- 1). Divide the weight in metric tons by one billion, which is 1,000,000,000, to convert it to an equivalent weight in petagrams. For an example, 10 billion metric tons divided by a billion converts to 10 petagrams.
- 2). Multiply the weight in metric tons by a billionth, which is 0.000000001, to also convert to an equivalent weight in petagrams. For an example, 5.5 billion metric tons multiplied by a billionth equals 5.5 petagrams.
- 3). Convert the weight units at a website like UnitConversion.org (see Resources). Enter the number of metric tons in the given space next to the "Metric Tons" label. The conversion will appear beneath in the space next to the "Petagrams" label.
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