CAGR Calculator UK

What Is CAGR?

CAGR (Compound Annual Growth Rate) is the average annual growth rate of an investment over a specific period, assuming the investment grows at a steady rate. This CAGR calculator UK helps you measure the true annual return on your investments, smoothing out volatility to give you a clear picture of long-term performance.

CAGR is one of the most important metrics for investors. Unlike simple average returns, CAGR accounts for the effect of compounding, giving you a more accurate representation of how your investments have performed over time. Whether you're evaluating a stock portfolio, a property investment, or a business venture, CAGR provides a standardised way to compare performance across different investment types.

How to Use the CAGR Calculator

Using this compound annual growth rate calculator is straightforward. Enter the following details:

• Initial Value: The starting value of your investment
• Final Value: The ending value of your investment
• Years Held: The number of years you held the investment
• Additional Contributions: Any extra amounts invested during the period (optional)

Click Calculate CAGR to see your compound annual growth rate, total return, and whether your investment is growing, declining, or flat.

How CAGR Is Calculated

The formula for CAGR is:

Where Total Invested = Initial Value + Additional Contributions. This formula assumes that additional contributions are made at the start of the investment period.

Step-by-Step CAGR Example

Let's walk through a practical example. Suppose you invested:

• Initial Value: £10,000
• Final Value: £15,000
• Years Held: 5 years
• Additional Contributions: £2,000

Here's how the calculation works:

• Total Invested: £10,000 + £2,000 = £12,000
• Growth Factor: £15,000 ÷ £12,000 = 1.25
• Annualised Growth Factor: 1.25^(1/5) = 1.0456
• CAGR: (1.0456 − 1) × 100 = 4.56%
• Total Return: £15,000 − £12,000 = £3,000 (25%)

If you had made no additional contributions, the CAGR would have been 8.45% — highlighting how contributions affect the growth rate calculation.

Understanding CAGR: Key Concepts

• CAGR: The average annual return rate over a specific period
• Positive CAGR: Your investment grew over the period
• Negative CAGR: Your investment declined over the period
• CAGR vs Total Return: CAGR smooths out volatility to show annualised performance
• CAGR vs ROI: CAGR is annualised, while ROI is the total return

Good CAGR Benchmarks for UK Investors

What constitutes a "good" CAGR depends on the type of investment and the risk level:

• Savings Account: 0.5-4% (low risk)
• UK Government Gilts: 2-5% (low risk)
• Corporate Bonds: 3-6% (medium risk)
• FTSE 100: 5-7% historical average (medium risk)
• Global Stocks: 7-10% historical average (medium-high risk)
• UK Property: 4-8% (medium risk)
• Startups/Small Caps: 20%+ possible (high risk)

How Additional Contributions Affect CAGR

When you add contributions during the investment period, the CAGR calculation adjusts to account for the total amount invested. This is important because:

• Additional contributions increase the total amount invested
• This can lower the CAGR if the final return doesn't keep pace
• It provides a more accurate picture of your actual performance
• Always include contributions for an accurate CAGR calculation

Common CAGR Calculation Mistakes

• Not including additional contributions: This can overstate your actual CAGR
• Ignoring the time value of money: CAGR accounts for time, unlike simple returns
• Not considering risk: Higher CAGR often means higher risk
• Ignoring inflation: Real CAGR (nominal minus inflation) shows purchasing power growth
• Forgetting fees and charges: Investment fees reduce your actual CAGR
• Comparing different time periods: CAGR helps normalise for time

Important Assumptions and Limitations

• Does not account for inflation (use Real CAGR for purchasing power)
• Does not include investment fees or charges
• Does not account for taxes on returns
• Assumes additional contributions are made at the start of the period
• Does not account for timing of withdrawals or reinvestment
• Results are estimates, not guaranteed

Real CAGR vs Nominal CAGR

While nominal CAGR shows the percentage growth, Real CAGR adjusts for inflation to show the actual increase in purchasing power. To calculate Real CAGR, subtract the average inflation rate during the period from the nominal CAGR. For example, if nominal CAGR is 8% and inflation is 3%, the Real CAGR is approximately 5%.

Using CAGR to Compare Investments

CAGR is particularly useful for comparing investments with different time periods. For example, you can compare a 5-year investment with a 10-year investment using CAGR, which normalises the returns on an annual basis. This is one of the most powerful features of CAGR as a metric.

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