Maple math, free forever.
The math every sugarmaker needs, from published maple research. No account, nothing to install. Built by the makers of SweetRun.
Draw-off temperature
Your exact syrup finishing temperature from your elevation or today’s barometric pressure. Includes the altitude reference chart.
Open calculator In the app: ShackSap to syrup ratio
The Rule of 86 and Jones Rule of 87: how many gallons of sap per gallon of syrup, and what your collection will yield per tap.
Open calculator In the app: Plan & tapMaple tap calculator
How many taps your trees can support by trunk size, and the sap and syrup to expect from buckets, gravity tubing, or vacuum.
Open calculator In the app: BoilDE filter press
Exactly how many cups of diatomaceous earth your batch needs: straight mix or precharge, early or late season.
Open calculatorWhy these are free
This math belongs to every sugarmaker. The formulas come from published research (UVM Proctor, Cornell Maple Program, USDA), and hiding them behind a paywall would be silly. Use them, bookmark them, share them with your maple club.
SweetRun, the app behind these pages, is the part you pay for: an offline-first production system that maps your sugarbush, logs every run and batch, scores your sap-run forecast, tracks sap freshness, and shows you your real cost per gallon. It works with zero cell bars in the woods, needs no account, and your data never leaves your phone.
Calculators are free everywhere. Your season isn’t.
SweetRun is the system for the part that matters: your logs, your numbers, your economics. Offline, private, and yours. $49.99 a year after a free 14-day trial.
Try SweetRun free for 14 days