Digit followed by % sign, no space:

**Of the 5000 people who answered the survey, 10% were French. **

**58%, 90% etc**

When calculating percentages, beware the "rose by/fell by X%" construction: an increase from 3% to 5% is a **2-percentage-point increase** or a **2-point increase**, not a 2% increase

Never use the "per thousand" symbol, ‰

0**.001** not 1‰

For smaller decimals, house style decrees scientific notation:

**1 × 10 ^{-6}** not 0.000 001

Except when comparing percentages directly:

**The company's market share fell from 0.01% to 0.000 43% **(not 4.3 × 10^{-4}% in this case - keeping the decimal format accentuates the comparison)

Tags: