1. What version of the calculator are you using?The figures appear to be incorrect for the APF UK EI starter kit. Manufacturer instructions state a ratio of 4-1-6 teaspoons of KNO3, KH2PO4, MGSO4 respectively. Roughly 40g-5g-15g.
This option on the calculator computes:
19.02g KNO3 (roughly 4 teaspoons)
5.02 gKH2PO4 (roughly 1 teaspoon)
57.46g for MGSO4 - which is more like 12 teaspoons.
2. Which calculator are you using? (target, DIY, remin?)
3. Please post the dosing regime you used.