[wincy]

Only 38 Swiss Francs (~40USD, ~35EUR) to review this standard! So if I want to make an ISO standard instrument do I need to buy all the other notes too?

[cogwheel]

no, you just need to multiply 440 by (12th root of 2)^k, where k is the number of half-tones above (pos) or below (neg) A440

[rezonant]

only if it's equal temperament :-)

[cogwheel]

you have just the right name :)

[anticristi]

Only if you don't know how to multiply and divide frequencies by 2^(1/12).