20% Tip on $45

To calculate a 20% tip on $45, multiply the bill amount by 0.20:

$45 × 0.20 = $9.00

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

$45 + $9.00 = $54.00

Quick mental math tip: Move the decimal one place left to get 10% ($4.50), 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 $45 bill, tips typically range from $6.75 (15%) to $11.25 (25%).