Calvex Lens / CSV lab

Bring the numbers
into focus.

Load a CSV. Check the costs. Change a number and see what moves. A small, working tool for understanding contribution across products and periods.

Enable JavaScript to import, edit and calculate. This page starts with fictional example data.

Paste CSV or check the format

Use one row per product and period. Amounts are USD totals, not per-unit prices. Enter net sales after refunds and non-negative costs. Up to 200 records / 1 MB.

period, product, sales, product_cost, fees, advertising

CSV text Download example CSV

Start with the example, edit an amount or import a CSV.

Input records · all periods

Edit any value. Results recalculate as you type.

Period	Product	Sales	Product cost	Fees & fulfillment	Advertising	×
2026-09	Trail Bottle	8400.00	2800.00	1700.00	900.00	—
2026-09	Desk Light	6200.00	2200.00	1300.00	900.00	—
2026-09	Canvas Pouch	3800.00	1200.00	750.00	450.00	—
2026-10	Trail Bottle	10200.00	3300.00	2000.00	1200.00	—
2026-10	Desk Light	7600.00	2700.00	1550.00	1050.00	—
2026-10	Canvas Pouch	4500.00	1300.00	850.00	500.00	—

Calculated results

All periods · example totals

Results for

Net sales$40,700.00From input records

Listed costs$26,650.00Products + fees + ads

Contribution$14,050.00Before overhead & taxes

Contribution / sales34.5%Not a net profit margin

Product	Sales	Costs	Contribution
Trail Bottle	$18,600.00	$11,900.00	$6,700.00
Desk Light	$13,800.00	$9,700.00	$4,100.00
Canvas Pouch	$8,300.00	$5,050.00	$3,250.00

Included toolsCSV import and export, editable records, validation, period filters and contribution calculations. The example products and amounts are fictional.

Your data stays hereCalculations run in your browser. Export your edited records to keep them; reloading resets the workspace.

Bring the numbersinto focus.

Input records · all periods

Calculated results

Bring the numbers
into focus.