Potato GDD (Heat Units) Calculator
Calculate growing degree days for potato (base 7°C, ~1400 GDD) and estimate days to maturity.
Potato uses a low base temperature (7°C); tracking GDD predicts tuber bulking and maturity. GDD = (Tmax + Tmin)/2 − 7°C; accumulate from sowing to predict stages and harvest.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Growers use the free Potato GDD Calculator to schedule the crop by accumulated heat units rather than calendar days, improving harvest and stage prediction.
About Potato GDD (Heat Units) Calculator
Potato develops by accumulated heat, not calendar days. With a base temperature of 7°C and roughly 1400 growing degree days to maturity, daily GDD = (Tmax + Tmin)/2 − 7°C. Potato uses a low base temperature (7°C); tracking GDD predicts tuber bulking and maturity. Enter today's temperatures and your accumulated GDD to see today's heat units, the estimated days to maturity at current temperatures, and the progress to harvest.
How to use Potato GDD (Heat Units) Calculator
- 1Enter today's max and min temperature.
- 2Optionally enter accumulated GDD since sowing.
- 3Read today's GDD, days to maturity and progress.
Why use Potato GDD (Heat Units) Calculator?
- ✓Uses potato's base temperature and GDD-to-maturity
- ✓Predicts maturity from heat units, not the calendar
- ✓Tracks progress to harvest
- ✓Free, instant and fully in-browser
Frequently asked questions
What base temperature does potato use for GDD?+
About 7°C. Daily growing degree days are the mean temperature minus 7°C, so little development is credited on days below that threshold.
How many GDD does potato need?+
Roughly 1400 growing degree days to maturity. Potato uses a low base temperature (7°C); tracking GDD predicts tuber bulking and maturity.
Why track heat units instead of days?+
Because temperature drives development: the same GDD total marks the same growth stage whether the season is warm or cool, making GDD a better scheduling tool than days after sowing.
Is this tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline in the field and your data never leaves the device.
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