Ugh looks like my torque wrench only goes up to 250nm...

Is there a calculation so I can figure out how much more it would need to reach about 300nm?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k