If the pain is associated with numbness / tingling sensation in your leg/ feet, then the pathology might be in your spine.
If not, are there any prominent veins or bluish discolouration or itching sensation felt at the end of the day, these symptoms are suggestive of varicose veins for which vascular surgery opinion is necessary.
If none of the above is there, go for hot fomentation for calves and apply diclofenac gel, and start stretching exercises.
Next Steps
Look for other associated symptoms