Investment Growth Planner

Calculate investment projections with real UK inflation data. Compare low/medium/high risk scenarios and see the impact of time, contributions, and fees. Set goals or project future wealth.

⏱️ 5-10 minutes • 💪 Standard

Updated January 2026

How This Tool Works

📋 Purpose

This tool helps you estimate how your investments could grow over time using compound interest calculations. Understand the impact of regular contributions, time horizon, and different risk levels on your future wealth.

⚙️ How It Works

  1. 1
    Choose between Projection Mode (forecast growth) or Goal Mode (calculate required contributions)
  2. 2
    Enter your initial lump sum and monthly contribution amounts
  3. 3
    Select your time horizon (1-40 years) and risk level (low/medium/high)
  4. 4
    Review three scenarios: conservative, medium, and optimistic growth projections
  5. 5
    Explore milestones, insights, and what-if scenarios to optimize your strategy
1 year40 years
Future Value (Nominal)
£84,664
Future Value (Real Terms)
£51,668
Adjusted for inflation
Total Contributed
£49,000
Investment Growth
£35,664
72.8% gain

📈 Growth Scenarios

£0k£24k£48k£72k£95k02468101214161820
Low (5.0%)
Medium (6.0%)
High (7.0%)

🎯 Milestones

£10,000Year 4
£25,000Year 9
£50,000Year 14

💡 Key Insights

  • Your biggest lever is TIME: an extra 5 years could add £40,505
  • Increasing monthly contributions by £50 would add £27,240 after 20 years
  • Platform fees will cost you approximately £3,829 over the period
  • Inflation reduces your real purchasing power by 39.0%

📊 What If Scenarios

Double monthly contribution
+£92,584
Add 5 more years
+£40,505
Remove platform fees
+£5,185

📅 Year-by-Year Projection

YearContributedNominalReal ValueFees Paid
0£1,000£1,000£1,000£0
1£3,400£3,500£3,415£18
2£5,800£6,128£5,833£48
3£8,200£8,891£8,256£93
4£10,600£11,794£10,685£152
5£13,000£14,847£13,122£227
...
17£41,800£66,245£43,536£2,649
18£44,200£72,081£46,216£3,011
19£46,600£78,216£48,926£3,404
20£49,000£84,664£51,668£3,829

⚠️ Educational illustration only, not financial advice

• Past performance does not guarantee future results

• Returns shown are estimates based on historical averages

• Consider seeking advice from a qualified financial advisor

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