How many cal is 180 J?
180 J = 43.021 cal
It is 43.021 cal, so saying 43 cal is fine — rounding is within 0.5%.
And how many J is 180 cal?
180 cal = 753.12 J
Formula: cal = J × 0.239006
J to cal around this value
90 J21.511cal
100 J23.901cal
110 J26.291cal
120 J28.681cal
130 J31.071cal
140 J33.461cal
150 J35.851cal
160 J38.241cal
170 J40.631cal
180 J43.021cal
190 J45.411cal
200 J47.801cal
210 J50.191cal
220 J52.581cal
230 J54.971cal
240 J57.361cal
250 J59.751cal
260 J62.141cal
270 J64.532cal
280 J66.922cal