pH Calculator

Check if your plants are in the comfort zone.
The chart allows you to check if your plants get all the nutrients necessary for their development or if they are waiting for a specific element. The shortcomings begin when an item becomes available at least 60% of the plant.
You'll notice that plants grown in soil or compost need a pH less acid than those grown in hydroponics or coco.
SOIL GROWING pH CHART (topsoil, peatmoss, compost)
acid
pH		 N P K S Ca Mg Fe Mn B Cu Zn Mo ▲▼pH
5.0 50% 30% 50% 50% 20% 10% 80% 80% 70% 75% 75% 30% ▲
5.1 55% 30% 55% 55% 20% 10% 80% 80% 75% 75% 75% 30% ▲
5.2 60% 35% 60% 60% 25% 15% 80% 80% 80% 75% 75% 35% ▲
5.3 65% 40% 65% 65% 30% 20% 80% 80% 90% 75% 75% 40% ▲
5.4 70% 45% 70% 70% 35% 25% 80% 80% 95% 75% 75% 45% ▲
5.5 75% 50% 75% 75% 40% 30% 80% 80% 100% 75% 75% 50% ▲
5.6 80% 55% 80% 80% 45% 33% 80% 80% 100% 75% 75% 50% ▲
5.7 85% 60% 85% 85% 55% 35% 80% 80% 100% 75% 75% 52% ▲
5.8 90% 65% 90% 90% 60% 40% 80% 80% 100% 75% 75% 55% ▲
5.9 95% 70% 95% 95% 65% 45% 80% 80% 100% 75% 75% 58% ▲
6.0 100% 80% 100% 100% 70% 50% 80% 80% 80% 75% 75% 60% ▲
6.1 100% 80% 100% 100% 72% 55% 80% 80% 75% 75% 75% 62% ▲
6.2 100% 80% 100% 100% 75% 60% 78% 78% 70% 75% 75% 63% ▲
6.3 100% 85% 100% 100% 80% 65% 75% 75% 65% 75% 75% 65% pH OK
6.4 100% 88% 100% 100% 83% 70% 70% 70% 60% 75% 75% 68% ▼
6.5 100% 90% 100% 100% 85% 75% 65% 65% 55% 75% 75% 70% ▼
6.6 100% 90% 100% 100% 85% 76% 60% 60% 53% 75% 75% 72% ▼
6.7 100% 90% 100% 100% 85% 77% 58% 58% 50% 75% 75% 74% ▼
6.8 100% 80% 100% 100% 85% 78% 56% 56% 46% 72% 72% 76% ▼
6.9 100% 70% 100% 100% 85% 79% 53% 53% 43% 72% 72% 78% ▼
7.0 100% 65% 100% 100% 85% 80% 50% 50% 40% 70% 70% 80% ▼
alkaline
pH
 N P K S Ca Mg Fe Mn B Cu Zn Mo ▲▼pH
Here are the percentage of absorption of elements by the plant, yellow elements are in major deficiency.
See the last column whether increase or decrease the pH level.

HYDROPONIC GROWING pH CHART (aeroponics, coco, rockwool, clay)
acid
pH
 N P K S Ca Mg Fe Mn B Cu Zn Mo ▲▼pH
5.0 75% 50% 75% 75% 40% 30% 80% 80% 100% 75% 75% 50% ▲
5.1 80% 55% 80% 80% 45% 33% 80% 80% 100% 75% 75% 50% ▲
5.2 85% 60% 85% 85% 55% 35% 80% 80% 100% 75% 75% 52% ▲
5.3 90% 65% 90% 90% 60% 40% 80% 80% 100% 75% 75% 55% ▲
5.4 95% 70% 95% 95% 65% 45% 80% 80% 100% 75% 75% 58% ▲
5.5 100% 80% 100% 100% 70% 50% 80% 80% 80% 75% 75% 60% ▲
5.6 100% 80% 100% 100% 72% 55% 80% 80% 75% 75% 75% 62% ▲
5.7 100% 80% 100% 100% 75% 60% 78% 78% 70% 75% 75% 63% ▲
5.8 100% 85% 100% 100% 80% 65% 75% 75% 65% 75% 75% 65% pH OK
5.9 100% 88% 100% 100% 83% 70% 70% 70% 60% 75% 75% 68% ▼
6.0 100% 90% 100% 100% 85% 75% 65% 65% 55% 75% 75% 70% ▼
6.1 100% 90% 100% 100% 85% 76% 60% 60% 53% 75% 75% 72% ▼
6.2 100% 90% 100% 100% 85% 77% 58% 58% 50% 75% 75% 74% ▼
6.3 100% 80% 100% 100% 85% 75% 56% 56% 46% 72% 72% 76% ▼
6.4 100% 70% 100% 100% 85% 79% 53% 53% 43% 72% 72% 78% ▼
6.5 100% 65% 100% 100% 85% 80% 50% 50% 40% 70% 70% 80% ▼
6.6 100% 63% 100% 100% 85% 80% 48% 47% 38% 68% 68% 81% ▼
6.7 100% 60% 100% 100% 85% 80% 46% 45% 36% 65% 65% 80% ▼
6.8 100% 56% 100% 100% 85% 80% 44% 42% 34% 60% 60% 83% ▼
6.9 100% 53% 100% 100% 85% 80% 42% 39% 32% 55% 55% 84% ▼
7.0 100% 50% 100% 100% 85% 80% 40% 35% 0% 50% 50% 85% ▼
alkaline
pH		 N P K S Ca Mg Fe Mn B Cu Zn Mo ▲▼pH
Here are the percentage of absorption of elements by the plant, yellow elements are in major deficiency.
See the last column whether increase or decrease the pH level.