Red-hot inflation is costing the average US household an additional $296.45 in expenses as surging food and fuel costs stretch budgets, according to calculations provided to The Post. Ryan Sweet, a senior economist at Moody’s Analytics, crunched the numbers after the latest Labor Department data showed consumer prices jumped 7.9% in February. He arrived at the figure by comparing average US household spending last month to what would have been spent in 2018 and 2019, when inflation paced at 2.1%. “Unfortunately, things will get worse before they get better. Higher energy prices in March are going to boost the [Consumer Price Index],” Sweet told The Post.