As both direct and embodied carbon emissions of data centers is expected to increase in coming years, estimating data center carbon footprints has become essential to understand and address the sustainability challenges. Due to the lack of publicly available data regarding data center operations and infrastructure, there is a need for tools that can provide carbon emission estimations with a minimal amount of data. To address this challenge, we present our open-source tool,CarbonMeter, which allows users to quickly generate carbon footprint estimates for a given data center, using only data center area and data center power capacity information.CarbonMeterallows users to easily adjust parameters that affect carbon emissions and provides a breakdown of operational and embodied footprint. Furthermore,CarbonMeterenables swift evaluation of workload migration strategies to optimize electricity costs, carbon emissions and renewable curtailment by using real-time signals in the Nordic region. We evaluate the benefits of workload migration decisions byCarbonMeteron multiple case studies encompassing data centers located in Norway, Denmark, and Germany. Our results show 6% to 21% electricity cost reductions, while reducing the carbon emissions up to 49%.