Solution Stability Calculator

How this calculator is organized: Solution stability is split into five completely independent calculation modes — Initial, 24 Hours, 48 Hours, 72 Hours, and Custom. You must pick one mode before anything calculates — there is no default. Inside every time-point mode, you then pick one of two independent boxes — Standard Solution Stability or Sample Solution Stability — each with its own complete data set (its own fresh Standard system suitability, its own Room Temperature and/or Refrigerator readings — you add RT, RF or both, whichever your protocol used — and for the Sample box, its own formula constants). Nothing is ever shared or mixed between modes or between the Standard/Sample boxes — each one calculates fresh, on its own data, exactly like re-running a separate worksheet. Each Standard box also has its own required Reference % field (no default — you type in whatever your SOP specifies) that its %Difference is measured against, and each Sample box has its own Initial Result % field (with a one-click, fully editable "use Initial's result" convenience) that its %Difference is measured against — both are plain data fields inside that box, never a live formula link to another mode.