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Flooring & Underlayment Calculator

Room dimensions + box sq ft → flooring boxes and underlayment rolls.

Where this fits

📦 Business & Seller OpsGoing 1099FreelancersFounders

This tool lives inside Going 1099 and is most useful for freelancers and founders.

Corp Tax Rate21%
SE Threshold$400
FICA Cap 2024$168,600

Room & Product

Flooring boxes
11
211 sq ft
Underlayment
3 rolls
100 sq ft/roll
Room area
192 sq ft
net
Waste
19 sq ft
10%
1

Room area

area = length × width

= 16 × 12

= 192 sq ft

2

Area with waste

total = area × (1 + waste%)

= 192 × (1 + 0.1)

= 211 sq ft (+19 sq ft waste)

10% waste accounts for cuts, pattern matching, and damaged pieces

3

Flooring boxes

boxes = ⌈totalSqFt ÷ sqFtPerBox⌉

= ⌈211 ÷ 20⌉

= 11 boxes

4

Underlayment rolls

rolls = ⌈totalSqFt ÷ rollSqFt⌉

= ⌈211 ÷ 100⌉

= 3 rolls

Underlayment is cut from the same area as flooring — same waste factor applies

Key insight

Plan 10% waste for straight lay, 15% for 45° diagonal, 15–20% for herringbone. Always buy from the same production lot — planks from different lots can have subtle color variation. Check the box sq ft on your specific product before ordering.

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