The US-led coalition must end its denial over the death toll, Amnesty International and Airwars say.
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Raqqa
RAF crews have been talking to the BBC's Jonathan Beale about the challenges they face in avoiding civilian casualties in Iraq and Syria.
But the bombing raids have only killed one civilian since 2014, the Ministry of Defence says.
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Jonathan Beale
Defence correspondent, BBC News
A year after its recapture from Islamic State forces, the Syrian city remains largely ruined.
Read moreReturn to Raqqa
There's no place like home, but what if that home is Raqqa, northern Syria? The city became capital of so-called Islamic State, and was left in ruins after the military campaign to retake it. But despite the devastation many families are now coming home, including Um Louay, who fled with her husband and children in 2013. Nader Ibrahim of BBC Arabic followed her story. Image: Um Louay Credit: BBC
Um Louay and her nine children say returning to their partially-destroyed house is better than living in a camp.
Amnesty claims hundreds of civilians were killed in Raqqa by US-led coalition air strikes in IS war.
Read moreHamoudi was kidnapped, tortured... then escaped.
How does a man go from peaceful protester to trained Islamic State assassin? This is Khaled's story.
Read moreAmer hasn't heard from his brother Mohamed since he was arrested and put in an IS jail.