Converting fractions into decimals is a basic but essential math skill used in daily life, education, measurements, cooking, and technical work. One of the most common small fractions people encounter is 1/8.
So the question is simple:
What is 1/8 as a decimal?
In this guide, you’ll learn how to convert 1/8 into a decimal step by step, understand whether it is a terminating or repeating decimal, explore place value, and see real-life examples where this conversion is useful.
What Is a Fraction?
A fraction represents a part of a whole and consists of two parts:
- Numerator – the top number, showing how many parts are taken
- Denominator – the bottom number, showing how many equal parts make up the whole
In the fraction 1/8:
- Numerator = 1
- Denominator = 8
To convert any fraction into a decimal, divide the numerator by the denominator.
So for 1/8, we calculate:
1 ÷ 8
Converting 1/8 into a Decimal
Step 1: Divide the Numerator by the Denominator
Since 1 is smaller than 8, the result will be less than 1. We add a decimal point and continue dividing.
Step 2: Perform Long Division
Follow the division process:
- 8 goes into 10 1 time (8 × 1 = 8)
- Remainder: 10 − 8 = 2
- Bring down a 0 → 20
- 8 goes into 20 2 times (8 × 2 = 16)
- Remainder: 20 − 16 = 4
- Bring down a 0 → 40
- 8 goes into 40 5 times (8 × 5 = 40)
- Remainder: 0
The division ends here.
✅ Final Decimal Result
1 ÷ 8 = 0.125
So,
1/8 as a decimal = 0.125
If you’re converting in the opposite direction, you may also want to see 0.125 as a fraction, which explains how this decimal is written in fractional form.
Is 1/8 a Repeating Decimal?
No, 1/8 is not a repeating decimal.
The decimal 0.125 ends after three decimal places, which makes it a terminating decimal.
This happens because the denominator 8 = 2 × 2 × 2, and fractions whose denominators contain only factors of 2 and/or 5 always convert into terminating decimals.
Understanding 0.125 Using Place Value
The decimal 0.125 can be broken down using place value:
- 0.1 = 1 tenth = 1/10
- 0.02 = 2 hundredths = 2/100
- 0.005 = 5 thousandths = 5/1000
So:
0.125 = 1/10 + 2/100 + 5/1000
This breakdown helps visualize how the decimal represents fractional parts of a whole.
Real-Life Uses of 1/8 as a Decimal
📏 Measurements
- 1/8 inch = 0.125 inches
- Common in construction, carpentry, and machining
🍳 Cooking & Baking
- Recipes often include 1/8 teaspoon or 1/8 cup
- Digital scales may display this as 0.125
💰 Money & Finance
- 0.125 dollars = 12.5 cents
- Used in pricing, discounts, and calculations
🧪 Science & Engineering
- Decimals like 0.125 are used for precision
- Helpful when converting fractional values into decimal form
Comparing Common Fractions and Decimals
| Fraction | Decimal |
| 1/8 | 0.125 |
| 1/4 | 0.25 |
| 3/8 | 0.375 |
| 1/2 | 0.5 |
| 5/8 | 0.625 |
Rounding and Approximation
In some situations, decimals are rounded for convenience:
- 0.125 rounded to two decimal places → 0.13
- Rounded to one decimal place → 0.1
Rounding is useful when perfect precision is not required, such as estimates or quick calculations.
Common Mistakes to Avoid
- ❌ Writing 1/8 as 0.12 without rounding explanation
- ❌ Confusing 1/8 with 1/4
- ❌ Assuming all fractions produce repeating decimals
- ❌ Forgetting that 1/8 is smaller than 0.2
Always divide carefully and verify the result.
FAQs: 1/8 as a Decimal
What is 1/8 as a decimal?
1/8 as a decimal is 0.125.
Is 1/8 a terminating decimal?
Yes. The decimal ends after three places.
Why does 1/8 not repeat?
Because the denominator contains only the factor 2.
What is 1/8 as a percentage?
0.125 × 100 = 12.5%
Is 1/8 smaller than 1/4?
Yes.
- 1/8 = 0.125
- 1/4 = 0.25
Final Answer
1/8 as a decimal = 0.125
Key Takeaway
To convert 1/8 into a decimal:
- Divide 1 by 8
- Perform long division
- Get 0.125
- Confirm it is a terminating decimal
Understanding fraction-to-decimal conversions like this helps in math, measurements, cooking, finance, and technical work, making everyday calculations clearer and more accurate.
