brametric.com

You can get a working bra size at home with two measurements: a snug underbust and a standing bust. Take both with a soft tape held level, then either run them through the calculator on brametric.com or apply the site's Underbust+4 or Underbust+0 formula by hand. The method works for anyone who can hold a tape measure steady; the only real requirement is that the tape stays horizontal and neither digs in nor hangs loose.

What you need before you start

• A soft measuring tape (or a string plus a ruler)
• A mirror, so you can check the tape is level at the back
• A well-fitting, unpadded bra or no bra at all
• Your measurements in inches or centimeters — the site's calculator accepts either, but you must specify the unit you used

The two measurements

Standing bust

Measure around the fullest part of your breasts while standing or sitting fully upright. Keep the tape parallel to the floor. Don't compress the breast tissue with the tape, and don't let it sag away from your body either — it should just rest against you.

Snug underbust

Place the tape directly under your bust, in a perfectly horizontal line. It should sit firmly against your ribcage, the way a bra band would feel when it's comfortable — snug, but not pressing into the skin.

Write both numbers down before doing any math.

Turning measurements into a size

The site describes two systems, and they give different band sizes from the same underbust measurement.

Underbust+4 method

Common in the US and UK, and used by many online retailers and brands. Take your snug underbust in inches, round it to the nearest even number, then add 4. For example, a 29" underbust rounds to 30", and adding 4 gives a 34 band.

Underbust+0 method

Use the underbust measurement as-is (rounded to the nearest even number) without adding anything. This is the more direct of the two and is what many modern calculators default to.

Cup size comes from the difference between your bust and band measurements. The site publishes separate band and cup charts, plus a converter that translates your result into US, UK, and other sizing systems — useful because a 34D in one system is not a 34D in another.

Using the online calculator

1. Take the two measurements as described above.
2. Enter them into the corresponding fields on the calculator.
3. Specify whether your numbers are in inches or centimeters.
4. Read the result, then check the band and cup charts to confirm, and use the converter if you're shopping a brand that sizes differently.

The calculator page requires JavaScript to run, so if the fields don't respond, check that scripts are enabled in your browser.

How to fit a bra once you have a size

A calculated size is a starting point, not a guarantee. The site's fitting guidance covers the checks worth doing before you commit to a style:

• The band should do most of the support work and sit level all the way around — if it rides up at the back, the band is too loose.
• The center of the bra should lie flat against your sternum.
• The cups should contain all breast tissue without gaping or cutting in.
• Straps should stay put without leaving deep marks.

If the band is right but the cups aren't, adjust cup size rather than band size, and re-check against the cup chart.

Common sticking points

• Rounding the underbust. Both methods round to the nearest even number, so a 31" underbust becomes 32" before you add anything.
• Measuring over a padded bra. This inflates the bust measurement and skews the cup calculation.
• A tape that isn't level. Even a slight tilt at the back changes the number, which is why the mirror matters.
• Assuming one size fits all brands. The converter exists precisely because sizing systems differ; treat your calculated size as brand-specific once you start shopping.

Once you have a size that passes the fit checks, the site's own next step is to use it to find and buy the style you want — but confirm against each brand's chart before ordering.

If you're new to Ahrefs and want to run your first SEO audit, the fastest path is: open Site Explorer, enter your target URL, review the Overview for a health snapshot, then dig into Organic Keywords, Top Pages, and Site Audit to find specific problems. From there, build a short prioritized to-do list instead of trying to fix everything at once.

This tutorial walks through that workflow using a realistic starting scenario, explains what the numbers mean, and shows how to turn findings into actions.

Before You Start: Pick a Narrow Scope

A common beginner mistake is auditing an entire large website on day one. The reports become overwhelming, and you can't tell which issues matter.

Instead, choose one of these starting points:

• A single important page (your homepage or a key product/service page)
• A small site (under ~50 pages, e.g., a personal blog or small business site)
• One section of a bigger site (e.g., /blog/)

For this tutorial, assume you're auditing a small business site with about 30 pages. The same steps scale up later.

You'll need an Ahrefs account to follow along. Ahrefs offers paid plans, and pricing and feature limits change over time, so check the current Pricing page for what's included in each tier before committing.

Step 1: Enter Your Target in Site Explorer

Site Explorer is Ahrefs' core tool for analyzing any website or URL.

1. Open Site Explorer from the top navigation.
2. In the search box, paste your domain (e.g., example.com).
3. Choose the Exact URL or Domain mode depending on scope. For a full-site view, use Domain or Prefix; for a single page, use Exact URL.
4. Press Enter.

You'll land on the Overview report. Don't try to absorb everything — focus on four numbers first.

Reading the Overview Snapshot

Important caveat: Ahrefs' traffic and keyword numbers are estimates based on its own data. They won't match Google Search Console or your analytics exactly. Treat them as directional, not absolute.

Step 2: See What You Already Rank For

Go to Organic Keywords in the left sidebar. This shows queries where your site appears in search results.

Sort by Traffic (descending) to see which pages bring the most estimated visitors. Then look for:

• Keywords ranking in positions 4–15 — these are often the easiest wins. A small content or on-page improvement can push them onto page one.
• Keywords with high volume but low position — potential opportunities if the topic is relevant.
• Irrelevant keywords — if you rank for something off-topic, it may signal thin or mismatched content.

Write down 5–10 of the position 4–15 keywords. These become your first optimization targets.

Step 3: Find Your Best and Weakest Pages

Open Top Pages. This ranks your URLs by estimated organic traffic.

Look for two things:

1. Your top performers — understand what topics and formats work. Can you create more content like this?
2. Pages with traffic but poor rankings — these may need on-page fixes (title, headings, internal links).

If a page gets zero traffic and targets a topic you care about, it's a candidate for a rewrite or consolidation.

Step 4: Run a Technical Site Audit

Now move to Site Audit. This crawls your site and flags technical and on-page issues.

1. Click Site Audit → New project.
2. Enter your domain and set crawl settings (default is usually fine for a small site).
3. Start the crawl and wait for it to finish.

Once complete, you'll see a Health Score and a list of issues grouped by category.

Which Issues to Fix First

Not all issues are equal. Prioritize in this order:

Ignore low-impact warnings (like minor meta description length) until the big items are handled.

Step 5: Turn Findings Into a To-Do List

You now have raw data. Convert it into a short, actionable list. Example:

1. Fix 3 broken links found in Site Audit.
2. Rewrite title tags on 5 pages with duplicate titles.
3. Improve 4 pages ranking in positions 6–12 by adding missing subtopics and internal links.
4. Remove or update 2 thin pages with no traffic.

Keep the list to 5–10 items max for your first audit. Finishing a short list beats starting a long one.

Common Beginner Mistakes

• Chasing every red flag. Site Audit flags many minor issues. Fix what affects rankings and users first.
• Trusting estimates as exact numbers. Ahrefs data is modeled, not measured from your analytics.
• Auditing a huge site too early. Start small to learn the interface.
• Ignoring search intent. A page can be technically perfect but still fail if it doesn't match what searchers want.
• Forgetting to re-crawl. After fixes, run Site Audit again to confirm improvements.

Where to Go Next

Once your first audit is done:

• Compare with competitors using Site Explorer's Competing Domains and Content Gap reports.
• Track keyword rankings over time with Rank Tracker.
• Explore backlink opportunities in the Backlinks and Link Intersect reports.
• Set up recurring Site Audit crawls so new issues surface automatically.

Your first audit isn't about perfection — it's about building a repeatable habit: enter a target, read the key reports, pick the highest-impact fixes, and act. Do that once a month and your site's health compounds.

Bra Size Calculator Online converts your measurements into different national sizing systems by first calculating your band and cup size in one base system, then applying the conversion logic built into its calculator and charts. You enter your snug underbust and standing bust measurements, specify inches or centimeters, and the tool adjusts the result for systems such as US, UK, and others. This is useful when you shop across brands that label sizes differently, but the accuracy depends entirely on taking correct measurements.

What the site actually provides

According to the site's own description, Bra Size Calculator Online offers three connected tools:

• An online calculator that works out your band and cup size from your measurements
• Measurement charts for band size and cup size
• A converter that adjusts calculations to different size systems, including US and UK

The site also notes that you must take measurements strictly according to its instructions and enter them with the correct unit (inches or centimeters). The calculator requires JavaScript to run.

How the conversion process works

The conversion happens in two stages.

Stage 1: Your measurements become a base size

You take two essential measurements:

• Snug underbust — the tape sits comfortably under your bust, perfectly horizontal, firm but not pressing into the skin
• Standing bust — measured standing or sitting fully upright, tape parallel to the ground, not squeezing and not loose

These two numbers are the only inputs the simple method needs.

Stage 2: The base size is mapped to a national system

The site describes two measurement systems used to turn those numbers into a size:

Because the +4 and +0 methods produce different band numbers from the same body, the same person can land on different labeled sizes depending on which system a brand uses. That difference is exactly what the converter is meant to reconcile.

For example, the site's own illustration: a snug underbust of 29 inches rounds to the nearest even number and, under the +4 method, produces a band size of 33 — which then maps to a standard labeled band.

Why the same body gets different numbers in different countries

The core reason is that sizing systems disagree on two things:

1. Whether to add inches to the underbust (+4 vs +0)
2. How cup letters are assigned relative to the band

The site provides separate Bra Band Size Chart and Bra Cup Size Chart sections precisely because band and cup are converted on different scales. A US cup letter does not always correspond to the same UK letter, and band numbers are labeled differently across regions. The converter's job is to take your base calculation and express it in the target system so you can match a brand's own size chart.

How to use it for cross-country shopping

1. Measure your snug underbust and standing bust according to the site's instructions.
2. Enter both values into the calculator and select inches or centimeters.
3. Note your result in the base system.
4. Use the converter to view the equivalent in the system the brand uses (US, UK, etc.).
5. Cross-check against that brand's own size chart before buying, since individual brands can vary within the same national system.

Limits to keep in mind

• The site states that results depend on taking measurements strictly per its instructions — a loose or tight tape changes the output.
• The +4 and +0 methods give different answers, so you need to know which convention a given brand follows.
• The page does not state that the calculator or charts are free, nor does it describe any login requirement; treat access terms as unconfirmed unless you see them on the site.
• Conversion gives you a starting size, not a guarantee of fit across every brand.

Bra Size Calculator Online (brametric.com) is a free web tool that turns two body measurements into a bra size. You enter a snug underbust and a standing bust measurement, and the site calculates your band and cup size and converts the result across sizing systems such as US and UK. It suits anyone who wants to check their size at home before buying, but it needs JavaScript enabled to run, and its accuracy depends entirely on how carefully you measure.

What the site actually offers

The page bundles four things in one place:

• An online calculator at the top of the page that takes your measurements and outputs a size.
• A measurement guide covering a simple two-measurement method and a more advanced multi-measurement method.
• A band size chart and a cup size chart for looking up or cross-checking results.
• A size converter that adjusts the calculation to different national systems, including US and UK.

You can enter measurements in either inches or centimeters, so you are not locked into one unit system.

How the measurement methods differ

The site describes two do-it-yourself approaches, and the choice between them changes your result.

The simple way

You take two measurements:

1. Standing bust — measure around the fullest part of your bust while standing or sitting fully upright. Keep the tape parallel to the floor, snug but not compressing, and not hanging loose.
2. Snug underbust — place the tape directly under your bust, perfectly horizontal. It should sit firmly against your ribcage without pressing into the skin, matching the comfort level you would want in a worn bra.

From these two numbers, the site applies one of two sizing systems:

The example the site gives: a snug underbust of 29 inches rounds to the nearest even number and then has 4 added under the +4 method.

The advanced way

The advanced calculator path uses additional measurements beyond the two basics. The page references a "Bra Measurement Guide for the Advanced Calculator" but the excerpt does not detail those extra steps, so treat the advanced route as a more thorough option you would follow directly on the site rather than something to reconstruct from the summary here.

How to fit a bra once you have a size

A calculated size is a starting point, not a guarantee. The site includes a "How to Fit a Bra" section, and the practical checks that matter when you try a bra on are:

• The band should do most of the support work and sit level all the way around, not ride up at the back.
• The center gore (the piece between the cups) should sit flat against your chest.
• The cups should contain your breast tissue without gaping or cutting in.
• Straps should stay put without digging in; if you need them very tight to feel supported, the band is likely too loose.

If a bra fails these checks, adjust the band size first, then the cup, because band and cup are linked — changing one shifts the other.

What to watch out for

• JavaScript is required. The page states you need JavaScript enabled to run the calculator, so the tool will not work with scripts blocked.
• Measurement error dominates the result. The site stresses taking measurements strictly according to the instructions. A tape that is tilted, too tight, or too loose will produce a wrong size no matter which method you pick.
• The +4 vs +0 choice matters. These two systems can give you different band sizes from the same body, so know which convention the brand you are buying from uses before you order.
• No pricing or account details are indicated on the page, so there is nothing to suggest paid tiers or login requirements from the material available.

Who this is useful for

Use brametric.com if you want a quick calculation plus reference charts in one place, especially if you shop across US and UK brands and need to convert. If you already know your size and just need a chart, the band and cup tables alone will do. If you are between sizes or have had fitting problems before, work through the "How to Fit a Bra" checks after calculating rather than trusting the number on its own.

Bra Size Calculator Online supports two different ways to turn a snug underbust measurement into a band size: the Underbust+4 method and the Underbust+0 method. The difference is exactly what the names suggest. Underbust+4 rounds your snug underbust measurement to the nearest even number and adds 4 inches to get the band size. Underbust+0 uses the underbust measurement itself, rounded to the nearest even number, as the band size. Both methods then compare that band size to your standing bust measurement to determine the cup size. Which one gives you the right fit depends on where you shop and how the brand builds its bras.

The two methods side by side

The two measurements you need are the same for both methods: a snug underbust (tape comfortably under your bust, perfectly horizontal, firm but not pressing into the skin) and a standing bust (tape parallel to the ground while standing or sitting upright, not squeezing and not hanging loose). Only the band calculation changes.

Why the same body can produce two different sizes

Take a 29-inch snug underbust. Under Underbust+4, you round 29 up to 30 and add 4, giving a 34 band. Under Underbust+0, you round 29 up to 30 and stop there, giving a 30 band. That is a two-band-size gap from identical measurements.

The cup size shifts with it. Cup size comes from the difference between your standing bust and the band size, so a smaller band number paired with the same bust measurement produces a larger cup letter. In practice, a 34B under one method can correspond to a 30D or similar under the other — the same body, described two ways.

Which method should you actually use?

Use the method that matches the brand you are buying from, not the one that sounds more modern or more accurate.

• Shopping on Amazon or from US/UK brands like Natori and Calvin Klein: start with Underbust+4, since that is the system these sellers commonly use to label their sizes.
• Shopping from a brand that sizes close to the body: use Underbust+0.
• Not sure which system a brand uses: calculate both, then check the brand's own size chart before ordering. The band chart and cup chart on Bra Size Calculator Online exist precisely so you can convert between systems rather than guess.

A useful sanity check: the band should feel snug on the loosest hook without riding up, and the center of the bra should sit flat against your chest. If a 34 band rides up but a 32 feels tight, you may be a +0 size being sold a +4 label, or the reverse.

Common mistakes that break both methods

• Measuring the underbust too loose or too tight. The tape should feel the way you want the bra to feel — firm, horizontal, not digging in. A loose measurement inflates the band; an over-tight one shrinks it.
• Measuring the bust while leaning or with a padded bra on. Use a standing or seated upright position and no bra, or a thin unpadded one.
• Mixing units. The calculator accepts inches or centimeters, but you must specify which. Entering centimeters as inches will throw off both methods.
• Assuming one method is "correct." Neither is wrong; they are conventions. The right one is the one the brand uses.

FAQ

Does Underbust+4 always add exactly 4? Yes — the method rounds the snug underbust to the nearest even number first, then adds 4. So 29" becomes 34, and 30" becomes 34 as well.

Can I use Underbust+0 if I normally wear a +4 size? You can calculate it, but expect a smaller band and a larger cup letter. Whether it fits depends on the brand's construction, so try before committing if possible.

Which method does Bra Size Calculator Online recommend? The site presents both and lets you choose, because the correct one depends on the sizing system of the brand you are buying from. Use the band and cup charts to convert between them.