Observed arrival · 2026-09-27

SharpTally: 45 calculators for online sellers

sharptally.com Visit website

Editorial interest 78/100 Selection signal · not a rating of the site

A no-sign-up collection of calculators for marketplace fees, pricing, advertising, payments and unit economics.

Landing page captured for the 2026-09-27 issue.

For: Independent online marketplace sellers
Worth noticing: Its maintenance rule flags the build if any fee rate goes more than 400 days without review.

Field notes

The calculator index groups tools into marketplace fees, pricing and margin, ads and ROAS, customer economics, unit economics, payment fees, and inventory. The displayed Etsy example starts with a $31 order, subtracts $3.40 in fees, $8 in materials, and $5 in postage, and shows $14.61 kept. SharpTally says its calculators print their formulas and two worked examples, while its figures remain planning estimates.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

One card from the complete issue

Nostalgia for an Imaginary Console

276,168 arrived 1,000 judged 980 catalogued Enter the complete issue