There are several online calculators are also available

http://boehler-welding-service.com/voestalpine/calculator/eng/https://www.twi-global.com/technical-knowledge/job-knowledge/calculating-weld-volume-and-weight-095

https://welding-calculator.lincolnelectric.com/calculator/quick

https://www.kobelco-welding.jp/education-center/abc/ABC_2004-02.html

https://tiberg.com/esab-qwpa/

https://weldinganswers.com/6-steps-to-calculating-total-weld-needed/