Background Knee pain is one of the common causes of chronic pain mainly in the older adults.Chronic knee pain (CKP) is commonly due to arthritic changes (osteoarthritis). Chronic knee pain is a common and major health problem in ageing population. Knee pain is associated with high levels of disability. So early detection and treatment of pain related functional limitation is likely to have major influence on healthy ageing. The general objective of this study was to quantify the level of pain and physical function in patient with CKP. Methods Preliminary screening of population with chronic knee pain was taken and cross sectional descriptive study was done. Questionnaire with inclusion criteria was fulfilled with administration of Nepali version of Numerical Pain Rating Scale and Nepali version of Patient Specific Functional Scale on interview as well as self-report basis and the data was managed by SPSS version 23. Results 75.6% of female with chronic knee pain was found with the average pain level found to be 5 in N-NPRS scale.Among them 80.8% of chronic knee pain was due to knee osteoarthritis. Sitting function was found to be affected in 82.1% of population with mean Nepali version of Patient specific functional Scale score of 2. Similarly 80.8% reported going downstairs to be difficult due to knee pain with N-PSFS score of 2. Conclusion Pain and functional disability are the principle findings in patient with chronic knee pain for which they seek medical treatment .So the treatments should target on functional task with effective strategy. addressing disability. Focus on function is important for the development of optimal rehabilitation programs in patients with chronic knee pain.