Amazon Seller Calculator

What is an Amazon seller P&L?

A profit-and-loss statement for an Amazon seller is the full monthly accounting view of the business: revenue at the top, every operating cost line by line beneath it, and net profit at the bottom. It's the picture every accountant wants, every loan underwriter asks for, and every owner needs to make scaling decisions.

For an Amazon FBA business, the major lines are: gross revenue (units × price), Amazon platform costs (referral, FBA fulfillment, storage, return adjustments), product cost of goods sold, advertising (PPC + promo discounts), and operating expenses (software subscriptions, VAs and freelancers, payroll if you have employees, and third-party logistics costs for prep/inbound).

The bottom line — net profit — typically lands between 5% and 25% of revenue for a healthy private-label business. Below 5% is unsustainable in the long run because there's no buffer for inventory shortfalls or unexpected fee changes. Above 25% suggests an unusually defensible product or efficient operation worth doubling down on.

How to calculate Amazon seller net profit

Net profit is revenue minus the full cost stack. Spelled out:

Formula: Net = Revenue − Amazon fees − COGS − Ad spend − Software − Employee/VA − Logistics

Where Amazon fees combine referral (15% × revenue typically), FBA fulfillment ($4–10 × units depending on size), storage (per cubic foot × units), and an effective return cost (return rate × refund + fee retention). COGS is product cost × units. Software, employee/VA, and logistics are fixed-ish monthly costs that don't scale linearly with volume.

Worked example. A 5-SKU FBA seller does 500 units/month at $29.99 average. Revenue $14,995. Amazon fees per unit average $9.60 → $4,800. Product cost $8/unit → $4,000. Ad spend $2,200, software (Helium 10, PPC tool) $200/month, one part-time VA $600/month, 3PL prep cost $300/month. Net = $14,995 − $4,800 − $4,000 − $2,200 − $200 − $600 − $300 = $2,895/month (19.3% net margin).

The same revenue with poor opex discipline (full-time VA at $1,500, three software tools at $400, prep at $500): net drops to $1,495 — 10% margin. Same product, same volume, same fees — the difference is operational efficiency.

How to use this calculator

Pick your marketplace to auto-fill referral and FBA fees for the right currency. Enter average sale price across SKUs (weight by volume if SKUs differ a lot), monthly units sold, and product cost per unit (landed including inbound shipping).

Then layer in the operating costs that make this calculator distinct: ad spend (PPC plus any coupon/promo costs), software costs (Helium 10, Jungle Scout, AccountingHQ, PPC tools — anything billed monthly), employee/VA costs (salaries, contractors, freelancers), and logistics costs (3PL prep, inbound freight not in unit cost, removal fees). The calculator returns total Amazon fees, total operating costs, monthly net profit, and annual run-rate. Negative profits highlight red — a quick visual that opex is unsustainable.

Real-world examples

Example 1 — Solo side-hustle seller. 150 units/month at $24.99, $7 cost, $500 ads, $80 software (just Helium 10), no VA, no 3PL. Revenue $3,749. Amazon fees ~$1,290. COGS $1,050. Net = $3,749 − $1,290 − $1,050 − $500 − $80 = $829/month, 22% margin. Annual run-rate $9,948. Workable side income that supplements a day job but doesn't yet justify quitting.

Example 2 — Growing brand with VA. 800 units/month at $32.99, $9 cost, $2,800 ads, $250 software (multi-tool stack), $1,200 part-time VA, $400 3PL. Revenue $26,392. Amazon fees ~$9,000. COGS $7,200. Net = $26,392 − $9,000 − $7,200 − $2,800 − $250 − $1,200 − $400 = $5,542/month, 21% margin. Annual $66,504. The VA pays for themselves in time freed for product research — common pattern for sellers scaling SKUs 2 and 3.

Example 3 — Over-engineered small operation, near loss. 200 units/month at $19.99, $6 cost, $1,200 ads (over-spending vs revenue), $400 software (4 tools doing overlapping jobs), $1,500 full-time VA (too much for this volume), $200 3PL. Revenue $3,998. Amazon fees ~$1,300. COGS $1,200. Net = $3,998 − $1,300 − $1,200 − $1,200 − $400 − $1,500 − $200 = −$1,802/month. Loss-making — opex needs to drop 60% to break even at current volume, or volume needs to triple. Use this calculator to model both scenarios before deciding which to pursue.

Common mistakes and benchmarks

The most common opex mistake is hiring a full-time VA too early. A full-time VA at $1,200–$2,000/month requires roughly $50,000–$80,000 in annual revenue just to cover their cost at 30% gross margin. If you're not consistently above $8,000/month in revenue, start with project-based contractors instead.

Second is software stack creep. Many sellers accumulate Helium 10 + Jungle Scout + Keepa + a PPC tool + an accounting tool + an inventory tool, easily reaching $400/month. Most of these overlap; one or two well-chosen tools cover 90% of use cases.

Healthy benchmarks. Amazon fees: 30–38% of revenue for standard-size goods. COGS: 25–35%. Ad spend: 10–25% (over 30% is over-investing; under 5% is under-investing). Total opex (software + VAs + logistics): 3–8% of revenue. Net margin above 15%. Use the FBA Calculator for unit economics, and the Revenue Calculator for the lighter-weight projection view.