Same $100 · locked hub formulas

$90.00 vs $90.00

Same KEEP on this $100 sale sketch (before COGS / monthly plan). Official first-paint from /facebook-marketplace-keep/ and /mercari-keep/.

Facebook KEEP
$90.00
Mercari KEEP
$90.00
Delta (Mercari − Facebook)
$0.00

Compare / Start Shopify — keep $96.80 on $100 (Basic Payments · Impact · FTC) · planning only · compare ranker · marketplaces compare

I get commissions for purchases made through links in this post. Compensated as a Shopify affiliate.

Official first-paint ONLY — rates locked to /facebook-marketplace-keep/ (#out $90.00) and /mercari-keep/ (#out $90.00). No invented referral %. Last verified 2026-09-18.

Last verified: 2026-09-18 · Locked hubs /facebook-marketplace-keep/ (#out $90.00) · /mercari-keep/ (#out $90.00) · planning only · Fee changes · live ranker

Facebook lock: shipped max(10%,$0.80) → KEEP = sale − max(0.10×sale, 0.80). Mercari lock: 10% → KEEP = sale − 0.10×sale.

Reverse / target KEEP · locked hub formulas

Target KEEP $ → required sale ( Facebook vs Mercari )

Enter the net you want after fees. We solve the sale each locked formula needs. Same algebra as /seller-fees/break-even/. No invented fees.

Facebook sale
—
Mercari sale
—

Reverse: Facebook sale = KEEP / 0.9 when fee is 10% · Mercari sale = KEEP / 0.9. Forward check on $100: both $90.00.

Facebook Marketplace vs Mercari fees calculator — keep $90.00 vs $90.00 on $100

Closet / social marketplace SERP pack: same sale on Facebook Marketplace and Mercari using only locked KEEP hubs — not a slogan, and not an invented referral row. On $100, both KEEP $90.00 (tie on processing keep). Board: marketplaces KEEP compare.

Not affiliated with Meta / Facebook Marketplace or Mercari. Shopify Impact links are disclosed affiliates. First-paint numbers match /facebook-marketplace-keep/ and /mercari-keep/ as of 2026-09-18. Confirm live rates on each platform. Planning only — not tax or legal advice.

Same-$100 KEEP compare (official locks)

PlatformOfficial starting fee (hub lock)KEEP on $100Hub
Facebook Marketplaceshipped checkout max(10%, $0.80)$90.00/facebook-marketplace-keep/
Mercari10% seller fee (post Jan 6 2025)$90.00/mercari-keep/

Winner on this $100 sketch: tie at $90.00 (processing keep — not traffic). Disclosed Shopify Impact affiliate under the card.

What each hub actually locks

Facebook Marketplace → KEEP $90.00 on $100

Formula on hub: KEEP = sale − max(0.10×sale, $0.80). Sources linked from Facebook Marketplace KEEP.

Mercari → KEEP $90.00 on $100

Formula on hub: KEEP = sale − 0.10×sale (buyer-paid shipping typed $0). Sources linked from Mercari KEEP.

When the gap moves (still official only)

FAQ

How much do you keep on $100 with Facebook Marketplace vs Mercari?

Facebook Marketplace KEEP $90.00 (shipped max(10%,$0.80)). Mercari KEEP $90.00 (10% seller fee). Same KEEP on this $100 sketch. Planning only.

Are these the same formulas as /facebook-marketplace-keep/ and /mercari-keep/?

Yes. First-paint only those locked official starting formulas. Facebook: KEEP = sale − max(0.10×sale, $0.80). Mercari: KEEP = sale − 0.10×sale (ship typed $0). No invented referral %.

Is monthly software inside KEEP?

No. Monthly plan / subscription opex is typed separately on hubs (default $0) and never baked into per-sale KEEP.

Is this affiliated with Facebook Marketplace, Mercari, or Shopify?

Not affiliated with Meta / Facebook Marketplace or Mercari. Shopify Impact links are disclosed affiliates (FTC). Educational planning only. Confirm live fees on each platform.

Keep $96.80 on Shopify — Start Shopify (Impact · FTC) Facebook KEEP hub Mercari KEEP hub Marketplaces compare

Related

Break-even list price Seller fee index Marketplaces KEEP compare TikTok Shop vs Shopify Whatnot vs eBay Mercari vs eBay Depop vs Mercari Facebook Marketplace KEEP $90 Mercari KEEP $90 Compare marketplaces