What this calculadora actually does

Most Maths tools bury the calculation. Rounding calculadora shows it. Punch in your figures, read the working, share the URL if you need a second opinion.

This is the kind of problem where a stray decimal costs you the mark. Think of one worked example you can reuse — then crunch the numbers and the rest of this page explains what the answer means.

Round any number to the nearest whole, decimal place, significant figure or multiple, with tie-breaking modes (half-up, banker’s rounding) explained.

Following the method end to end

Here's what happens when you plug real numbers in.

Round any number to the nearest whole, decimal place, significant figure or multiple, with tie-breaking modes (half-up, banker’s rounding) explained.

Scenarios where Rounding calculadora pays off

Rounding calculadora is aimed at people arriving with questions like these:

"Round to 2 decimal places"
"Significant figures"
"Bankers rounding"
"What is rounding"
"How to calculate rounding"
"Rounding formula"

When it isn't the right tool

Every tool has an edge where it stops being the right answer. Rounding calculadora is no exception:

For legally binding tax or medical decisions — cross-check with HMRC, NHS or a qualified professional.
For very large or very small extremes the rounding error outgrows the useful precision.
When the underlying rate or threshold has changed since the page was last reviewed — always verify with the primary source.
When the input you have is already a derived figure (net of something) — feeding it in as "gross" will double-subtract.

Mistakes we see over and over

Every time you crunch the numbers for a new scenario, one of these creeps in — it's worth knowing them ahead of time.

Mixing up units — grams in one field, ounces in another, then wondering why the answer is off.
Treating a percentage as a whole number. 20% means 0.20 in the maths, not 20.
Rounding at every step. Keep four decimals internally and only round the final number.
Using last year's thresholds. If the page isn't dated, assume it's stale and check GOV.UK.
Reading a tool like this as advice. It is maths, not a decision — the decision is still yours.

The sources behind the numbers

Where the maths needs an external authority, we cross-check against:

BBC Bitesize
NIST
MathsIsFun

Works well alongside

If this question keeps coming up for you, the same cluster of tools usually comes next:

Scientific Notation calculadora — Convert numbers to and from scientific notation and engineering notation, plus add, subtract, multiply and divide values expressed as a × 10ⁿ.
Percentage calculadora — Work out a percentage of a value, the percentage between two values, and percentage increases or decreases — with the formula shown.
Mean (Average) calculadora — Add up your values and divide by how many there are — we show each step.

How we keep this accurate

Our calculadoras run on pure, unit-tested functions — the same logic lives in the browser and in the CI test suite. When tax rates, thresholds or official figures move, the update lands within 24 hours of the announcement. You can read the editorial policy and corrections policy.

Found an out-of-date number on Rounding calculadora or anywhere else in the Maths toolkit? Send it to the editorial desk and we'll patch it. Or browse the full calculadora directory for the next tool you need.

Frequently asked questions

Round to 2 decimal places?

Practically speaking, feed the figures into the Rounding calculadora widget and it'll show the working. Round any number to the nearest whole, decimal place, significant figure or multiple, with tie-breaking modes (half-up, banker’s rounding) explained.

Significant figures?

Here's the plain-English summary: open the Rounding calculadora widget at the top of the page. Round any number to the nearest whole, decimal place, significant figure or multiple, with tie-breaking modes (half-up, banker’s rounding) explained.

Bankers rounding?

In one line: this question usually arrives alongside Scientific Notation calculadora, Percentage calculadora, Mean (Average) calculadora. The Rounding calculadora handles the specific case above; the others cover adjacent ground.

What is rounding?

Put simply, every figure is cross-checked against BBC Bitesize and the wider data. If you notice a stale rate, email the editorial desk and we'll patch it in under 24 hours.

How to calculate rounding?

Short answer: yes, everything runs in your browser. No inputs are sent to our servers or any third party, nothing is logged and nothing persists after you close the tab.

Rounding formula?

Quick version: Rounding calculadora is free to use, free to share and free to embed — pass the URL around a class, a slack channel or a family chat. The editorial policy covers attribution.

Rounding example?

Practically speaking, the short method: write the inputs in the units shown, run the calculation, then sense-check the answer against an order-of-magnitude estimate in your head.

Rounding worked example?

Here's the plain-English summary: if the result surprises you, run it a second time with slightly different inputs — small swings often reveal a unit or rounding issue in the original figures.

Rounding explained?

In one line: a calculadora is a sanity check, not a verdict. For anything legally binding — contracts, tax filings, medical decisions — bring the figure to a qualified professional as a starting point.

Rounding definition?

Put simply, Round any number to the nearest whole, decimal place, significant figure or multiple, with tie-breaking modes (half-up, banker’s rounding) explained. The page walks through the method in full so you can answer follow-up questions without guessing.

Rounding meaning?

Short answer: open the Rounding calculadora widget at the top of the page. Round any number to the nearest whole, decimal place, significant figure or multiple, with tie-breaking modes (half-up, banker’s rounding) explained.

Rounding step by step?

Quick version: open the Rounding calculadora widget at the top of the page. Round any number to the nearest whole, decimal place, significant figure or multiple, with tie-breaking modes (half-up, banker’s rounding) explained.

How it works