Profit Calculators
Six calculators for online sellers. Every number runs in your browser — nothing is uploaded or stored.
FBA Reimbursement Calculator
Estimate the lost, damaged and returned inventory claims Amazon may owe you.
Calculate →Shopify Profit Calculator
True per-order profit on your Shopify plan: processing fees, gateway penalty, COGS, shipping and ads.
Calculate →Shopify Fee Calculator
What Shopify really takes per sale: processing, gateway penalty, subscription and extra fees.
Calculate →ROAS & Breakeven Calculator
ROAS, CPA and your breakeven ROAS floor from real margins.
Calculate →Customer LTV Calculator
Margin-basis lifetime value and LTV:CAC verdict against the 3:1 rule.
Calculate →E-commerce Price Calculator
Work backwards from target margin to the price you should charge.
Calculate →Dropshipping Profit Calculator
Real expected profit per order after ads, fees and refunds.
Calculate →Amazon FBA Fee Calculator
Referral, fulfillment, storage and inbound placement on the 2026 US rate card, published as open data. Runs at ylishi.tools.
Open at ylishi.tools →Selling on Amazon? The referral, fulfillment, storage and inbound placement rates behind these models are published as open data at ylishi.tools/rates, with a per-sale FBA fee calculator built on top of them.
Other free tools
Need quick text or developer utilities? Try the word counter, JSON formatter, case converter or password generator.
Gear that shows up in these calculations
Thermal label printer
4x6 carrier labels printed without ink or toner.
See prices on Amazon →Digital shipping scale
Weigh parcels to the gram before you buy postage.
See prices on Amazon →Self-seal poly mailers
Padded, waterproof mailers priced per unit in bulk.
See prices on Amazon →Packing tape gun
Seal every box in one pass instead of three.
See prices on Amazon →As an Amazon Associate we earn from qualifying purchases through these links. The price you pay is the same either way.