How to convert carats to grams
Multiply the value in ct by 0.2: the result is in g.
g = ct × 0.2The other way round, 1 g = 5 ct.
Where these two units are used
The carat of gemstones has been exactly 0.2 gram since 1907; it is not to be confused with the karat of gold, which is not a mass but a purity out of twenty-four. The gram is the unit of food labels and recipes, the one in which per-hundred-gram figures and postal rates are read. The jeweller quotes carats, the buyer wants to know what it weighs: five carats make exactly one gram, which makes the arithmetic immediate once you know it.
Conversion table, carats to grams
| 1 ct | 0.2 g |
| 2 ct | 0.4 g |
| 5 ct | 1 g |
| 10 ct | 2 g |
| 20 ct | 4 g |
| 50 ct | 10 g |
| 100 ct | 20 g |
| 500 ct | 100 g |
| 1,000 ct | 200 g |
Show every value
- 1 ct = 0.2 g
- 2 ct = 0.4 g
- 3 ct = 0.6 g
- 4 ct = 0.8 g
- 5 ct = 1 g
- 6 ct = 1.2 g
- 7 ct = 1.4 g
- 8 ct = 1.6 g
- 9 ct = 1.8 g
- 10 ct = 2 g
- 11 ct = 2.2 g
- 12 ct = 2.4 g
- 13 ct = 2.6 g
- 14 ct = 2.8 g
- 15 ct = 3 g
- 16 ct = 3.2 g
- 17 ct = 3.4 g
- 18 ct = 3.6 g
- 19 ct = 3.8 g
- 20 ct = 4 g
- 21 ct = 4.2 g
- 22 ct = 4.4 g
- 23 ct = 4.6 g
- 24 ct = 4.8 g
- 25 ct = 5 g
- 26 ct = 5.2 g
- 27 ct = 5.4 g
- 28 ct = 5.6 g
- 29 ct = 5.8 g
- 30 ct = 6 g
- 31 ct = 6.2 g
- 32 ct = 6.4 g
- 33 ct = 6.6 g
- 34 ct = 6.8 g
- 35 ct = 7 g
- 36 ct = 7.2 g
- 37 ct = 7.4 g
- 38 ct = 7.6 g
- 39 ct = 7.8 g
- 40 ct = 8 g
- 41 ct = 8.2 g
- 42 ct = 8.4 g
- 43 ct = 8.6 g
- 44 ct = 8.8 g
- 45 ct = 9 g
- 46 ct = 9.2 g
- 47 ct = 9.4 g
- 48 ct = 9.6 g
- 49 ct = 9.8 g
- 50 ct = 10 g
- 51 ct = 10.2 g
- 52 ct = 10.4 g
- 53 ct = 10.6 g
- 54 ct = 10.8 g
- 55 ct = 11 g
- 56 ct = 11.2 g
- 57 ct = 11.4 g
- 58 ct = 11.6 g
- 59 ct = 11.8 g
- 60 ct = 12 g
- 61 ct = 12.2 g
- 62 ct = 12.4 g
- 63 ct = 12.6 g
- 64 ct = 12.8 g
- 65 ct = 13 g
- 66 ct = 13.2 g
- 67 ct = 13.4 g
- 68 ct = 13.6 g
- 69 ct = 13.8 g
- 70 ct = 14 g
- 71 ct = 14.2 g
- 72 ct = 14.4 g
- 73 ct = 14.6 g
- 74 ct = 14.8 g
- 75 ct = 15 g
- 76 ct = 15.2 g
- 77 ct = 15.4 g
- 78 ct = 15.6 g
- 79 ct = 15.8 g
- 80 ct = 16 g
- 81 ct = 16.2 g
- 82 ct = 16.4 g
- 83 ct = 16.6 g
- 84 ct = 16.8 g
- 85 ct = 17 g
- 86 ct = 17.2 g
- 87 ct = 17.4 g
- 88 ct = 17.6 g
- 89 ct = 17.8 g
- 90 ct = 18 g
- 91 ct = 18.2 g
- 92 ct = 18.4 g
- 93 ct = 18.6 g
- 94 ct = 18.8 g
- 95 ct = 19 g
- 96 ct = 19.2 g
- 97 ct = 19.4 g
- 98 ct = 19.6 g
- 99 ct = 19.8 g
- 100 ct = 20 g
- 101 ct = 20.2 g
- 102 ct = 20.4 g
- 103 ct = 20.6 g
- 104 ct = 20.8 g
- 105 ct = 21 g
- 106 ct = 21.2 g
- 107 ct = 21.4 g
- 108 ct = 21.6 g
- 109 ct = 21.8 g
- 110 ct = 22 g
- 111 ct = 22.2 g
- 112 ct = 22.4 g
- 113 ct = 22.6 g
- 114 ct = 22.8 g
- 115 ct = 23 g
- 116 ct = 23.2 g
- 117 ct = 23.4 g
- 118 ct = 23.6 g
- 119 ct = 23.8 g
- 120 ct = 24 g
- 121 ct = 24.2 g
- 122 ct = 24.4 g
- 123 ct = 24.6 g
- 124 ct = 24.8 g
- 125 ct = 25 g
- 126 ct = 25.2 g
- 127 ct = 25.4 g
- 128 ct = 25.6 g
- 129 ct = 25.8 g
- 130 ct = 26 g
- 131 ct = 26.2 g
- 132 ct = 26.4 g
- 133 ct = 26.6 g
- 134 ct = 26.8 g
- 135 ct = 27 g
- 136 ct = 27.2 g
- 137 ct = 27.4 g
- 138 ct = 27.6 g
- 139 ct = 27.8 g
- 140 ct = 28 g
- 141 ct = 28.2 g
- 142 ct = 28.4 g
- 143 ct = 28.6 g
- 144 ct = 28.8 g
- 145 ct = 29 g
- 146 ct = 29.2 g
- 147 ct = 29.4 g
- 148 ct = 29.6 g
- 149 ct = 29.8 g
- 150 ct = 30 g
- 151 ct = 30.2 g
- 152 ct = 30.4 g
- 153 ct = 30.6 g
- 154 ct = 30.8 g
- 155 ct = 31 g
- 156 ct = 31.2 g
- 157 ct = 31.4 g
- 158 ct = 31.6 g
- 159 ct = 31.8 g
- 160 ct = 32 g
- 161 ct = 32.2 g
- 162 ct = 32.4 g
- 163 ct = 32.6 g
- 164 ct = 32.8 g
- 165 ct = 33 g
- 166 ct = 33.2 g
- 167 ct = 33.4 g
- 168 ct = 33.6 g
- 169 ct = 33.8 g
- 170 ct = 34 g
- 171 ct = 34.2 g
- 172 ct = 34.4 g
- 173 ct = 34.6 g
- 174 ct = 34.8 g
- 175 ct = 35 g
- 176 ct = 35.2 g
- 177 ct = 35.4 g
- 178 ct = 35.6 g
- 179 ct = 35.8 g
- 180 ct = 36 g
- 181 ct = 36.2 g
- 182 ct = 36.4 g
- 183 ct = 36.6 g
- 184 ct = 36.8 g
- 185 ct = 37 g
- 186 ct = 37.2 g
- 187 ct = 37.4 g
- 188 ct = 37.6 g
- 189 ct = 37.8 g
- 190 ct = 38 g
- 191 ct = 38.2 g
- 192 ct = 38.4 g
- 193 ct = 38.6 g
- 194 ct = 38.8 g
- 195 ct = 39 g
- 196 ct = 39.2 g
- 197 ct = 39.4 g
- 198 ct = 39.6 g
- 199 ct = 39.8 g
- 200 ct = 40 g
- 205 ct = 41 g
- 210 ct = 42 g
- 215 ct = 43 g
- 220 ct = 44 g
- 225 ct = 45 g
- 230 ct = 46 g
- 235 ct = 47 g
- 240 ct = 48 g
- 245 ct = 49 g
- 250 ct = 50 g
- 255 ct = 51 g
- 260 ct = 52 g
- 265 ct = 53 g
- 270 ct = 54 g
- 275 ct = 55 g
- 280 ct = 56 g
- 285 ct = 57 g
- 290 ct = 58 g
- 295 ct = 59 g
- 300 ct = 60 g
- 305 ct = 61 g
- 310 ct = 62 g
- 315 ct = 63 g
- 320 ct = 64 g
- 325 ct = 65 g
- 330 ct = 66 g
- 335 ct = 67 g
- 340 ct = 68 g
- 345 ct = 69 g
- 350 ct = 70 g
- 355 ct = 71 g
- 360 ct = 72 g
- 365 ct = 73 g
- 370 ct = 74 g
- 375 ct = 75 g
- 380 ct = 76 g
- 385 ct = 77 g
- 390 ct = 78 g
- 395 ct = 79 g
- 400 ct = 80 g
- 405 ct = 81 g
- 410 ct = 82 g
- 415 ct = 83 g
- 420 ct = 84 g
- 425 ct = 85 g
- 430 ct = 86 g
- 435 ct = 87 g
- 440 ct = 88 g
- 445 ct = 89 g
- 450 ct = 90 g
- 455 ct = 91 g
- 460 ct = 92 g
- 465 ct = 93 g
- 470 ct = 94 g
- 475 ct = 95 g
- 480 ct = 96 g
- 485 ct = 97 g
- 490 ct = 98 g
- 495 ct = 99 g
- 500 ct = 100 g
- 510 ct = 102 g
- 520 ct = 104 g
- 530 ct = 106 g
- 540 ct = 108 g
- 550 ct = 110 g
- 560 ct = 112 g
- 570 ct = 114 g
- 580 ct = 116 g
- 590 ct = 118 g
- 600 ct = 120 g
- 610 ct = 122 g
- 620 ct = 124 g
- 630 ct = 126 g
- 640 ct = 128 g
- 650 ct = 130 g
- 660 ct = 132 g
- 670 ct = 134 g
- 680 ct = 136 g
- 690 ct = 138 g
- 700 ct = 140 g
- 710 ct = 142 g
- 720 ct = 144 g
- 730 ct = 146 g
- 740 ct = 148 g
- 750 ct = 150 g
- 760 ct = 152 g
- 770 ct = 154 g
- 780 ct = 156 g
- 790 ct = 158 g
- 800 ct = 160 g
- 810 ct = 162 g
- 820 ct = 164 g
- 830 ct = 166 g
- 840 ct = 168 g
- 850 ct = 170 g
- 860 ct = 172 g
- 870 ct = 174 g
- 880 ct = 176 g
- 890 ct = 178 g
- 900 ct = 180 g
- 910 ct = 182 g
- 920 ct = 184 g
- 930 ct = 186 g
- 940 ct = 188 g
- 950 ct = 190 g
- 960 ct = 192 g
- 970 ct = 194 g
- 980 ct = 196 g
- 990 ct = 198 g
- 1,000 ct = 200 g
- 1,025 ct = 205 g
- 1,050 ct = 210 g
- 1,075 ct = 215 g
- 1,100 ct = 220 g
- 1,125 ct = 225 g
- 1,150 ct = 230 g
- 1,175 ct = 235 g
- 1,200 ct = 240 g
- 1,225 ct = 245 g
- 1,250 ct = 250 g
- 1,275 ct = 255 g
- 1,300 ct = 260 g
- 1,325 ct = 265 g
- 1,350 ct = 270 g
- 1,375 ct = 275 g
- 1,400 ct = 280 g
- 1,425 ct = 285 g
- 1,450 ct = 290 g
- 1,475 ct = 295 g
- 1,500 ct = 300 g
- 1,525 ct = 305 g
- 1,550 ct = 310 g
- 1,575 ct = 315 g
- 1,600 ct = 320 g
- 1,625 ct = 325 g
- 1,650 ct = 330 g
- 1,675 ct = 335 g
- 1,700 ct = 340 g
- 1,725 ct = 345 g
- 1,750 ct = 350 g
- 1,775 ct = 355 g
- 1,800 ct = 360 g
- 1,825 ct = 365 g
- 1,850 ct = 370 g
- 1,875 ct = 375 g
- 1,900 ct = 380 g
- 1,925 ct = 385 g
- 1,950 ct = 390 g
- 1,975 ct = 395 g
- 2,000 ct = 400 g
- 2,050 ct = 410 g
- 2,100 ct = 420 g
- 2,150 ct = 430 g
- 2,200 ct = 440 g
- 2,250 ct = 450 g
- 2,300 ct = 460 g
- 2,350 ct = 470 g
- 2,400 ct = 480 g
- 2,450 ct = 490 g
- 2,500 ct = 500 g
- 2,550 ct = 510 g
- 2,600 ct = 520 g
- 2,650 ct = 530 g
- 2,700 ct = 540 g
- 2,750 ct = 550 g
- 2,800 ct = 560 g
- 2,850 ct = 570 g
- 2,900 ct = 580 g
- 2,950 ct = 590 g
- 3,000 ct = 600 g
- 3,050 ct = 610 g
- 3,100 ct = 620 g
- 3,150 ct = 630 g
- 3,200 ct = 640 g
- 3,250 ct = 650 g
- 3,300 ct = 660 g
- 3,350 ct = 670 g
- 3,400 ct = 680 g
- 3,450 ct = 690 g
- 3,500 ct = 700 g
- 3,550 ct = 710 g
- 3,600 ct = 720 g
- 3,650 ct = 730 g
- 3,700 ct = 740 g
- 3,750 ct = 750 g
- 3,800 ct = 760 g
- 3,850 ct = 770 g
- 3,900 ct = 780 g
- 3,950 ct = 790 g
- 4,000 ct = 800 g
- 4,050 ct = 810 g
- 4,100 ct = 820 g
- 4,150 ct = 830 g
- 4,200 ct = 840 g
- 4,250 ct = 850 g
- 4,300 ct = 860 g
- 4,350 ct = 870 g
- 4,400 ct = 880 g
- 4,450 ct = 890 g
- 4,500 ct = 900 g
- 4,550 ct = 910 g
- 4,600 ct = 920 g
- 4,650 ct = 930 g
- 4,700 ct = 940 g
- 4,750 ct = 950 g
- 4,800 ct = 960 g
- 4,850 ct = 970 g
- 4,900 ct = 980 g
- 4,950 ct = 990 g
- 5,000 ct = 1,000 g
- 5,100 ct = 1,020 g
- 5,200 ct = 1,040 g
- 5,300 ct = 1,060 g
- 5,400 ct = 1,080 g
- 5,500 ct = 1,100 g
- 5,600 ct = 1,120 g
- 5,700 ct = 1,140 g
- 5,800 ct = 1,160 g
- 5,900 ct = 1,180 g
- 6,000 ct = 1,200 g
- 6,100 ct = 1,220 g
- 6,200 ct = 1,240 g
- 6,300 ct = 1,260 g
- 6,400 ct = 1,280 g
- 6,500 ct = 1,300 g
- 6,600 ct = 1,320 g
- 6,700 ct = 1,340 g
- 6,800 ct = 1,360 g
- 6,900 ct = 1,380 g
- 7,000 ct = 1,400 g
- 7,100 ct = 1,420 g
- 7,200 ct = 1,440 g
- 7,300 ct = 1,460 g
- 7,400 ct = 1,480 g
- 7,500 ct = 1,500 g
- 7,600 ct = 1,520 g
- 7,700 ct = 1,540 g
- 7,800 ct = 1,560 g
- 7,900 ct = 1,580 g
- 8,000 ct = 1,600 g
- 8,100 ct = 1,620 g
- 8,200 ct = 1,640 g
- 8,300 ct = 1,660 g
- 8,400 ct = 1,680 g
- 8,500 ct = 1,700 g
- 8,600 ct = 1,720 g
- 8,700 ct = 1,740 g
- 8,800 ct = 1,760 g
- 8,900 ct = 1,780 g
- 9,000 ct = 1,800 g
- 9,100 ct = 1,820 g
- 9,200 ct = 1,840 g
- 9,300 ct = 1,860 g
- 9,400 ct = 1,880 g
- 9,500 ct = 1,900 g
- 9,600 ct = 1,920 g
- 9,700 ct = 1,940 g
- 9,800 ct = 1,960 g
- 9,900 ct = 1,980 g
- 10,000 ct = 2,000 g
Factors from the SI brochure (BIPM) and from NIST Special Publication 811. Methodology & sources.