You can test it yourself. All you need is a glass eyedropper that measures 1 ml, a 5 gallon bucket, and an empty 2 liter soda bottle.

1) Fill the soda bottle (to the normal fill level) and pour it into the bucket. Do this five times until you have 10 liters (less than 5 gallons).

2) Use the eyedropper to add 1 ml of bleach to the water.

3) Mix

4) measure the bucket's FC--that number (say, 5.25ppm) will be EXACTLY the same as the bleach's strength--5.25% in our example.