Stock Price Calculator Using P/E Ratio & EPS Growth
Stock Price Prediction Calculator
Future Stock Price Formula
| Future Stock Price = Current Stock Price × | Future P/E Ratio | × | Future EPS |
| Current P/E Ratio | Current EPS |
Variables
- Current Stock Price = Today's market price per share
- Current P/E = Current Price-to-Earnings Ratio
- Future P/E = Expected future Price-to-Earnings Ratio
- Current EPS = Current Earnings Per Share
- Future EPS = Projected Earnings Per Share
Stock Price Prediction Formula
How to Use our Price Prediction Calculator
Step 1: Enter Your Current Stock Data
Start by filling in the input boxes with your stock’s current information:
| Field | What to Enter | Example |
| Current stock price | The stock’s price today | $150.25 |
| Current P/E ratio | The stock’s current P/E multiple | 18.7 |
| Current EPS | The company’s earnings per share (TTM) | $8.03 |
Use the “Qtr” or “Year” buttons next to EPS to tell the calculator if your EPS number is quarterly or yearly.
Step 2: Enter Your Future Projections
Now enter information into the calculator for what you expect in the future:
| Field | What to Enter | Example |
| Future EPS | Your projected earnings per share | $12.55 |
| Lower P/E | Your most conservative P/E estimate | 20 |
| Avg P/E | Your most realistic P/E estimate | 25 |
| Higher P/E | Your most optimistic P/E estimate | 35 |
Step 3: Read Your Results Instantly
The calculator automatically updates as you type. You’ll see:
Three Future Price Scenarios:
- Lower: The lowest projected price (using your Lower P/E)
- Average: The most likely projected price (using your Avg P/E)
- Higher: The highest projected price (using your Higher P/E)
Step-by-Step Calculation Details:
The calculator shows you exactly how it got each number:
- Normalize EPS: Shows how EPS was converted to quarterly
- EPS Ratio: The growth factor (Future EPS ÷ Current EPS)
- Formula Applied: Shows the math: Current Price × (Future P/E ÷ Current P/E) × EPS Ratio
- Each Scenario: Detailed calculation for Low, Avg, and Max
Understanding Concepts
What is Current Stock Price?
Simply put: The current stock price is exactly what it sounds like. It’s the price you’d pay right now to buy one share of a company’s stock.
Real-World Example:
Imagine you want to buy a share of Apple stock. You open your phone, check your stock app, and see Apple is trading at **$350.50**. That $350.50 is the current stock price – it’s the price today, at this very moment.
Stock prices change constantly throughout the trading day, just like gas prices change at the pump.
What is P/E Ratio (Price-to-Earnings Ratio)?
Simply put: The P/E ratio tells you how much investors are willing to pay for each $1 of the company’s earnings (not revenue).
Real-World Example:
Let’s say Company A has:
- Stock price: $100
- Earnings per share (EPS): $5
P/E Ratio = $100 ÷ $5 = 20
This means investors are paying $20 for every $1 of earnings the company makes.
| P/E Ratio | What It Means | Example |
| Lower P/E (like 10-15) | The stock is cheaper relative to its earnings. Might be undervalued or facing problems. | A mature bank might have a P/E of 12 |
| High P/E (like 30-40) | Investors expect high future growth. They’re paying a premium for future potential. | A fast-growing tech company might have a P/E of 35 |
Simple Analogy:
- Low P/E = Buying a house in a quiet neighborhood for $200,000 (good deal)
- High P/E = Buying a house in a trendy neighborhood for $800,000 (paying for future potential)
What is EPS (Earnings Per Share)?
Simply put: EPS tells you how much profit the company makes for each share of stock. It’s the company’s “profit per share.”Real-World Example:
Company B makes:- Total profit: $1,000,000
- Number of shares: 100,000
- The whole pizza = Total company profit
- Each slice = One share of stock
- EPS = How much pizza you get per slice
- Each slice has 10 ounces of pizza – that’s like EPS!
Why EPS Matters:
- Higher EPS = Company is making more profit per share
- Growing EPS = Company is becoming more profitable over time
- EPS helps calculate P/E ratio (which we discussed above)
What is Forward P/E (Future P/E)?
Simply put: Forward P/E is an estimate of what the P/E ratio will be in the future, based on expected future earnings rather than current earnings.
Real-World Example:
Company C today:
- Stock price: $100
- Current EPS: $5
- Current P/E: $100 ÷ $5 = 20
But analysts expect Company C to earn $6 per share next year:
- Future EPS estimate: $6
- Forward P/E = $100 ÷ $6 = 16.7
The forward P/E (16.7) is lower than the current P/E (20) because earnings are expected to grow!
Simple Analogy:
Imagine you’re buying a small bakery:
- Current P/E = What you pay based on today’s profits
- Forward P/E = What you pay based on next year’s expected profits
If the bakery makes $50,000 today** but you expect it to make **$70,000 next year:
- Current P/E is based on the $50,000
- Forward P/E is based on the $70,000 (better deal!)
Why Forward P/E Matters:
Looks to the future – It focuses on where the company is going
Can be more valuable – A stock might look expensive today but cheap based on future earnings
Helps with predictions – Investors use it to decide if a stock is a good buy
What is Future Stock Price?
Simply put: The future stock price is an educated guess of what a stock might be worth in the future based on expected earnings and P/E ratios.
Real-World Example:
Let’s say Company D today:
- Current Stock Price: $100
- Current EPS: $5
- Current P/E: 20
You expect:
- Future EPS: **$6** (earnings grow by $1)
- Future P/E: 22 (investors are willing to pay more)
Future Stock Price = Future EPS × Future P/E = $6 × 22 = $132
So you predict the stock will go from $100 to $132 – a 32% increase!
Simple Analogy:
Think of a lemonade stand you might start:
Today:
- You make $50 in profit (EPS)
- Someone offers to buy your stand for $1,000
- P/E = $1,000 ÷ $50 = 20
Next year (your prediction):
- You expect to make $70 in profit (future EPS)
- You think someone might pay 22× your profit (future P/E)
- Future price = $70 × 22 = **$1,540**
You’re predicting your lemonade stand will be worth $1,540 next year – that’s the future stock price!
The Formula Used for Calculating Future Stock Price:
Future Stock Price = Current Price × (Future P/E ÷ Current P/E) × (Future EPS ÷ Current EPS)
Using our calculator:
- Current Price: $100
- Current P/E: 20
- Current EPS: $5
- Future EPS: $6
- Future P/E: 22
Calculation:
- P/E Ratio = 22 ÷ 20 = 1.1 (P/E grows by 10%)
- EPS Ratio = 6 ÷ 5 = 1.2 (EPS grows by 20%)
- Future Price = $100 × 1.1 × 1.2 = **$132**
The Three Scenarios:
Our calculator shows three possible future prices:
| Scenario | Future P/E | Future Price |
| Lower | 18 (lower) | $108 |
| Average | 22 (expected) | $132 |
| Higher | 26 (higher) | $156 |
Frequently Asked Questions (FAQs)
1. How do you calculate a future stock price?
You can estimate a future stock price using the current stock price, current P/E ratio, projected future P/E ratio, current earnings per share (EPS), and projected future EPS. A common formula is: Future Stock Price = Current Stock Price × (Future P/E ÷ Current P/E) × (Future EPS ÷ Current EPS).
2. What is a stock price calculator?
A stock price calculator is an online tool that estimates the potential future value of a stock based on earnings growth and valuation multiples such as the Price-to-Earnings (P/E) ratio. It helps investors compare different growth scenarios.
3. What is the P/E ratio?
The Price-to-Earnings (P/E) ratio measures how much investors are willing to pay for each dollar of a company's earnings. It is calculated by dividing the current stock price by earnings per share (EPS).
4. How does EPS affect stock price?
Higher earnings per share (EPS) generally increase a company's valuation if the P/E ratio remains constant. Growing earnings often lead to higher stock prices over time.
5. Can a higher P/E ratio increase a stock's price?
Yes. If investors assign a higher P/E ratio because they expect stronger future growth, the stock price may increase even if earnings remain unchanged. This is known as P/E expansion.
6. What is the difference between current EPS and future EPS?
Current EPS represents the company's reported earnings per share, while future EPS is an analyst's or investor's estimate of future earnings. Future EPS is commonly used to estimate potential stock prices.
7. Is this stock price calculator accurate?
This calculator provides an estimate based on the values you enter. Actual stock prices depend on many factors including company performance, market conditions, interest rates, investor sentiment, and economic events.
8. Can I use this calculator for any stock?
Yes. This calculator works for most publicly traded companies as long as you know the current stock price, current P/E ratio, current EPS, and projected future EPS. You may also enter an expected future P/E ratio for more advanced estimates.
9. What happens if the future P/E ratio is lower than the current P/E?
If the future P/E ratio decreases, the estimated stock price may decline even if earnings grow. This situation is called P/E compression and often occurs when market expectations weaken.
10. Why should investors compare different P/E scenarios?
Testing multiple future P/E ratios helps investors understand how changes in market valuation may affect a stock's potential price. Comparing optimistic, neutral, and conservative scenarios can improve investment decision-making.
References
-
Price-Earnings (P/E) Ratio – Investor.gov
https://www.investor.gov/introduction-investing/investing-basics/glossary/price-earnings-pe-ratio -
Financial Performance Metrics Every Investor Should Know – FINRA.org
https://www.finra.org/investors/insights/financial-performance-metrics-every-investor-should-know -
Evaluating Stocks – FINRA.org
https://www.finra.org/investors/investing/investment-products/stocks/evaluating-stocks -
Beginners' Guide to Financial Statements – U.S. Securities and Exchange Commission (SEC)
https://www.sec.gov/about/reports-publications/beginners-guide-financial-statements -
Introduction to Corporate Finance – Massachusetts Institute of Technology (MIT OpenCourseWare)
https://ocw.mit.edu/courses/15-401-finance-theory-i-fall-2008/