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Professional Flooring Calculator
20.8 m²Measured area22.88 m²Order area11Packs check2.08 m²Waste area
Broadloom carpetMeasure the room first, then apply waste and supplier rounding.
5.2 x 4 mRoom footprint10%Waste allowance11 packsSupplier check
Supplier unit detailsBroadloom carpet
Measured = length x width + extraOrder = measured + wastePack check separate
Live math canvas
Your numbers, formula and explanation together
Flooring Calculator: 5.72 linear m. 5.2 m x 4 m + 0 m2 extra = 20.8 m2 measured; + 10% waste = 22.88 m2 order area; roll width 4 m; 11 pack(s) if ordering by 2.2 m2 packs.
Formula applied
The exact method behind this answer
CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.
Measured area = room length × room width + extra area. Order area = measured area × (1 + waste percent ÷ 100). Roll length = order area ÷ roll width. Plank count = order area ÷ (plank length × plank width). Tile count = order area ÷ (tile length × tile width). Packs = order area ÷ pack coverage, rounded up. Trade planner: minimum plank stagger = max(300 mm, board length ÷ 5 for boards at least 1500 mm, otherwise board length ÷ 4); roll drops = ceil(span ÷ roll width); SLC kilograms = area × fill depth in mm × 1.7 × 1.10.
Apply the formulaMeasured area = room length × room width + extra area. Order area = measured area × (1 + waste percent ÷ 100). Roll length = order area ÷ roll width. Plank count = order area ÷ (plank length × plank width). Tile count = order area ÷ (tile length × tile width). Packs = order area ÷ pack coverage, rounded up. Trade planner: minimum plank stagger = max(300 mm, board length ÷ 5 for boards at least 1500 mm, otherwise board length ÷ 4); roll drops = ceil(span ÷ roll width); SLC kilograms = area × fill depth in mm × 1.7 × 1.10.5.72 linear m5.2 m x 4 m + 0 m2 extra = 20.8 m2 measured; + 10% waste = 22.88 m2 order area; roll width 4 m; 11 pack(s) if ordering by 2.2 m2 packs.
Your live breakdown
Current inputs in the calculation
These values come from the controls above and update when the calculator changes.
Flooring type
Roll goods
Choose roll goods for carpet/vinyl, plank for boards, or tile for tile count.
Room length
5.2 m
Room width
4 m
Extra area
0 m²
Use for alcoves, hallways or second sections measured separately.
Waste
10 %
Roll width
4 m
Plank length
1.22 m
Plank width
0.18 m
Resulting answer
5.72 linear m
5.2 m x 4 m + 0 m2 extra = 20.8 m2 measured; + 10% waste = 22.88 m2 order area; roll width 4 m; 11 pack(s) if ordering by 2.2 m2 packs.
Answer
5.72 linear m
Live support
5.2 m x 4 m + 0 m2 extra = 20.8 m2 measured; + 10% waste = 22.88 m2 order area; roll width 4 m; 11 pack(s) if ordering by 2.2 m2 packs.
Assumptions used
What this answer assumes
Use the output as a planning quantity, then round using the actual supplier product label.
Room dimensions are treated as rectangular metric measurements.
Roll, plank, tile and pack outputs are planning estimates and should be checked against supplier coverage and installer rules.
The advanced trade planner includes planning allowances for trim, pattern repeat, natural stagger and self-levelling compound, but product instructions and installer inspection still decide the final order.
Master’s Tip
How to use the result well
Master’s Tip: do not let one final number hide the job story. Keep measured area, waste area, lay direction, natural stagger, product unit, roll/drop plan, substrate allowance and supplier rounding separate so a quote change can be audited in seconds.
Printable record
What belongs in the saved calculation
Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.
Flooring type
Roll goods
Choose roll goods for carpet/vinyl, plank for boards, or tile for tile count.
Room length
5.2 m
Room width
4 m
Extra area
0 m²
Use for alcoves, hallways or second sections measured separately.
Embeddable calculator
Embed this calculator
Copy a clean iframe version with the required CalculationTime attribution link built in.
Trade planner
Natural stagger, roll width, substrate and pack checks
This advanced layer keeps the order number honest by separating board geometry, offcut reuse, roll-drop layout and floor-prep risk from the simple area calculation above.
Natural stagger is 40 mm. Rule used: board length divided by 5, floored at 300 mm. Other direction gives 360 mm.
Last course is 10 mm. Click-lock rows keep the same reference wall; offcuts are checked against the previous three starts before reuse.
Row
Starter
New boards
Ender
Offcut
Flag
1
0 mm
4
40 mm
1780 mm to row 2
Ender below 150 mm
2
0 mm
4
40 mm
1780 mm to row 3
Ender below 150 mm; Starter clash inside 364 mm zone
3
0 mm
4
40 mm
1780 mm to row 4
Ender below 150 mm; Starter clash inside 364 mm zone
4
0 mm
4
40 mm
1780 mm to row 5
Ender below 150 mm; Starter clash inside 364 mm zone
5
0 mm
4
40 mm
1780 mm to row 6
Ender below 150 mm; Starter clash inside 364 mm zone
6
0 mm
4
40 mm
1780 mm to row 7
Ender below 150 mm; Starter clash inside 364 mm zone
7
0 mm
4
40 mm
1780 mm to row 8
Ender below 150 mm; Starter clash inside 364 mm zone
8
0 mm
4
40 mm
1780 mm to row 9
Ender below 150 mm; Starter clash inside 364 mm zone
9
0 mm
4
40 mm
1780 mm to row 10
Ender below 150 mm; Starter clash inside 364 mm zone
10
0 mm
4
40 mm
1780 mm to row 11
Ender below 150 mm; Starter clash inside 364 mm zone
Roll goods drop planner
27 m2floor area2drops1running joins9.66 mlinear order
Other direction would need 2 drops, 1 running joins and 12.2 m before waste.
Running join positions from the reference wall: 3.66 m. Check these against doorway locations before committing to this direction.
Loop pile normally wants running joins only and rib-cut edges where possible. Avoid cross joins in open areas; if a doorway forces one, keep it under the cover strip.
Floor preparation check
Spot grinding first, then re-check lowsassessment5SLC bags$275material$704labour allowance$979prep total
Use this as a planning allowance, not a site sign-off. Product tolerance, moisture, primer, curing time and substrate condition still need installer and manufacturer checks.
Explain it like I'm 12
Measure the floor like a rectangle first. Then add a waste percentage for cuts and mistakes. After that, translate the area into the thing you actually buy: metres from a roll, individual planks, tiles, or packs.
Why people use this calculator
Preparing a homeowner flooring estimate before asking suppliers for prices.
Checking whether a carpet, vinyl, LVT, engineered board or tile order looks reasonable.
Keeping measured area, waste allowance and pack rounding visible in a printable quote note.
Common mistakes
Buying from square metres alone when the product is sold by roll length or fixed pack coverage.
Mixing measured floor area with waste allowance so nobody can audit where the extra material came from.
Forgetting that supplier pack sizes, batch numbers, pattern repeats, stairs and trims can change the final order.
Formula
Measured area = room length × room width + extra area. Order area = measured area × (1 + waste percent ÷ 100). Roll length = order area ÷ roll width. Plank count = order area ÷ (plank length × plank width). Tile count = order area ÷ (tile length × tile width). Packs = order area ÷ pack coverage, rounded up. Trade planner: minimum plank stagger = max(300 mm, board length ÷ 5 for boards at least 1500 mm, otherwise board length ÷ 4); roll drops = ceil(span ÷ roll width); SLC kilograms = area × fill depth in mm × 1.7 × 1.10.
Worked example
A 5.2 m by 4.0 m room is 20.80 m². With 10% waste, order area is 22.88 m². On a 4 m roll, that is 5.72 linear metres before supplier rounding. If the same job is ordered from 2.2 m² packs, the pack check rounds to 11 packs. For long planks, the trade planner also checks starter/end-piece offsets against the minimum stagger rule instead of trusting area alone.
Professional note
Master’s Tip: do not let one final number hide the job story. Keep measured area, waste area, lay direction, natural stagger, product unit, roll/drop plan, substrate allowance and supplier rounding separate so a quote change can be audited in seconds.
Regional and unit assumptions
Metric trade worksheet using square metres, linear metres, board/tile area and pack coverage. Confirm the supplier pack label and installer allowance before ordering.
Assumptions and limitations
Room dimensions are treated as rectangular metric measurements.
Roll, plank, tile and pack outputs are planning estimates and should be checked against supplier coverage and installer rules.
The advanced trade planner includes planning allowances for trim, pattern repeat, natural stagger and self-levelling compound, but product instructions and installer inspection still decide the final order.
Methodology & Accuracy
How this calculator is checked
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Formula used
Measured area = room length × room width + extra area. Order area = measured area × (1 + waste percent ÷ 100). Roll length = order area ÷ roll width. Plank count = order area ÷ (plank length × plank width). Tile count = order area ÷ (tile length × tile width). Packs = order area ÷ pack coverage, rounded up. Trade planner: minimum plank stagger = max(300 mm, board length ÷ 5 for boards at least 1500 mm, otherwise board length ÷ 4); roll drops = ceil(span ÷ roll width); SLC kilograms = area × fill depth in mm × 1.7 × 1.10.
Standard or basis
Metric trade worksheet using square metres, linear metres, board/tile area and pack coverage. Confirm the supplier pack label and installer allowance before ordering.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.
Master's Tip
Master’s Tip: do not let one final number hide the job story. Keep measured area, waste area, lay direction, natural stagger, product unit, roll/drop plan, substrate allowance and supplier rounding separate so a quote change can be audited in seconds.
Related calculators
Next calculations from the same record
These cards are resolved from calculator data, category context and live-route status so the page links to useful next steps without hand-built link clutter.
Measure the room area, add a waste allowance, then round to the supplier's roll length, board count, tile count or pack coverage.
What waste percentage should I use?
Simple square rooms may use a lower allowance, while diagonal layouts, patterned products and awkward cuts usually need more. Check installer guidance.
Does this replace a professional quote?
No. It gives the arithmetic trail for a quote or supplier conversation; the installer still needs to confirm product, layout and site conditions.
Calculation note
Flooring quantities are often reused across sales, supplier and installer conversations. A good calculator keeps the measurement trail visible instead of hiding everything inside one final order number, and separates buying arithmetic from trade-layout warnings.