数以 + Number + 计 + 的 + Noun
The word 计 (jì) can be used to express a large, estimated count of something. It often appears in the structure 数以…计, meaning "numbering in the…," to convey that a quantity reaches into the hundreds, thousands, or millions. This pattern is common in formal or news-style Chinese.
每年来这里旅游的人数以万计。
Měi nián lái zhèlǐ lǚyóu de rén shù yǐ wàn jì.
The number of tourists who come here every year is in the tens of thousands.
公司收到的投诉数以百计,客服忙不过来。
Gōngsī shōudào de tóusù shù yǐ bǎi jì, kèfú máng bù guòlái.
The company received hundreds of complaints, and customer service is overwhelmed.
受灾群众数以千计,救援工作刻不容缓。
Shòuzāi qúnzhòng shù yǐ qiān jì, jiùyuán gōngzuò kèbùrónghuǎn.
The number of disaster victims is in the thousands; rescue work is extremely urgent.