官方的 FAQ 里有提到，
https://www.vultr.com/faq/At what rate is overage bandwidth billed?
Bandwidth utilization in excess of instance allocation is charged at $0.01 per GB in North American and Western European locations. Due to higher regional costs, Singapore and Tokyo (Japan) overage is priced at $0.025 per GB and Sydney (Australia) overage is priced at $0.05 per GB.
How are monthly bandwidth caps calculated for hourly instances?
If your plan has 1000GB allocated to it, the amount of transfer per hour for overage calculations is 1000 / 672 = 1.48GB/hour. Your pending charges will reflect the overage calculated by this formula. Note: In some cases it may be less expensive to leave your instance running than to destroy it and be assessed overage charges.
以下来自谷歌翻译：
超额费用是多少费率？
超过实例分配的带宽利用率在北美和西欧地区每 GB 收取 0.01 美元。由于区域成本较高，新加坡和东京（日本）的超额售价为每 GB 0.025 美元，悉尼（澳大利亚）的超额售价为每 GB 0.05 美元。
每小时实例的月带宽上限如何计算？
如果您的计划已分配给 1000GB ，则每小时超量计算的传输量为 1000/672 = 1.48GB /小时。您的待处理费用将反映此公式计算的超额。注意：在某些情况下，将您的实例运行而不是销毁它并且被评估超额费用可能会更便宜。