Robots will handle 52% of current work tasks by 2025, almost twice as many as now, a World Economic Forum study has said.
The sharp increase could also see a net gain in "new roles" for humans, who will have to revamp skills to keep pace with the "seismic shift" in how we work with machines and computer programmes, the forum estimated.
"By 2025 more than half of all current workplace tasks will be performed by machines as opposed to 29% today," a statement by the Swiss non-profit organisation said.
Simultaneously, rapid changes in machines and algorithms, or computer processes that are designed to solve problems, "could create 133 million new roles in place of 75 million that will be displaced between now and 2022," the group forecast.
Based near Geneva, the WEF is known for the annual gathering of wealthy individuals, politicians and business leaders that it organises in Davos, Switzerland.
Its report, The Future of Jobs 2018, foresees robots swiftly replacing humans in the accounting, client management, industrial, postal and secretarial sectors.
Jobs that require "human skills" such as sales, marketing and customer service should see demand increase meanwhile, along with e-commerce and social media.
A major challenge will be to retrain workers, who will themselves be pressed to update skills especially in the areas of "creativity, critical thinking and persuasion", the study found.
It surveyed personnel directors and senior executives from a broad range of companies around the world that account for 70% of global output.
Between now and 2022, they believe the aviation, travel and tourism sectors in particular will have to retrain workers, and identified an overall trend towards lifelong learning and adaptation.
Governments were also advised, meanwhile, to prepare safety nets for workers and communities threatened by what the WEF concluded would be "a significant shift" in the quality and permanency of the new jobs.