中杯355ml，大杯473ml，为什么咖啡容量都不是整数？|milk|ml|中杯|古坑咖啡|奶茶|整数

早八人的续命咖啡、下午茶的治愈奶茶，早已成为都市生活的标配。

但你是否曾在点单时停下脚步：为什么咖啡杯型容量总带着零头——中杯355ml、大杯473ml、超大杯592ml，而很多奶茶却用整数标注？

这看似不起眼的数字差异，其实藏着行业传统、消费心理与品牌策略的多重密码。

Coffee and milk tea brands use different approaches to labeling cup sizes. Coffee shops often list precise volumes such as 355 ml or 473 ml, a practice rooted in Western measurement systems and long-standing industry conventions.

Milk tea brands, by contrast, tend to use rounded numbers that are easier to understand and better match their casual, consumer-friendly image.

图源：不同品牌咖啡小程序页面截图

咖啡的“零头容量”，根源要追溯到全球咖啡行业早期，星巴克、Tims等品牌，最初设计杯型时，使用的是当地通用的“盎司（ounce）”作为计量单位。

在英制单位体系中，12盎司（小杯）、16盎司（中杯）、20盎司（大杯）是经典规格，这些品牌进入使用公制单位的中国市场，则换算成毫升，355ml（12oz≈354.88ml），473ml（16oz≈473.18ml），592ml（20oz≈591.47ml）这些带着零头的数字。

This practice dates back to the early global coffee industry. International chains such as Starbucks and Tim Hortons originally used ounce-based cup sizes, which were later converted into metric units as they expanded into markets such as China, resulting in today's irregular milliliter figures.

国内咖啡品牌如瑞幸、库迪，为了贴合行业惯例、传递专业感，也沿用了这一换算逻辑，于是355ml、473ml成为咖啡圈的“通用密码”。

Chinese brands including Luckin Coffee and Cotti Coffee have largely followed this convention, adopting their measurements to the industry norm to signal professionalism and alignment with international standards.

图源：星巴克官网

更巧妙的是，这些非整数的精确数字，还藏着消费心理的小技巧。

心理学中的“锚定效应（anchoring effect）”告诉我们，精确数字会让消费者潜意识里认为这是经过严格测量的结果，比整数更具真实性和可信度——355ml的咖啡会让人觉得“分量实打实”，而不是像模糊的“300多ml”那样可能存在“缺斤少两”的疑虑。

同时，咖啡作为强调专业性的饮品，从“IIAC金奖咖啡豆”到精确的容量标注，每一个细节都在强化“专业”标签，而精确数字恰好成为这种专业感的具象表达。

The preference for precise numbers also reflects consumer psychology. Exact figures often appear more deliberate and trustworthy, reinforcing coffee's image as a professional, expertise-driven product.

反观奶茶，从诞生之初就贴合国人的认知习惯。整数容量简单直观、容易记忆，500ml、650ml这样的数字，能让消费者快速感知杯型大小，点单时无需额外换算，决策更高效。

Milk tea follows a different logic: rooted in everyday consumption, it favors rounded numbers such as 500 ml or 650 ml, which are easier to read, remember and quickly grasp.