Leviticus 27:15-25

15 aAnd if the donor wishes to redeem his house, he shall add a bfifth to the valuation price, and it shall be his.

16“If a man dedicates to the Lord part of the land that is his possession, then the valuation shall be in proportion to its seed. A homer
A  homer was about 6 bushels or 220 liters
of barley seed shall be valued at fifty shekels of silver.
17If he dedicates his field from the year of jubilee, the valuation shall stand, 18but if he dedicates his field after the jubilee, then the priest shall dcalculate the price according to the years that remain until the year of jubilee, and a deduction shall be made from the valuation. 19 eAnd if he who dedicates the field wishes to redeem it, then he shall add a ffifth to its valuation price, and it shall remain his. 20But if he does not wish to redeem the field, or if he has sold the field to another man, it shall not be redeemed anymore. 21But the field, gwhen it is released in the jubilee, shall be a holy gift to the Lord, like a field that has been hdevoted. The priest shall be in ipossession of it. 22If he dedicates to the Lord a field that he has bought, jwhich is not a part of his possession, 23 kthen the priest shall calculate the amount of the valuation for it up to the year of jubilee, and the man shall give the valuation on that day as a holy gift to the Lord. 24 lIn the year of jubilee the field shall return to him from whom it was bought, to whom the land belongs as a possession. 25Every valuation shall be according to mthe shekel of the sanctuary: ntwenty gerahs
A  gerah was about 1/50 ounce or 0.6 gram
shall make a shekel.

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