Eurostat said inflation, in an estimate that could be revised later, would slow to 1.2 percent after coming in at 1.8 percent in February and 1.7 percent in March in the currency region.
Prices for food, alcohol and tobacco are expected to have the highest inflation rate with gains at 2.9 percent compared with 2.7 percent in March. Energy prices are expected to drop 0.4 percent after rising 1.7 percent in March.
Core inflation, which excludes food and energy, is expected to drop to 1 percent from 1.5 percent in March. Excluding only energy prices is expected to result in an inflation rate of 1.4 percent from 1.8 percent in March.