Work out iso equivalence instantly with clear inputs, formula shown and shareable results.
ISO doubles per stop, so the new value is the base times two to the power of the stops; shot noise scales with the square root of the signal, so it rises by half as many stops. Each ISO stop above base typically costs about a stop of dynamic range, which is why highlight recovery collapses at high ISO even when noise looks acceptable.
ISO change
new ISO = base ISO x 2 ^ stops
Noise
relative shot noise = 2 ^ (stops / 2)
new ISO = base ISO x 2 ^ stops. ISO doubles per stop, so the new value is the base times two to the power of the stops; shot noise scales with the square root of the signal, so it rises by half as many stops.
Each ISO stop above base typically costs about a stop of dynamic range, which is why highlight recovery collapses at high ISO even when noise looks acceptable.
Enter starting iso, stops to push. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.