Round any number to the nearest tenth, hundredth, whole number, or any decimal place. Batch-round many numbers at once, practice with quiz mode, and see the exact rounding rule applied with step-by-step working. Free, private, no signup.
| Original | Nearest tenth | Nearest hundredth | Nearest whole |
|---|---|---|---|
| 3.47 | 3.5 | 3.47 | 3 |
| 2.851 | 2.9 | 2.85 | 3 |
| 9.94 | 9.9 | 9.94 | 10 |
| 0.55 | 0.6 | 0.55 | 1 |
| 12.05 | 12.1 | 12.05 | 12 |
| -2.851 | -2.9 | -2.85 | -3 |
| 0.049 | 0.0 | 0.05 | 0 |
| 99.99 | 100.0 | 99.99 | 100 |
| 1.005 | 1.0 | 1.01 | 1 |
| 7.777 | 7.8 | 7.78 | 8 |
toFixed() returns 1.00 because of floating-point representation issues. Our calculator uses a custom rounding function with an epsilon adjustment to guarantee correct decimal rounding — the "1.01" shown above is the mathematically correct answer.Nearest Tenth Calculator: Round Any Number with Step-by-Step Working
Rounding to the nearest tenth is one of the first decimal skills students learn — and one of the most commonly misunderstood. The rule sounds simple: look at the hundredths digit, and if it is 5 or more, round up. But when you apply it in practice, small details trip people up. Does 9.94 round to 9.9 or 10.0? Does 0.049 round to 0.0 or 0.1? What about negative numbers, or numbers with many decimal places?
Our free Nearest Tenth Calculator answers all of these instantly, showing not just the answer but the exact digit-by-digit working so you can see why the answer is what it is. It also handles hundredths, thousandths, whole numbers, significant figures, and batch rounding of hundreds of numbers at once.
What "Nearest Tenth" Actually Means
The tenth place is the first digit to the right of the decimal point. In 3.47, the digit in the tenth place is 4. In 0.851, it is 8. To round to the nearest tenth, you look at the digit immediately to the right — the hundredths digit — and apply the standard rule:
If the hundredths digit is 5 or more, round the tenths digit up by 1. If it is less than 5, leave the tenths digit unchanged.
So 3.47 becomes 3.5 (7 ≥ 5, round up). 3.42 becomes 3.4 (2 < 5, keep same). 9.94 becomes 9.9 — even though 9 is at the end of the digit sequence, the hundredths digit is 4, so it stays as 9.9. Trailing zeros matter too: 1.2 rounded to two decimals is written 1.20, not 1.2, because the trailing zero signals the precision level.
The Half-Way Case: What About 5?
When the hundredths digit is exactly 5, the number sits precisely halfway between two tenths. Different fields handle this differently:
Round half up (school standard). 2.5 → 3. 3.5 → 4. Always rounds away from zero. This is what most school curriculums teach, and what our calculator uses by default.
Round half to even (banker's rounding). 2.5 → 2. 3.5 → 4. Rounds to the nearest even digit. Used in finance and accounting to reduce systematic bias over many calculations.
Round half down. 2.5 → 2. Always rounds toward zero. Rarely used outside specific statistical contexts.
For most homework, exam, and everyday calculations, the "round half up" rule is expected. Our calculator uses this method and states the rule applied on every result.
Common Rounding Mistakes to Avoid
Don't cascade. 1.449 rounded to one decimal place is 1.4, not 1.5. A common mistake is to round 1.449 → 1.45 → 1.5 by rounding in stages. Only the digit immediately to the right of your target place matters — all other digits are dropped at once.
Negative numbers round by absolute value. -2.851 rounded to the nearest tenth is -2.9 (not -2.8). The rule applies to the magnitude of the number, and the sign is preserved.
Integers have hidden precision. 1234 rounded to 2 significant figures is not "1200" — that would be ambiguous. In scientific and statistical contexts, the correct answer is 1.2 × 10³. Our calculator detects this case and switches to scientific notation automatically.
Beyond the Tenth: Decimal Places, Sig Figs, and Batch Mode
The calculator also handles rounding to the nearest hundredth, thousandth, and ten-thousandth — as well as whole numbers, nearest 5, 10, 100, and 1000. The Significant Figures tab rounds to 1–6 sig figs with proper trailing-zero handling. And the Batch Rounding tab lets you paste a list of up to 500 numbers and round them all at once — ideal for teachers preparing example sets, or students checking homework in bulk.
Practice Mode for Students
The Practice Mode tab generates random rounding questions and checks your answers instantly. Every question shows the full step-by-step working after you check, so you learn the rule rather than just memorising it. Score tracking with a streak counter makes it a genuine study aid — not just a calculator.
Private, Fast, and Free
Everything runs in your browser. No sign-up, no data collection, no limits. Your last-used settings are remembered locally on your device, but nothing is ever sent to a server. Use it for homework, teaching, data analysis, or just checking your mental math.