Find your perfect starting size for the ultimate lift and cleavage with Upbra bras.
Measure around your ribcage, just under your breasts.
Measure around the fullest part of your bust.
Inches (in)
Centimeters (cm)
How to Find Your Perfect Upbra Fit
Getting the right bra size is the first step to experiencing the incredible lift and cleavage that Upbra bras provide. An incorrect size can lead to discomfort and prevent you from getting the desired effect. This calculator uses the modern US/UK sizing method to give you an accurate starting point.
How to Measure Yourself Correctly
For the most accurate results, use a soft, flexible measuring tape. It's best to measure while wearing a thin, non-padded bra or no bra at all.
Measure Your Underbust (Band Size): Wrap the measuring tape snugly around your ribcage, directly underneath your bust where a bra band would sit. Make sure the tape is level and parallel to the floor all the way around. Exhale fully and note the measurement.
Measure Your Overbust (Cup Size): Wrap the tape measure around the fullest part of your bust, typically at nipple level. The tape should be comfortably loose, not digging into your breast tissue, and parallel to the floor. Note the measurement.
Example Calculation
Let's see how the calculation works with a real-world example:
Underbust Measurement: 31 inches
Overbust Measurement: 36 inches
Band Size Calculation: The modern fitting method takes the underbust measurement (31″) and rounds it up to the nearest even number, which is 32. This is your band size.
Cup Size Calculation: The difference between the overbust and the raw underbust is calculated: 36″ – 31″ = 5″. A 5-inch difference corresponds to a DD cup.
Resulting Size: The estimated starting size is 32DD.
Understanding Sister Sizes
Your bra size isn't just one single number and letter combination. "Sister sizes" are alternate sizes where the cup volume stays the same, even though the band and cup letter change. This is useful if your calculated size feels too tight or too loose in the band.
If the band feels too tight: Go up one band size and down one cup size. (e.g., from 32DD to 34D).
If the band feels too loose: Go down one band size and up one cup size. (e.g., from 32DD to 30DDD/F).
Because Upbra bras are designed for significant lift, a snug band is crucial for support. Many women prefer the fit of a sister size down for maximum effect.
Disclaimer: This calculator provides an estimated size based on your measurements. Bra fit can be affected by breast shape, brand, and style. The best way to find your perfect fit is to use this result as a starting point and try on different sizes if necessary.
function calculateUpbraSize() {
var underbustInput = document.getElementById("underbust").value;
var overbustInput = document.getElementById("overbust").value;
var units = document.getElementById("units").value;
var resultDiv = document.getElementById("result");
var underbust = parseFloat(underbustInput);
var overbust = parseFloat(overbustInput);
if (isNaN(underbust) || isNaN(overbust) || underbust <= 0 || overbust <= 0) {
resultDiv.innerHTML = 'Please enter valid, positive numbers for both measurements.';
resultDiv.style.display = 'block';
resultDiv.style.backgroundColor = '#f8d7da';
resultDiv.style.borderColor = '#dc3545';
return;
}
if (units === 'cm') {
underbust = underbust / 2.54;
overbust = overbust / 2.54;
}
if (overbust <= underbust) {
resultDiv.innerHTML = 'Your overbust measurement must be larger than your underbust measurement. Please check your numbers.';
resultDiv.style.display = 'block';
resultDiv.style.backgroundColor = '#f8d7da';
resultDiv.style.borderColor = '#dc3545';
return;
}
var bandSize = Math.round(underbust);
if (bandSize % 2 !== 0) {
bandSize = bandSize + 1;
}
var cupDifference = overbust – underbust;
var cupSize = "";
if (cupDifference < 1) { cupSize = "AA"; }
else if (cupDifference < 2) { cupSize = "A"; }
else if (cupDifference < 3) { cupSize = "B"; }
else if (cupDifference < 4) { cupSize = "C"; }
else if (cupDifference < 5) { cupSize = "D"; }
else if (cupDifference < 6) { cupSize = "DD"; }
else if (cupDifference < 7) { cupSize = "DDD/F"; }
else if (cupDifference < 8) { cupSize = "G"; }
else if (cupDifference < 9) { cupSize = "H"; }
else if (cupDifference < 10) { cupSize = "I"; }
else if (cupDifference 0) ? cupSizesArray[currentCupIndex – 1] : "";
var sisterDownBand = bandSize – 2;
var sisterDownCup = (currentCupIndex > -1 && currentCupIndex < cupSizesArray.length – 1) ? cupSizesArray[currentCupIndex + 1] : "";
var resultHTML = '
';
resultHTML += 'If the band feels too tight, or you prefer a looser fit, try your sister size up:';
if (sisterUpCup) {
resultHTML += " + sisterUpBand + sisterUpCup + ";
} else {
resultHTML += 'N/A';
}
resultHTML += 'For a snugger band and maximum lift, try your sister size down:';
if (sisterDownCup && sisterDownBand >= 28) {
resultHTML += " + sisterDownBand + sisterDownCup + ";
} else {
resultHTML += 'N/A';
}
resultHTML += 'Remember, this is a starting point. A snug band is key for the Upbra lift effect!';
resultDiv.innerHTML = resultHTML;
resultDiv.style.display = 'block';
resultDiv.style.backgroundColor = '#d4edda';
resultDiv.style.borderColor = '#28a745';
}