traders.

Position Size Calculator

Subscribe to our free newsletter hear about our launch of the Position Size Calculator and other tools which will accelerate your forex trading & positioning strategy .  

Helping you understand stock trading, manage risk more effectively and conduct quick & easy  calculations and more. 

Simple and Accessible Tools

We will always retain a commitment to producing fun, informative and most importantly, accurate tools for UK investors and traders.

FEATURES

Why Calculate Forex Lot Sizes?

Lot Size Calculator helps traders understand forex trading quickly and easily by assisting with your lot sizing – quickly highlighting volatile currencies and showing you risk may be high. We help guide traders completely for free by doing the calculations for them quickly and easily.

Always free for UK traders

Quickly find forex lot sizes for trades

Top trading tool in the UK

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FEATURES

Quickly Assess Forex Lot Sizes & Risk Per Trade.

Understanding pair volatility and risk per trade is complex, we’ve simplified the process but showing you both the currency pair historic volatility as well as whether your risk per trade is high or low based on historic ATR*.

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The UK's Dedicated Lot Size Calculator Helping You with Forex Lot Sizing

Whether you’re a new trader or an experienced veteran of the industry, Lot Size Calculators are a useful tool to quickly assess position sizing and risk management – a crucial part of your trading experience.  

Secure and confidential

We do not use, process or store any of your personal information – we don’t even ask for it. 

Helpful customer service

Feel free to get in touch with us if you notice any discrepancies in the calculator or want to contribute by suggesting features.

No hidden fees

We have zero fees and are completely funded independently and from our broker parters at no additional cost to you. 

Most comprehensive calculator

We have the most competitive forex lot size calculator in the industry, working to constantly improve and develop our tools daily.

Dedicated Trading Resource

We are committed to UK trading and UK traders, providing free guides and resources on our sister sites.

Easy & Simple Calculations

Using advanced technology, we build and develop complete and comprehensive, free to use, engaging tools for UK forex traders.

Trusted by Leading Forex Traders & Brokers in the UK

About Us

Our website is more than just a calculator; it is a comprehensive resource for traders of all levels.

The Lot Size Calculator supports real-time calculations, ensuring accuracy and efficiency. We designed it to be as user-friendly as possible with a clean interface that guides traders through the input process. Beyond the calculator itself, we offer educational content explaining the nuances of lot sizes and their importance in trading. This combination of practicality and knowledge equips traders to make informed decisions and build sustainable strategies.

Have any questions? Don’t hesitate to contact us!

See More

  • What is a Lot Size?

    A lot size refers to the standardized quantity of a financial instrument that is traded in a single transaction. In forex trading, for instance, one standard lot represents 100,000 units of the base currency. Understanding lot sizes is critical for traders as it directly affects the value of a trade and the associated risk.

  • What is a Lot Size Calculator?

    A Lot Size Calculator helps traders, usually forex traders, with calculating their correct lot size - the number of standard lots often quoted in 100,000 units - for trading a particular currency pair. It is a very useful tool for both beginner traders and advanced traders for understanding their risk exposure and position size per trade.

  • How Do Lot Size Calculators Help with Trading?

    Lot Size Calculators are the best and quickest way to understand how many lots (or fractional lots), you should trade. They help with pre-trading analysis and evaluation before entering a trade. 

  • What Are the Types of Lot Size?

    Types of Lot Sizes: Standard Lot: 100,000 units (used by institutional and experienced traders). Mini Lot: 10,000 units (ideal for intermediate traders). Micro Lot: 1,000 units (popular among beginner traders). Nano Lot: 100 units (used for practice or very low-risk trades). You will often hear a lot size being 100,000 units of a currency, this is one standard lot - the other lot sizes may or may not be available on your broker platform. 

  • Why Lot Size Matters?

    Lot size calculations are not just a mathematical exercise; they are a cornerstone of risk management in trading. Choosing the wrong lot size can expose traders to undue risk, potentially leading to significant losses, especially when leveraging capital. For instance, in forex trading, even a small market movement can have a magnified impact due to leverage, making precise calculations indispensable. The importance of lot size extends beyond risk management to influence overall trading efficiency. Calculating lot sizes ensures that trades are proportionate to account size, stop-loss distances, and risk tolerance, preventing over-leveraging and maintaining the sustainability of trading strategies.

  • The Best Lot Size Calculator in the UK?

    LotSizeCalculator.co.uk is the best lot size calculator in the UK. It is designed to simplify the complexities of calculating lot sizes, providing traders with a reliable and easy-to-use tool. By inputting critical variables such as account balance, risk percentage, stop-loss distance, and the trading instrument, users can instantly determine the appropriate lot size for their trades. We remove the guesswork, allowing you to focus on strategy and execution rather than manual calculations. We ensure our calculator is versatile, supporting various forex pairs from USD, GBP and AUD pairs to name a few, and we make this accessible across all devices, ensuring usability whether you are at home or on the go.

  • How is Lot Size Calculated?

    Lot size calculation involves a straightforward formula, but the underlying factors can be complex. The process begins by determining the amount of capital to risk on a single trade, usually a percentage of the total account balance. This risk amount is then divided by the product of the stop-loss distance (measured in pips) and the pip value of the chosen instrument. The resulting figure represents the appropriate lot size for the trade. For example, a trader with an account balance of £10,000 risking 2% with a stop-loss of 50 pips on EUR/USD would need to calculate the pip value for that pair and input all the variables into the formula. The LotSizeCalculator.co.uk tool automates this process, providing quick and accurate results tailored to each trade.

  • The Role of Lot Size in Risk Management

    Effective risk management starts with the selection of an appropriate lot size. By tailoring lot sizes to specific trades, traders can limit their exposure to losses while maximising potential gains. This approach prevents emotional decision-making and overtrading, which are common pitfalls among new traders. For example, using a micro lot instead of a standard lot significantly reduces the financial impact of adverse market movements, allowing traders to withstand periods of volatility. LotSizeCalculator.co.uk helps you simplify this process by ensuring that trades are scaled correctly, in line with your individual risk tolerance and market conditions.

  • Are Lot Size Calculators Free?

    Yes lot size calculators are normally offered for free by brokers or trading platforms, however, dedicated lot size calculators like the one offered by lotsizecalculator.co.uk offer more detailed information and support on things like pair volatility, risk:reward as well as providing lot calculations.

How to Use Our Lot Size Calculator (Step-By-Step)

Our Lot Size Calculator is specifically designed to help traders accurately manage their risk in Forex, commodities, and cryptocurrency trading. Follow these detailed steps to optimize your trading performance:

Lot-Based vs Standard Lot Size Calculation on Lot Size Calculator
  • Step 1: Choose Calculation Mode

  • Standard Mode: Calculate the recommended lot size based on your account balance, risk preferences, and stop-loss settings.
  • Lot-Based Mode: Calculate potential risk, pip value, and overall risk assessment for a specific lot size you’re considering.

 

  • Step 2: Select Your Account Currency

Choose your trading account currency (GBP, USD, EUR).

The selected currency directly affects your risk calculations and pip valuations.

Account Current Selector on Lot Size Calculator
Selecting Currencies to trade on Lot Size Calculator
  • Step 3: Select Your Trading Asset

Choose your asset from the comprehensive dropdown menu:

  • Forex: Major currency pairs (e.g., EUR/USD, GBP/USD), crosses (e.g., EUR/JPY, GBP/CHF).
  • Commodities: Gold (XAU/USD), Oil.
  • Cryptocurrencies: Bitcoin (BTC/USD), Ethereum (ETH/USD).
  • Step 4: Determine Your Trade Direction

Clearly specify whether you are planning to:

  • BUY: Stop-loss placed below your entry price, take-profit above.
  • SELL: Stop-loss placed above your entry price, take-profit below.
Buy vs Sell calculation on Lot Size Calculator
Timeframe Selection on Lot Size Calculator
  • Step 5: Choose Your Trading Timeframe

Select your trade analysis timeframe (e.g., 1-minute, 15-minute, hourly, daily).

This setting adjusts the volatility-based risk classification in your calculation.

 

  • Step 6: Input Your Account Balance (Standard Mode Only)

Enter the exact total capital available in your trading account.

Accurate account balance entry is critical for correct risk and lot size calculations.

Account Balance Type-In for Lot Size Calculator
Risk Parameter Selector on Lot Size Calculator
  • Step 7: Set Your Risk Parameters (Standard Mode Only)

Choose between:

  • Percentage Risk: Define how much of your account you’re willing to risk per trade (commonly 1%–3%).
  • Fixed Money Risk: Specify an exact amount in your account currency (e.g., £250).

 

  • Step 8: Enter Stop-Loss and Take-Profit

Clearly define your stop-loss and take-profit levels:

  • Enter in pips or exact price levels.
  • The accuracy of your stop-loss directly impacts your risk calculation.
Stop Loss & Take Profit Selector on Lot Size Calculator
Lot-Based Calculation to Enter Lot Size on Lot Size Calculator
  • Step 9: Enter Desired Lot Size (Lot-Based Mode Only)

Specify the lot size you plan to trade.

This mode calculates your potential monetary risk, pip value, and overall risk rating based on your chosen lot size.

  • Step 10: Select Your Broker

Choose your broker from the provided list to account for broker-specific nuances in risk management.

Broker Selector on Lot Size Calculator
Experience Level Selector on Lot Size Calculator
  •  Step 11: Enter Your Trading Experience Level

Select your experience level (1–2 years, 3–4 years, 5+ years).

Helps tailor the calculator’s insights to match your trading proficiency.

  • Step 12: Instantly Calculate and View Results

Click “Calculate” to receive immediate, detailed results:

  • Recommended Lot Size: Precisely tailored to your risk settings.
  • Amount at Risk: Total monetary risk clearly displayed.
  • Pip Value: Exact value per pip movement.
  • Risk Level: Clearly indicated as High, Medium, or Low based on market volatility and your input.
  • Risk:Reward Ratio: Potential reward compared clearly to the risk taken.
Visualised Risk Assessment on Lot Size Calculator
Lot Size Calculator Summary / Overview
Key Features

What Makes Our Lot Size Calculator Special?

Our Calculator is the only dedicated lot size calculator available for traders. Most brokers, publishers and websites simply use lot size calculators as an add-on to their site. Our site ensures we are the most accurate and efective calculator on the market by constantly updating, refining and improving our experience for users. 

Instant and Precise Calculations

Real-time calculations using advanced algorithms tailored to market volatility and personal risk settings.

FAQS

Frequently asked questions

Is this a Free Lot Size Calculator?

Yes, Lot Size Calculator will always be free to use for British traders. We work with partners in the trading space to help fund our continued operations. See here for more information. 

What is a Lot Size?

In forex trading / currency trading a ‘lot’ is a standard unit of measurement that equates to 100,000 units of a particular currency. Our calculator helps traders understand the correct sizes they can use to trade effectively.

Why Do I Need a Lot Size Calculator?

If you are interested in trading forex or currencies, our lot size calculator will help not only with understanding the lot sizes you should / could use when trading but also with currency pair volatility, overall risk profile and more.

Do You Provide any Broker Reviews?

Lot Size Calculator does not explicitly provide any broker reviews or trading guides. We are not a broker review site or independent review and comparison site. For UK traders interested in trading please visit our sister site Trading Brokers or for those interested in forex spread betting visit Spread Bet.

What is the Right Size to Trade?

There is no ‘correct’ position size. The position sizing depends on a variety of factors including the currency pair, the ATR, your account size and the amount you want to risk per trade. 

Who is the Best Broker to Trade Forex?

There is no ‘best broker’. Broker selection is an important part of your trading process and choosing a right broker depends on a variety of factors. If you are interested in choosing a trading broker visit Trading Brokers.

Why Do You Need a Lot Size Calculator MT4?

A lot size calculator MT4 allows you to quickly calculate your lot sizes directly within the Metatrader platform. If you do not accurately calculate your lot size before a trade it could result in taking too much (or even too little) risk. The in-built lot size calculator in MT4 allows you to quickly conduct these kinds of calculations. 

Lot Size Calculator for Gold?

Our lot size calculator for gold has just been improved as of January 2025 to include (XAU/USD) allowing UK traders to quickly understand what lot sizes then can trade on the commodity. We added this to provide detailed and comprehensive information on trading gold lot sizes.

Lot Size Calculator for Bitcoin?

Although trading Bitcoin in heavily regulated in the UK, we’ve added a Bitcoin Lot Size Calculator to our calculator in order to hypothetically show UK traders what trading Bitcoin looks like in terms of the respective lot sizes. 

The UK's Leading Lot Size Calculator for Traders of All Levels

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