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Carpet Area Calculator

Carpet needed with waste. Free online Carpet Area Calculator. Calculate carpet area online — fast, accurate, mobile-friendly, no signup needed.

Sq yards
14.666667

Derivation

  1. ├── 01Givenl = 12, w = 10, waste = 10
  2. ├── 02Formulae.l × e.w / 9 × (1+e.waste / 100)
  3. ├── 03Substitutee.12 × e.10 / 9 × (1+e.10 / 100)
  4. └── 04Compute Sq yards14.666667
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§01What is

Understanding the Carpet Area Calculator

The Carpet Area Calculator computes Sq yards from 3 inputs: length (ft), width (ft), waste %. Carpet needed with waste.

On a construction site, estimates that come in 10% off add up to six-figure overruns. Running the quantities with a calculator instead of a rule-of-thumb gets you closer to the truth with zero extra effort. The Carpet Area Calculator sits in that toolkit — it carpet needed with waste. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02The Formula

How it’s calculated

e.l × e.w / 9 × (1+e.waste / 100)

Where

l
Length (ft)
w
Width (ft)
waste
Waste %
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: Length (ft) = 12, Width (ft) = 10, Waste % = 10.

  1. 01Start by noting the input — Length (ft): 12.
  2. 02Start by noting the input — Width (ft): 10.
  3. 03Start by noting the input — Waste %: 10.
  4. 04Substitute these values into the formula: e.l × e.w / 9 × (1+e.waste / 100)
  5. 05Compute Sq yards: the calculator returns 14.6667.
  6. 06Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants

Common Carpet Area Problems

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.

01 · PATTERN

Length (ft) halved

l = 6 (from 12)

Keep every other input at its default and halve the length (ft). See how sq yards responds.

  1. 01New Length (ft): 6
  2. 02Baseline Sq yards: 14.6667
  3. 03New Sq yards: 7.33333
  4. 04Sq yards decreases by 50% → use this sensitivity to plan for real-world variation.
02 · PATTERN

Length (ft) doubled

l = 24 (from 12)

Keep every other input at its default and double the length (ft). See how sq yards responds.

  1. 01New Length (ft): 24
  2. 02Baseline Sq yards: 14.6667
  3. 03New Sq yards: 29.3333
  4. 04Sq yards increases by 100% → use this sensitivity to plan for real-world variation.
03 · PATTERN

Width (ft) halved

w = 5 (from 10)

Keep every other input at its default and halve the width (ft). See how sq yards responds.

  1. 01New Width (ft): 5
  2. 02Baseline Sq yards: 14.6667
  3. 03New Sq yards: 7.33333
  4. 04Sq yards decreases by 50% → use this sensitivity to plan for real-world variation.
04 · PATTERN

Width (ft) doubled

w = 20 (from 10)

Keep every other input at its default and double the width (ft). See how sq yards responds.

  1. 01New Width (ft): 20
  2. 02Baseline Sq yards: 14.6667
  3. 03New Sq yards: 29.3333
  4. 04Sq yards increases by 100% → use this sensitivity to plan for real-world variation.
§05FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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