Convert standard atmospheres to kilopascals

One standard atmosphere is 101.325 kilopascals. To convert any amount, multiply by 101.325. Going the other way, one kilopascal is 0.00986923267 standard atmospheres.

Multiply the standard atmosphere figure by 101.325. So kPa = atm × 101.325. For a quick mental estimate, multiplying by about 101 gets you within a percent or so, which is close enough for most everyday purposes.

One standard atmosphere is sea-level air pressure by definition. One standard atmosphere is defined as exactly 101,325 pascals. It is a reference value rather than a measurement of the actual air pressure today.

One kilopascal is a car tyre runs about 220 kPa. The kilopascal is the SI-derived unit used on tyre placards in Canada, Australia and much of Europe, and in weather reporting.

Yes. Since the 1959 international yard and pound agreement, the imperial and metric systems are related by exact definitions rather than measurements — the inch is exactly 25.4 mm and the pound exactly 0.45359237 kg. Everything derived from those, including this conversion, is therefore exact. Round at the end rather than partway through, since rounding atm before converting introduces an error the conversion then multiplies.