Global deaths linked to the new strain of coronavirus have passed 200,000.
Confirmed cases of the virus are expected to hit three million in coming days.
More than half of the fatalities have been reported by the United States, Spain and Italy.
The UK's hospital death toll passed 20,000 on Saturday, but the true total could be double that figure, according to experts.
The first death linked to the disease was reported on January 10 in Wuhan, China.
It took 91 days for the death toll to pass 100,000 and a further 16 days to reach 200,000, according to a Reuters tally of official reports from governments.
By comparison, there are an estimated 400,000 deaths annually from malaria, one of the world's most deadly infectious diseases.
The UK's coronavirus hospital death toll has passed 20,000 - a milestones experts had earlier said would be a "good result" - after the highest single-day total in five days.
The Government has said the UK has reached its peak but the lockdown must remain in place to prevent a new wave of Covid-19.
The Department of Health confirmed 813 new deaths on Saturday, taking the toll to 20,319, shortly before the global total passed 200,000.
Speaking at the daily Downing Street briefing, Professor Stephen Powis, of NHS England, called it a "sad day" as he warned: "This is something we are going to have to continue working our way through over the months ahead."
Urging people to stay at home during the UK's fifth weekend under lockdown, Home Secretary Priti Patel said she understands Britons are frustrated "but we are not out of danger yet" and it is too soon to lift the restrictions.
Amid a warning that the lockdown could be tightened if people continue to flout the rules, the Government is said to be looking at eventually allowing people to meet small "bubbles" of their friends and family when it is safe to do so.
The United States had reported more than 52,400 deaths as of Saturday morning, while Italy, Spain and France have reported between 22,000-26,000 fatalities each.
Of the top 20 most severely affected countries, Belgium has reported the highest number of fatalities per capita, with six deaths per 10,000 people, compared to 4.9 in Spain and 1.6 in the United States.
Around eight per cent of all cases reported in the United States have been fatal, while more than 10 per cent of cases reported in Spain and Italy have resulted in deaths.
However those rates would be considerably lower if the infection totals included the many cases of the illness that go unreported - since not everyone with symptoms is tested.
Asia and Latin America have each reported more than 7,000 deaths, while the Middle East has reported upwards of 8,800.
The current toll in Africa is around 1,350.
The global death toll has continued to grow at a rate of three to four per cent each day over the past 10 days, though that rate has slowed since the beginning of the month.
The true number of fatalities is expected to be higher as many countries have not included deaths recorded in nursing homes and other locations outside hospitals.
