Planning tool
Calculators
Five transparent home-project calculators with formulas, worked examples, editable assumptions and clear limitations.
FixLume calculators are designed as transparent planning worksheets. Each tool shows the inputs behind the result and is paired with a worked example, formula and limitations so the page remains useful even if you prefer to calculate by hand.
Which calculator should you use?
| Your decision | Start with | What you still need to verify |
|---|---|---|
| How much wall surface is there? | Wall Area Calculator | Actual opening dimensions and whether your estimate should deduct them. |
| How much paint might the walls require? | Paint Calculator | The exact product coverage, number of coats and surface condition. |
| How many flooring cartons should I plan for? | Flooring Calculator | Product coverage per carton, room geometry and an appropriate cutting allowance. |
| How much baseboard or trim should I buy? | Trim Calculator | Which openings receive no trim, stock lengths and the joint/layout plan. |
| What cash ceiling should I set? | Project Budget Calculator | Local prices, rentals, disposal, taxes and which unknowns deserve contingency. |
Why the tools do not hide their assumptions
A single output can look precise even when an input is uncertain. FixLume therefore keeps coverage, waste, coats, stock length and contingency editable. The calculation is only as useful as those inputs. Product instructions, room conditions and local requirements can override a generic planning assumption.