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Aluminum profile linear meters calculator for windows

Calculate exactly how many linear meters of aluminum profile you need for any window type — sliding, fixed, or casement. Includes frame, panels, contraframe, and waste. Shows how many 6-meter bars to buy.

🗓️ Updated June 2026 Reviewed by
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This calculator estimates the total linear meters of aluminum profile needed to build or replace a window, accounting for the outer frame, each sliding panel (which carries its own perimeter of profile), an optional contraframe embedded in the masonry, any intermediate horizontal transoms, and a cutting waste factor. The formula is ML_total = [P_frame + Σ P_panels + P_contraframe + transoms] × (1 + waste/100), converted to the number of standard 6-meter commercial bars to purchase.

When to use this calculator

  • Estimating aluminum profile for all the sliding windows in a new apartment before placing a bulk order with a supplier.
  • Calculating total bars of 6-meter extrusion needed when replacing windows of different sizes in a home renovation, to buy everything in a single trip.
  • Planning the profile for balcony enclosures with fixed panes and projected panels, including the contraframe embedded in the concrete slab.
  • Cross-checking a contractor's material quote against your own calculation to detect over-billing on a commercial glazing project.

Linear Meters of Aluminum Profile by Window Type (Reference Values)

Window typeSize (m)Net MLWith 10% waste6-m bars to buy
Small fixed pane0.60 × 0.602.40 m2.64 m1
Medium fixed pane1.00 × 1.204.40 m4.84 m1
Single-panel slider (bathroom)0.60 × 0.805.72 m6.29 m2
2-panel slider (bedroom)1.20 × 1.0010.92 m12.01 m3
2-panel slider (living room)1.80 × 1.2015.72 m17.29 m3
2-panel patio door2.00 × 2.1020.52 m22.57 m4
3-panel balcony enclosure2.40 × 2.2026.84 m29.52 m5
2-panel slider + contraframe1.20 × 1.0015.32 m16.85 m3

Fuente: EXA Aluminio – Catálogo Técnico Corredizas A40; Aluminio Fácilito – formulas de corte de perfiles (2026). Formula applied: ML_total = [P_frame + Σ P_panels + P_contraframe + transoms] × (1 + waste/100). Bars = CEILING(ML_total / 6). A 10% waste factor is the recognized industry minimum for miter cuts and offcuts.

How it works

How It Is Calculated

The calculator adds up the linear meters of aluminum profile that form each component of the window:

1. Outer frame (always present):
   P_frame = 2 × (width + height)

2. Each sliding panel (if any):
   panel_width ≈ (window_width / number_of_panels) + 0.03 m  ← 3 cm overlap between panels
   P_panel = 2 × (panel_width + height)
   Panel subtotal = P_panel × number_of_panels

3. Contraframe (if selected):
   P_contraframe = 2 × (width + height)   ← same perimeter as outer frame

4. Intermediate horizontal transom (if selected):
   T = window_width

5. Net total:
   ML_net = P_frame + panel_subtotal + P_contraframe + T

6. Total with waste factor:
   ML_total = ML_net × (1 + waste_pct / 100)

7. Commercial bars to purchase (6 m standard length):
   Bars = CEILING(ML_total / 6)

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Reference Table: Linear Meters by Window Type

Window typeSize (m)Net MLWith 10% waste6-m bars
Small fixed pane0.60 × 0.602.40 m2.64 m1 bar
Medium fixed pane1.00 × 1.204.40 m4.84 m1 bar
Single-panel slider (bathroom)0.60 × 0.805.72 m6.29 m2 bars
2-panel slider (bedroom)1.20 × 1.0010.92 m12.01 m3 bars
2-panel slider (living room)1.80 × 1.2015.72 m17.29 m3 bars
2-panel patio door2.00 × 2.1020.52 m22.57 m4 bars
3-panel balcony enclosure2.40 × 2.2026.84 m29.52 m5 bars
2-panel slider + contraframe1.20 × 1.0015.32 m16.85 m3 bars

Net totals before waste allowance. Add 10–15% for actual purchase.

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Common Mistakes

1. Forgetting the sliding panel perimeters — the outer frame is only part of the material; each sliding panel carries its own complete frame of profile (60–70% of the total in a 2-panel window).
2. Ignoring the 3 cm overlap between panels — sliding panels overlap each other by ~3 cm so the track seals properly. Omitting this means each panel is ~3 cm short of profile.
3. Not adding the contraframe — in new construction the contraframe is embedded in the masonry before plastering and represents a full additional perimeter per opening.
4. Skipping the waste factor — miter cuts at corners, end-trims, and damaged extrusion tips all produce offcuts; a 10% buffer is the recognized industry minimum.
5. Mixing millimeters and meters — always convert all dimensions to the same unit before calculating; using 1200 mm for width and 1.00 for height gives a result 1000× too large.

Standard 2-panel sliding window 1.20 m × 1.00 m — no contraframe, 10% waste

Outer frame: 2 × (1.20 + 1.00) = 4.40 m
Panel 1: width ≈ 0.63 m; P_panel = 2 × (0.63 + 1.00) = 3.26 m
Panel 2: same as panel 1 = 3.26 m → panels total: 6.52 m
Net total: 4.40 + 6.52 = 10.92 m
10% waste: 10.92 × 1.10 = 12.01 m → 3 bars of 6 m
12.01 linear meters — 3 bars of 6 m

Frequently asked questions

How many linear meters of aluminum profile does a 1.20 m × 1.00 m sliding window need?
A standard 2-panel slider at 1.20 m × 1.00 m needs 12.01 linear meters of aluminum profile with 10% waste included (3 bars of 6 m). Breakdown: outer frame 4.40 m + 2 sliding panels 6.52 m = 10.92 m net × 1.10 = 12.01 m.
What is the correct formula for aluminum profile linear meters in a window?
ML_total = [P_frame + (P_per_panel × number_of_panels) + P_contraframe + transoms] × (1 + waste%). For a frame: P = 2×(width+height). For each sliding panel: P = 2×(panel_width+height), where panel_width ≈ window_width/panels + 3 cm overlap. Add 10% waste for straight cuts, 15% for mitered joints.
Why do the sliding panels add so many extra meters of profile?
Each sliding panel has its own complete rectangular frame of profile: two vertical stiles (height × 2) and two horizontal rails (panel width × 2). In a standard 2-panel slider, the panels alone can account for 60–70% of the total linear meters. Calculating only the outer perimeter is the single most common mistake when estimating aluminum for windows.
What waste percentage should I use for aluminum window profile?
Use 10% for windows with straight 90° cuts (the most common case). Use 15% if the frames use mitered 45° corners, or if the opening is non-rectangular (arched, trapezoidal). Leftover profile is never wasted — it serves as spare material for future repairs without needing to buy a full 6-meter bar.
What is the standard commercial length of aluminum extrusion bars?
6.0 meters is the standard in Argentina, Chile, Mexico, and most of Latin America. Some specialized suppliers offer 3-meter bars at a roughly 15–20% price premium per linear meter. In the United States, 12-foot (3.66 m) and 20-foot (6.10 m) stock lengths are common per ASTM B221.
What is a contraframe and do I need one?
A contraframe (contramarco in Spanish) is a profile perimeter embedded in the masonry before plastering; it acts as the anchor for the main window frame. In new construction it is almost always required. In window replacements where the original contraframe is already in place, you typically only buy the new inner frame and panels. If in doubt, check with your installer — an omitted contraframe can mean the window frame has nothing structural to fix to.
Does this formula work for casement (side-hinged) windows too?
Yes. For a casement window, treat each hinged leaf exactly like a sliding panel in this calculator: it has its own perimeter of profile. The only structural difference is that casement leaves are wider (full window width for a single casement) and use different hardware. The linear-meter calculation method is identical.
How do I calculate the profile for several windows of different sizes in a renovation?
Run the calculator separately for each window, note the total ML with waste for each one, sum all of them, then divide by 6 and round up. For example, three windows at 12.01 m, 8.40 m, and 5.28 m: total = 25.69 m → ⌈25.69/6⌉ = 5 bars (30 m, ~4.31 m surplus for future use).
What aluminum alloy is used for window frames, and does it affect the calculation?
The most common alloy for architectural profiles is 6063-T5 or 6063-T6 (aluminum–magnesium–silicon), which combines excellent extrudability with corrosion resistance per ASTM B221. The alloy does not change the linear-meter calculation — it only affects weight (≈0.8–1.5 kg/m depending on profile series) and unit cost. A thermally broken (RPT) profile is measured exactly the same way but typically costs 30–50% more per linear meter.
Does the calculation change for windows with a thermal break (RPT)?
No — the linear meter count is identical. Thermally broken profiles incorporate a polyamide barrier between the two aluminum faces, which improves thermal and acoustic insulation but does not change the profile geometry. The difference is unit cost only: RPT profiles typically cost 30–50% more per linear meter, making accurate calculation even more important to avoid over-ordering.

Methodology & trust

Editorial

Calculadora de construcción revisada por el equipo editorial de Hacé Cuentas, contrastada con ASTM B221 – Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes, según nuestra política editorial y metodología.

Updates

Última revisión: June 20, 2026. Los parámetros se verifican periódicamente con las fuentes citadas.

Privacy

Calculations run 100% in your browser. We do not store or transmit your data.

Limitations

Indicative results. For critical decisions, consult a professional.

📌 How to cite this calculator

Rodríguez, M. (2026). Aluminum profile linear meters calculator for windows. Hacé Cuentas. https://hacecuentas.com/aluminum-profile-linear-meters-window

Contenido bajo licencia CC-BY 4.0 — reutilizable citando la fuente con enlace a Hacé Cuentas.

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