My work around... Add 125mL of wort to 125mL of water and measure. The 250mL sample measured 14 Plato (1.057 SG after conversion) on my refractometer.

Do you know if there is an online calculator or an equation I can use to calculate my actual gravity? Can I just double the diluted number and call it something like 1.114? Or does the weight of the sugar in the water (vs plain water) completely mess that up?

Ive already pitched yeast so it's too late for any more measurements/data beyond what I have. Thanks in advance, your help is always appreciated!