Project guide
Paint Quantities for a Whole-Home Project
Keep the detail of each room while preparing a larger paint order.
Your measurements
Changing units changes the display, not the stored measurement.
Results
Example inputs
Your result will appear here
Enter the measurements and product details, then calculate.
These tools estimate material quantities from dimensions you choose. They do not specify structural depth or load capacity.
Measure rooms independently
Create one record per rectangular room. Enter its dimensions, selected walls or ceiling, measured wall openings, coat count and coverage. The current room model selects all four walls and/or the complete rectangular ceiling. A whole-home estimate should not begin with a single floor-area multiplier that hides wall heights and product differences.
Use clear room names and keep wall and ceiling products distinct where necessary. Check that a hallway, alcove or connecting room has not been counted twice.
Example: three wall areas
Consider net wall areas of 32 m², 27 m² and 20 m². These could be a bedroom, office and hallway after their individual openings have been deducted. Together they contain 79 m² of net wall area.
If all three use the same specified product, two user-selected coats and illustrative coverage of 10 m²/L, the requirement before allowance is 15.8 L. A chosen 10% allowance gives 17.38 L.
Round the shared purchase once
With a 2.5 L can, seven cans supply 17.5 L. The surplus beyond the adjusted requirement is 0.12 L. Keep the unrounded room requirements until grouping; separately rounded room cans can create a different order.
When a room uses another product, coverage or package specification, retain a separate purchase group. Do not force a match by changing a label while leaving the underlying parameters different.
Check one room at a time
Review each room’s opening deductions and surface selections before looking at the house total. An impossible opening area should be corrected locally. The final list should retain enough detail to trace every purchase group back to its rooms.
Coverage, coats and allowance remain project inputs. This method does not assess finish suitability or promise a result from a specific application technique.
Frequently asked questions
Can rooms with different products share one can total?
No. Keep different products and incompatible purchasing parameters in separate groups, even when all results use litres.
Sources and method
- PackLedge quantity methods
Original derivations using geometry, ratios, sums and whole-package rounding. Each calculator explains its assumptions and worked examples.
- Your selected product label or technical sheet
The source for the coverage, mixed yield, density, package capacity, sheet dimensions or wallpaper repeat that you enter.