Minimum oral lethal doses of boric acid in humans have been estimated from accidental poisonings to be in the range of 5-20 g for adults, 3-6 g for children and <5 g for infants. Source: http://npic.orst.edu/factsheets/archive/borictech.html#acute

A minimum of 56g of salt, taken all at once, will kill you. Source: https://www.timesknowledge.in/science/about-us-humans/what-is-the-lethal-dose-of-salt-1757-2.html

So then borax is approximately 5-10x more lethal than table salt.

Minimum oral lethal doses of boric acid in humans have been estimated from accidental poisonings to be in the range of 5-20 g for adults, 3-6 g for children and <5 g for infants. Source: http://npic.orst.edu/factsheets/archive/borictech.html#acute

A tablespoon of salt weighs about 15 grams, in case you’re wondering, and between 0.75g and 3g per kilogram of body weight is the estimated lethal dose of salt. The average body weight of a healthy adult is 75kg, that means a minimum of 56g of salt or about 10 teaspoons, taken all at once, will kill you. Source: https://www.timesknowledge.in/science/about-us-humans/what-is-the-lethal-dose-of-salt-1757-2.html

So then borax is approximately 5-10x more lethal than table salt.