The flame stretch along the premixed branches of a triple flame is reported here. A laminar triple flame is stabilized in a diverging test section of a splitter plate burner. The flow field is deduced from the particle image velocimetry measurement and the flame front is deduced from the normal strain gradient. The deduced flame front is in good agreement with that observed in OH PLIF images. The triple flame is convex towards the fresh gas and the flow diverges ahead of the flame. The stretch rate is highly sensitive to even mild spatial fluctuations in the tangential velocity component along the flame front. Smoothing the velocity variation along the flame front by curve-fitting the data corrects for such fluctuation. The flame speed along the flame front is observed to increase with flame stretch.