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Free Seller Tools

The daily math, done in seconds

Eleven free calculators for Amazon & marketplace sellers. No login, no account connection, no data leaves your browser — just the numbers you need to price, bid, and plan profitably.

Everything runs locally in your browser. Fee figures are estimates — always confirm in Seller Central for your category and marketplace.

FBA Profit & Margin Calculator

See net profit, margin, and ROI per unit after all your costs and Amazon fees.

$
$
%
Most categories 15%. Electronics ~8%, apparel ~17%.
$
Use the Fee Estimator tab if you don’t know it.
$
$
Per-unit result
—
net profit per unit
Profit margin—
Return on cost (ROI)—
Amazon fees (referral + FBA)—
Total cost per unit—
Break-even price—
Want this across your whole catalog?Get a free AI audit of margins & wasted spend.
Get a free audit

Break-even ACoS Calculator

The ACoS at which an advertised sale makes exactly zero profit — your ceiling before ads lose money.

$
$
COGS + referral + FBA + shipping (everything except ad spend).
Break-even ACoS
—
spend above this loses money on the advertised sale
Pre-ad profit per unit—
Equivalent break-even ROAS—
Know your ceiling on every SKU automatically.SellerGeni holds spend to your profit line.
Get a free audit

Target ACoS Calculator

Work backward from the profit you want to keep to the ACoS you should run to.

%
From the Break-even ACoS tab.
%
Target ACoS
—
run ads to this to keep your target profit
Target ROAS—
Profit headroom used—
Set targets once. Let AI hit them daily.Automated bidding to your ACoS goal.
Get a free audit

Max CPC Bid Calculator

The highest click bid you can place and still hit your target ACoS.

$
%
Orders ÷ clicks. Amazon average is often 8–12%.
%
Maximum profitable bid
—
highest CPC that still hits your target ACoS
Revenue per click—
Break-even bid (0% profit)—
Bidding this by hand across thousands of keywords?Let AI set every bid, every day.
Get a free audit

ACoS ⇄ ROAS Converter

Two sides of the same coin. Type in either — the other updates instantly.

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×
Quick reference
See ACoS, ROAS & TACoS on one live dashboard.Free to explore your own account.
Get a free audit

Amazon Fee Estimator

Estimate referral + FBA fulfillment fees before you launch a product. US rate card, 2025–26.

$
oz
Shipping weight of the packed unit.
Estimated fees
—
total Amazon fees per unit (estimate)
Referral fee—
FBA fulfillment fee—
Fees as % of price—
Estimate only — confirm live rates in Seller Central.
Fees eating your margin?Find the leaks with a free audit.
Get a free audit

Pricing / Margin Calculator

Set the margin you want to keep, get the price you need to list at.

$
COGS + fees + fulfillment + shipping.
%
Recommended list price
—
to keep your target margin
Profit per unit—
Markup on cost—
Price with confidence at scale.Free audit of your catalog’s margins.
Get a free audit

Listing Optimizer Checker

Paste your title and bullets to check length limits, keyword coverage, and common red flags.

Listing health
—
quick checks passed
    Want listings AI-tuned for Rufus & search?See what a free audit surfaces.
    Get a free audit

    Inventory Reorder Point Calculator

    Know the exact stock level at which to place your next PO so you never stock out mid-campaign.

    days
    days
    Reorder when stock hits
    —
    units — place your PO at this level
    Days of cover left now—
    Reorder in about—
    Stockouts kill your rank and your ads.Keep spend in sync with stock — free audit.
    Get a free audit

    Coupon / Deal Profit Impact

    See what a discount does to your margin — and whether the promo still makes money.

    $
    $
    %
    Profit per unit during promo
    —
    after the discount
    Promo price—
    Margin during promo—
    Deepest discount before $0 profit—
    Plan promos that actually protect profit.Free audit of deal & ad overlap.
    Get a free audit

    Review Velocity Calculator

    Estimate how long it takes to reach your next review milestone at your current sales pace.

    %
    Reviews ÷ orders. Organic is often 1–2%.
    Time to reach target
    —
    at your current pace
    New reviews per week—
    Reviews still needed—
    Projected reviews in 90 days—
    More sales, more reviews, compounding.Grow velocity with a free audit.
    Get a free audit
    These tools are provided free by SellerGeni for planning and estimation. Fee figures reflect typical US Amazon rate cards and vary by category, size, season, and marketplace — always verify current fees in Seller Central before making decisions. Nothing here is financial advice.