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thanks for the heads up. I was away. Just came back. Good work Rana.. I have made some changes.. I hope that will work Cheers

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change your units to lb-ft as you know concrete density is 150 pounds per cubic feet = 150 pcf now w=mg according to physics...and g = 32.2 ft/s² so your mass will be = 150/32.2 = 4.658 lb remember to check your units....if in your case it is kip-in then weight = 150 lb/ft³ / 12³ / 1000 = 8.68E-5 kips/in³ (not just 8.68 as you mentioned in your question) similary mass = weight / gravity = 8.68e-5 / 386.4 = 2.246E-9 (because 32.2 ft/s² = 32.2x12 = 386.4 in/² as your units are kip-in) weight and and mass are not affected by compressive strength....