What Is 1/8 as a Percentage? Answer: 12.5%
Updated · By the SolverCalc team
Quick answer
1/8 = 0.125 = 12.5% exactly.
One eighth appears in measurements, recipes and pizza slices. Because 8 is a power of 2, the decimal ends after three digits, so 1/8 has an exact percentage with no rounding.
Divide and multiply by 100
- Divide 1 by 8: 1 ÷ 8 = 0.125.
- Multiply by 100 to convert to a percent: 0.125 × 100 = 12.5.
- Answer: 1/8 = 12.5%.
The halving shortcut
If you remember that one half is 50%, you can halve your way to one eighth: half of 50% is 25% (one quarter), and half of 25% is 12.5% (one eighth). This mental trick is handy when you do not have a calculator nearby.
Scaling to 100
To make the denominator 100, multiply 8 by 12.5. Do the same to the numerator: 1 × 12.5 = 12.5. That gives 12.5/100, which is 12.5%. Decimals in the numerator are fine when you scale this way.
All eighths as percentages
| Fraction | Decimal | Percentage |
|---|---|---|
| 1/8 | 0.125 | 12.5% |
| 2/8 (= 1/4) | 0.25 | 25% |
| 3/8 | 0.375 | 37.5% |
| 4/8 (= 1/2) | 0.5 | 50% |
| 5/8 | 0.625 | 62.5% |
| 6/8 (= 3/4) | 0.75 | 75% |
| 7/8 | 0.875 | 87.5% |
Each eighth adds 12.5%, so you can build any row of this table by multiplying the numerator by 12.5.
Quick check
Eight slices of 12.5% each add up to 100%, which confirms the answer. On the solve calculator, type 1 ÷ 8 × 100 and press equals to see 12.5.
One eighth in everyday life
- Measuring: 1/8 inch = 0.125 inch, a common mark on tape measures and rulers.
- Cooking: 1/8 cup equals 2 tablespoons, because a cup holds 16 tablespoons.
- Shopping: a 12.5% discount is the same as taking 1/8 off the price, so $40 becomes $35.
- Time: 1/8 of an hour is 7.5 minutes.
Recognizing 12.5% as one eighth turns many mental-math problems into a single division by 8.