20% Tip on $100

To calculate a 20% tip on $100, multiply the bill amount by 0.20:

$100 × 0.20 = $20.00

Add the tip to the original bill to get the total:

$100 + $20.00 = $120.00

Quick mental math tip: Move the decimal one place left to get 10% ($10.00), then double it.

Standard tipping in the United States ranges from 15% to 25% at restaurants. Here is a general guide:

• 15% — Acceptable for adequate service
• 18% — Standard for good service
• 20% — Most common tip; standard for great service
• 25%+ — Exceptional service or fine dining

For a $100 bill, tips typically range from $15.00 (15%) to $25.00 (25%).