The initial death toll between the two atomic bombs is less than 200,000. The long term death tolls are significantly higher, but didn't contribute to the decision to surrender.
Do not underestimate the effect that the fire bombing campaign had on Japan. The Tokyo raid death toll was higher than either initial death toll from the atomic bombs. In less than 12 months the fire bombing campaign had burned out the cores of almost every Japanese city and the USAAF was running out of targets. Once the US was able to operate out of the Marianas and had switched to fire bombing and harbor mining the B-29 is probably the most important single weapons system that hastened the end of the war. Had the atomic bombs not been dropped and the allies had invaded Japan, the B-29 would have had a major role in neutralizing Japanese defenses by delivering the US version of the Tall Boy bomb.