1.
to add up to sth; to make sth as a total :
His earnings are said to amount to £300 000 per annum.
They gave me some help in the beginning but it did not amount to much (= they did not give me much help) .
2.
to be equal to or the same as sth :
Her answer amounted to a complete refusal.
Their actions amount to a breach of contract.
It'll cost a lot—well, take a lot of time, but it amounts to the same thing .