The lbs per length which I devised for each course and distance can be obtained from my standard time list (see below) along with the furlong distances to use.

I have highlighted the use of the lbs per calculation (Distance adjustment) below.

So in this example, the lbs per length calculation for 5f trip at the Curragh is

**3.37**, if a horse had run instead over 6f you would adjust the distance and use

**2.82 lbs per length** (See Standard times list).

In this example I used Dave Edwards "Top Speed" going allowance as an example, when I compile my own speed ratings I use my own going allowances

Here is an example how I rated the 2yo

**"Dawn Approach"** over 5f trip at the Curragh on Sunday 25th March.

One thing to note is that I do not use

**Weight For Ag**e in my calcuations, you can if you want.

1. The going time for the race was

**+6.93s** above standard.

2. The going allowance was

**-0.9s/**f per furlong (the yeiding going was slowing the horses down).

3. I use

**.2 secs** per length.

Now for the calculation:

multiply 5 furlongs by the going allowance i.e.

**-0.9**
5 x -0.9 =

**-4.50s**
As the race was run +6.93s outside standard subtract the updated going allowance correction i.e -4.50s. (note that if the going allwance was +4.50s you will have to add the going correction)

+6.93-4.50 =

**+2.43s**.

Now divide the corrected going allowance of +2.43 by .2 secs per length.

2.43 /.2 =

**12.15 lengths**.

multipy the lengths by the lbs. per length calculation which is 3.37 lbs per length for 5f trip at the Curragh.

12.15 x 3.37 =

**40.94**
now subtract the figure 40.94 from 100.

100-40.94 = 59.06 or rounded down

**59**.

As Dawn Approach carried 9st 5lb we now have to adjust the speed figure of 59.

For weight carried over 9st adjust the figure for the rating i.e.

59 + 5lb =

**64** ( this is Dawn Approach speed figure).

So if Dawn Approach had carried 8-11 we would have had to subtract 3lb from his speed figure i.e.

59 - 3lbs =

**56**.

Once you have arrived at any horses speed figure you could add the Weight for age allowance, I don't because it corrupts the ratings.

Compiling speed ratings is easy

Dawn Approach ended up as my highest rated 2yo with a speed figure of

**102**