Calculator: inputs + live breakdown + net profit sync

What you’ll learn

How the Calculator is structured, what each side shows, and how changes sync back to the Net Profit you see in the Master List.

The Calculator card layout

Each product has a Calculator “card” with two equal sections:

1) Inputs (left)

This is where you enter your numbers.

Inputs are left-aligned (numbers don’t center)
The focus stays active while typing (no unwanted blur)

2) Live breakdown (right)

This panel updates live and shows your profitability breakdown.

Think of it as your “instant unit economics dashboard” for that product.

What goes into Inputs (left side)

The exact input rows depend on your setup, but they generally fall into these groups:

Selling

Selling price

Product costs

Unit cost
Packaging / inserts (if applicable)

Logistics

Shipping / landed cost per unit (if you include it)

Marketplace / fulfilment fees

Platform fees
Fulfilment fees
Payment fees (if applicable)

Marketing

Ad / promo cost per unit (recommended for realistic profit)

Tip: If you don’t know a number yet, start with an estimate and refine later.

What the Live breakdown shows (right side)

The breakdown panel is the “output” side. It updates based on your inputs and typically shows:

Total cost per unit
Net profit
Net margin

This is the number you use to decide if the idea is worth moving forward.

Net profit sync (Calculator → Master List)

What sync means

When you update and save your Calculator inputs, D2C Lab updates:

the Calculator breakdown, and
the Net Profit shown in the Master List for that product.

Why this matters

Master List is for comparing ideas quickly — so Net Profit needs to stay synced.

How to make sure Net Profit updates

Update your inputs
Ensure the changes are saved
Go back to Master List and confirm the Net Profit value

If you don’t see it immediately:

refresh once
then check again

Common workflow (how people use this)

Start with a rough selling price
Add a realistic unit cost estimate
Add basic fees and a small marketing cost
Check the live breakdown
Adjust price/cost assumptions until the idea makes sense
Use Master List net profit to shortlist the best ideas

Troubleshooting

Net Profit is not syncing to Master List

Confirm you saved the calculator changes
Refresh once
If it still doesn’t update, use the troubleshooting article:
Fix: Net profit not updating in Master List

Model profitability (Calculator)
Where your numbers come from (quick overview)
What counts as cost? (quick definitions)
Fix: Net profit not updating in Master List