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Calcimator

Nail Extension Length Calculator

Determine tip sizes, product usage, and breakage risk based on natural nail measurements and desired extension length.

Inputs

Results

Extension length (mm)

13

Estimated tip size (#)6
Product per nail (mL)0.65
Product for full set (mL)7.2
Breakage risk score13/100
Fill interval (weeks)2.6
Total nail area (mm²)325
Extension area (mm²)182
How to Use This Calculator
  1. Measure and enter nail bed width (mm) and nail bed length (mm) for the client.
  2. Enter the desired total nail length (mm) from cuticle to tip.
  3. Select nail shape (square, round, oval, almond, coffin, or stiletto) and application method.
  4. Read the extension length (mm) beyond the natural nail and the estimated tip size.
  5. Review the breakage risk score (/100) and recommended fill interval (weeks) for the chosen length and shape.
  6. Use product per nail (mL) and product for full set (mL) to estimate material costs.

How the result changes with Desired total length (mm)

Desired total length (mm)Extension length (mm)
153
2816
4331
5543

What each input means

Nail bed width (mm)
Width of the natural nail bed at the widest point in millimeters.
Nail bed length (mm)
Length of the natural nail bed from cuticle to free edge.
Desired total length (mm)
Total desired nail length from cuticle to tip.
Nail shape
1 = square, 2 = round, 3 = oval, 4 = almond, 5 = coffin/ballerina, 6 = stiletto.
Application method
1 = tips with overlay, 2 = sculpted forms, 3 = dual forms, 4 = poly gel.

What each result means

Extension length (mm)
Length of the extension beyond the natural nail.
Estimated tip size (#)
Approximate tip size number (0 = largest, 10 = smallest).
Product per nail (mL)
Estimated gel or acrylic product needed per nail.
Product for full set (mL)
Total product needed for a 10-nail set including waste factor.
Breakage risk score
Risk of breakage (0 = very low, 100 = very high) based on length and shape.
Fill interval (weeks)
Recommended weeks between fill appointments.
Total nail area (mm²)
Combined surface area of nail bed plus extension.
Extension area (mm²)
Surface area of the extension portion only.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Nail bed width (mm) = 14, Nail bed length (mm) = 12, Desired total length (mm) = 25, Nail shape = 1 = 5 input(s) provided
  2. Calculate Extension length
    Extension length
    13 = 13
  3. Calculate Estimated tip size
    Estimated tip size
    6 = 6
  4. Calculate Product per nail
    Product per nail
    0.65 = 0.65

Engine last updated . Checked against 3 independently-derived tests — how we verify calculators.

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