I made this calculator because I got tired of throwing away money on failed double-batches. The most important part is the Flour Section. It does the '90% Rule' math for you so you never accidentally make dry cookies again. 🖨️ Pro Tip: Print out 5 copies of the worksheet and tape one to your fridge or keep it on a clipboard. Future You will thank you. https://docs.google.com/spreadsheets/d/1uKBfmx0odSKrWkRCd3-T3Q90q6wDh5JsveX-jUHhCdc/edit?usp=sharing