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Compound Interest Calculator

Calculate optimal savings growth with our high-precision compound interest calculator. Factor in monthly contributions, inflation, and tax drag to see your true real rate of return.

Growth Settings
Adjust your savings parameters
Total Principal
$29,000
Total Interest
+$10,421
Final Balance
$39,421
Growth Projection
Visualizing your wealth accumulation in US Average

Calculate "Real" Growth by City

Interest isn't just about the rate—it's about what you keep. Select your city to see how State Taxes and Local Inflation impact your actual bottom line.

New York, NY
State Tax Type:Progressive
Est. Effective Rate:5.5%
Boston, MA
State Tax Type:Flat
Est. Effective Rate:5%
Philadelphia, PA
State Tax Type:Flat
Est. Effective Rate:3.07%
Washington, DC
State Tax Type:Progressive
Est. Effective Rate:6%
Miami, FL
State Tax Type:None
Est. Effective Rate:0%
Atlanta, GA
State Tax Type:Flat
Est. Effective Rate:5.49%
Charlotte, NC
State Tax Type:Flat
Est. Effective Rate:4.5%
Nashville, TN
State Tax Type:None
Est. Effective Rate:0%
Jacksonville, FL
State Tax Type:None
Est. Effective Rate:0%
Chicago, IL
State Tax Type:Flat
Est. Effective Rate:4.95%
Detroit, MI
State Tax Type:Flat
Est. Effective Rate:4.25%
Columbus, OH
State Tax Type:Progressive
Est. Effective Rate:2.8%
Indianapolis, IN
State Tax Type:Flat
Est. Effective Rate:3.05%
Austin, TX
State Tax Type:None
Est. Effective Rate:0%
Houston, TX
State Tax Type:None
Est. Effective Rate:0%
Dallas, TX
State Tax Type:None
Est. Effective Rate:0%
San Antonio, TX
State Tax Type:None
Est. Effective Rate:0%
Phoenix, AZ
State Tax Type:Flat
Est. Effective Rate:2.5%
Los Angeles, CA
State Tax Type:Progressive
Est. Effective Rate:8%
San Francisco, CA
State Tax Type:Progressive
Est. Effective Rate:9%
San Diego, CA
State Tax Type:Progressive
Est. Effective Rate:7.5%
San Jose, CA
State Tax Type:Progressive
Est. Effective Rate:9%
Seattle, WA
State Tax Type:None
Est. Effective Rate:0%
Portland, OR
State Tax Type:Progressive
Est. Effective Rate:7%
Denver, CO
State Tax Type:Flat
Est. Effective Rate:4.4%
Las Vegas, NV
State Tax Type:None
Est. Effective Rate:0%