Forex Trading Calculators
Five calculators on one data spine: broker spreads come from live UK accounts tested in July 2026, exchange rates are dated on every result, and the leverage maths applies the FCA's retail caps rather than an offshore default.
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Broker Cost Calculator
Your monthly trading cost across 26 FCA-regulated brokers, from our tested spreads
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Position Size Calculator
Lots to trade for your balance, risk and stop distance
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Pip Value Calculator
What one pip is worth in your account currency
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Margin Calculator
Margin required under FCA leverage caps
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Profit / Loss Calculator
Profit or loss for an entry, exit and position size
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Which calculator answers your question
The five tools split by the question asked, not by instrument. Start here if you know the question but not the tool:
- What will a month of trading cost me? The broker cost calculator, then the lowest spread and lowest commission guides for the brokers behind the ranking.
- How many lots should I trade? The position size calculator, which works back from a risk percentage and a stop distance rather than from a lot size.
- What is a pip worth on this pair? The pip value calculator. It is the figure the other four consume, so it is the one to check when a result looks wrong by a factor of ten.
- How much margin does this position tie up? The margin calculator, with the caps explained in our leverage guide and the mechanics in our margin guide.
- What would this trade have made or lost? The profit and loss calculator, worked through in full in our CFD trading examples.
Where the figures come from
Every figure the tools output is traceable. Broker spreads and commissions render from the same dataset our best forex brokers in the UK rankings use, recorded on live accounts by David Levy in July 2026. Exchange rates carry their capture date (20 July 2026 at this build). The margin tiers quote the FCA's COBS 22.5 rules directly, and where a number is missing the tools say so instead of estimating. The capture method is on our methodology page.
The spine is shared: 13 currency pairs, GBP, USD, EUR as account currencies, 26 FCA-regulated brokers in the tested cost dataset, and the FCA's list of 6 major currencies deciding which leverage cap applies. Each calculator states which part of that it uses and defers the rest to the tool that owns it.