Mackerel Weights. Available in 0.25lb weights. Discounts available on bulk purchase in any combination of sizes. Approximate weight conversions are as follows:->0.25lbs = 113 grams 0.50lbs = 226 grams 1.00lbs = 454 grams 1.50lbs = 680 grams 2.00lbs = 900 grams 3.00lbs = 1360 grams 4.00lbs = 1814 grams