The present invention discloses a height adjustable modular heel (2) for use in a shoe, comprises a heel body (22) having a first end detachably attached to a heel base (21) that is affixed to the shoe and a second end detachably attached with a heel cap (23) to protect the heel body (22) from wear and tear, wherein the heel body (22) is formed by identical heel body pieces (22A) that are detachably attached together in a stacking manner to form a desired height for the heel (2) depending on a number of the heel body pieces (22A) stacked, and wherein the heel body pieces (22A) are interchangeable and stackable in any sequence to allow for customization of the heel height, characterised in that the heel (2), assembled by the heel base (21), the heel body (22) and the heel cap (23), forms an arc of a predetermined radius to achieve same or similar level of ergonomics at different heights.