3 ms·
> C is roughly (F - 30)/2, not too bad. A few months ago, I was concerned about the inaccuracy of this rough conversion. It's actually accurate to within ±3°F
by BrandonM 12y ago
> C is roughly (F - 30)/2, not too bad.
A few months ago, I was concerned about the inaccuracy of this rough conversion. It's actually accurate to within ±3°F for all temperatures -5°C to 25°C (23°F to 77°F). If you're OK with ±5°F, it works for -15°C to 35°C (5°F to 95°F).
So the conversion works pretty well for the vast majority of environmental conditions. C = (F - 30) / 2 and F = C * 2 + 30 are great approximations.