Fresh water in frozen glaciers and ice caps makes up about 66% of the total amount of fresh water on Earth.
3% of Earth's water is fresh water and 97% of Earth's water that is salt water.
Fresh water in frozen glaciers and ice caps makes up 2% of all water on Earth and 1% of Earth's water is usable in liquid form.
2% ÷ 3% = 0,66.