UK100 lot size calculator
A standard UK100 lot is 1 contract, quoted to 2 decimals, and one point of 1 moves 1 GBP per lot. Feed the calculator your account size, the percentage you are willing to lose and the distance to your stop, and it returns the size that puts exactly that much at risk — rounded down to your broker's lot step so the real risk never comes out above the target.
What makes UK100 different
The FTSE quotes in pounds, so unless your account is in sterling every result passes through a GBP conversion. Its heavy weighting in miners and oil majors means it often moves with commodities rather than with the other European indices, which matters when you are sizing several correlated positions at once.
Contract specification
| Symbol | UK100 |
|---|---|
| Contract size (1 lot) | 1 |
| Quote currency | GBP |
| Quoted decimals | 2 |
| Pip / point size | 1 |
| Pip value per standard lot | 1 GBP |
UK100 pip value by lot size
Values in GBP, the currency UK100 is quoted in. A point here is 1.
| Lot size | Units | Value of 1 point |
|---|---|---|
| Standard (1.00) | 1 | 1 GBP |
| Mini (0.10) | 0.1 | 0.1 GBP |
| Micro (0.01) | 0.01 | 0.01 GBP |
A worked example
- Risk in money: a 10 000 GBP account risking 1% puts 100 GBP on the line.
- Stop distance in price: 100 points × 1 = 100.
- Loss per lot: 100 × 1 = 100 GBP.
- Lot size: 100 ÷ 100 = 1, rounded down to 1.
The example assumes an account in GBP. If yours is in another currency, every figure above gets multiplied by the rate from GBP to your currency, which the calculator applies automatically.
Lot size for a 10 000 GBP account
What each combination of risk and stop distance works out to. Read it as a sanity check on the number the calculator gives you.
| Risk | 50 points | 100 points | 200 points | 400 points |
|---|---|---|---|---|
| 0.5 % | 1 | 0.5 | 0.25 | 0.12 |
| 1 % | 2 | 1 | 0.5 | 0.25 |
| 2 % | 4 | 2 | 1 | 0.5 |
| 3 % | 6 | 3 | 1.5 | 0.75 |
Frequently asked questions
How much is one point worth on UK100?
On a standard lot of 1 contract, one point of 1 is worth 1 GBP. A mini lot is a tenth of that and a micro lot a hundredth. If your account is not in GBP, multiply by the current rate from GBP to your account currency.
What lot size should I use on UK100?
There is no single right size: it depends on how much you are willing to lose and where your stop sits. Decide the loss first — most traders cap it at 1% to 2% of the account per trade — then divide that amount by the loss per lot at your stop distance. The calculator above does exactly that and rounds down to your broker's step.
Why does my broker show a different UK100 lot size?
Almost always because the contract or the point definition differs. Open your platform's contract specification for UK100, compare the contract size against 1 and the tick against 1, and correct them under "broker settings" above. The second cause is the conversion rate when your account currency is not GBP; you can override that too.
What contract size does UK100 use?
This page assumes 1 GBP per point per lot, which is the most common setup, but it is not universal — $5, $10 and $25 contracts all exist. Check yours once in the contract specification and save it as a template; getting this wrong scales every size you calculate by the same factor.
I have a dollar account — does that change the UK100 calculation?
Yes. UK100 settles in GBP, so the loss per lot has to be converted from GBP into dollars at the current rate. The calculator does it automatically and tells you which rate it used, and you can type your broker's own rate if you want the figure to match your platform to the cent.
Educational tool. Check the size in your platform before trading; leveraged trading carries a risk of loss.