Here are two charts (0-6 pounds and 7-13 pounds) to help you simply convert your baby’s weight in pounds and ounces to grams — or vice versa!
When do people measure in grams?
In the US — since American is one of the few metric system holdouts — a healthcare provider may tell you your baby’s weight in grams — such as after birth, during an ultrasound, or at baby checkups and other doctor visits.
Pounds are in across the top, while ounces in run down the side — and grams can be calculated by finding the intersection of the ounces and pounds.
0-6 pounds (0 to 3147 grams)
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | |
| 0 | 0 | 454 | 907 | 1361 | 1814 | 2268 | 2722 |
| 1 | 28 | 482 | 936 | 1389 | 1843 | 2296 | 2750 |
| 2 | 57 | 510 | 964 | 1417 | 1871 | 2325 | 2778 |
| 3 | 85 | 539 | 992 | 1446 | 1899 | 2353 | 2807 |
| 4 | 113 | 567 | 1021 | 1474 | 1928 | 2381 | 2835 |
| 5 | 142 | 595 | 1049 | 1503 | 1956 | 2410 | 2863 |
| 6 | 170 | 624 | 1077 | 1531 | 1984 | 2438 | 2892 |
| 7 | 198 | 652 | 1106 | 1559 | 2013 | 2466 | 2920 |
| 8 | 227 | 680 | 1134 | 1588 | 2041 | 2495 | 2949 |
| 9 | 255 | 709 | 1162 | 1616 | 2070 | 2523 | 2977 |
| 10 | 284 | 737 | 1191 | 1644 | 2098 | 2551 | 3005 |
| 11 | 312 | 765 | 1219 | 1673 | 2126 | 2580 | 3034 |
| 12 | 340 | 794 | 1247 | 1701 | 2155 | 2608 | 3062 |
| 13 | 369 | 822 | 1276 | 1729 | 2183 | 2637 | 3091 |
| 14 | 397 | 850 | 1304 | 1758 | 2211 | 2665 | 3119 |
| 15 | 425 | 879 | 1332 | 1786 | 2240 | 2693 | 3147 |
7-14 pounds (3175 to 6322 grams)
| 7 | 8 | 9 | 10 | 11 | 12 | 13 | |
| 0 | 3175 | 3629 | 4082 | 4536 | 4990 | 5443 | 5897 |
| 1 | 3203 | 3657 | 4111 | 4564 | 5018 | 5471 | 5925 |
| 2 | 3232 | 3685 | 4139 | 4593 | 5046 | 5500 | 5953 |
| 3 | 3260 | 3714 | 4167 | 4621 | 5075 | 5528 | 5982 |
| 4 | 3289 | 3742 | 4196 | 4649 | 5103 | 5557 | 6010 |
| 5 | 3317 | 3770 | 4224 | 4678 | 5131 | 5585 | 6038 |
| 6 | 3345 | 3799 | 4252 | 4706 | 5160 | 5613 | 6067 |
| 7 | 3374 | 3827 | 4281 | 4734 | 5188 | 5642 | 6095 |
| 8 | 3402 | 3856 | 4309 | 4763 | 5216 | 5670 | 6123 |
| 9 | 3430 | 3884 | 4337 | 4791 | 5245 | 5698 | 6152 |
| 10 | 3459 | 3912 | 4366 | 4819 | 5273 | 5727 | 6180 |
| 11 | 3487 | 3941 | 4394 | 4848 | 5301 | 5755 | 6209 |
| 12 | 3515 | 3969 | 4423 | 4876 | 5330 | 5783 | 6237 |
| 13 | 3544 | 3997 | 4451 | 4904 | 5358 | 5812 | 6265 |
| 14 | 3572 | 4026 | 4479 | 4933 | 5386 | 5840 | 6294 |
| 15 | 3600 | 4054 | 4508 | 4961 | 5415 | 5868 | 6322 |
