Here is a harvest trade calculator I put together for making better harvest trades. Just enter your numbers in the form, click calculate, and the totals with the difference will show up below. This can also be used just to see what your harvest is worth to someone. I use mine for figuring what a good harvest will be for a newbie I may be mentoring.

Crop Mine Theirs Tree Mine Theirs
Raspberry Lemon
Grapes Apple
Beets Orange
Squash Avocado
Basil Fig
Asparagus Prune
Sugar Cane Mamey
Eggplant Pluot
Potato Nectarine
Strawberry Pomegranate
Watermelon Guayaba
Cabbage Persimmon
Sage Apricot
Rice Pear
Wheat Banana
Tomato Plum
Peas Peach
Carrot Cherry
Peppers Mango
Blackberry Coconut
Coffee  
Sunflower  
Corn  
Onion  
Pineapple  
Blueberry  
Rosemary  
Pumpkin  
Cotton  
Broccoli