THE CLEVER NETWORKCleverDocuAVAILABLE NOWwww.cleverdocu.deCleverStudiIN DEVELOPMENTwww.cleverstudi.de
Translate pageChoose language
Back to all calculators

Home, building & household

Insulation calculator

Calculate insulation boards including waste.

Your result

Complete the fields and calculate.

Calculation method and formula

round up(Area to insulate [m²] × (1 + Waste [%] ÷ 100) ÷ (Board length [cm] ÷ 100 × Board width [cm] ÷ 100))

Understand the inputs

Area to insulate
Unit: m². Use a measured value or your own assumption.
Board length
Unit: cm. Use a measured value or your own assumption.
Board width
Unit: cm. Use a measured value or your own assumption.
Waste
Unit: %. Use a measured value or your own assumption.

Assumptions and limitations

The quantity includes your waste allowance and is rounded up to whole pieces or packs. Check layout, product dimensions, joints and return conditions before ordering.

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

Worked example

Illustrative values. Replace them with your own inputs for your calculation.

Area to insulate
95 m²
Board length
120 cm
Board width
60 cm
Waste
8 %
Example result143 boards

Guide value: materials, specifications and regional prices can vary.

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does Insulation calculator work?+

round up(Area to insulate [m²] × (1 + Waste [%] ÷ 100) ÷ (Board length [cm] ÷ 100 × Board width [cm] ÷ 100)). The quantity includes your waste allowance and is rounded up to whole pieces or packs. Check layout, product dimensions, joints and return conditions before ordering.

What assumptions should I consider for this result?+

The quantity includes your waste allowance and is rounded up to whole pieces or packs. Check layout, product dimensions, joints and return conditions before ordering. The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

How accurate is the result?+

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation. Prices, measurements and model assumptions determine how well the result represents your situation.

Is this calculator free?+

Yes. Calculations and PDF export work without an account or registration.

What happens to my inputs?+

Calculations run in your browser. Results are saved locally only when you add them to My results; favourites and history are also local. Shared links contain your values. The currency tool requests the selected currencies from its rate provider without sending your amount.

Toolbox

Related calculators

Home, building & household

Square metre calculator

Open

Home, building & household

Construction cost calculator

Open

Home, building & household

Renovation cost calculator

Open

Home, building & household

Tile calculator

Open
Related document on CleverDocuFree document templates and practical PDF tools – directly in your browser with no sign-up.