Free Reseller Tools & Profit Calculators

Financial Calculators

Calculate fees, profits, and break-even prices across platforms

34 tools in this category

Item Identifiers

Identify vintage items, decode tags, and assess value

8 tools in this category

Listing Utilities

Speed up listings with templates, converters, and generators

9 tools in this category

Shipping Tools

Optimize packaging, calculate rates, and avoid costly mistakes

6 tools in this category

Market Data

Research brands, track trends, and time your listings

5 tools in this category

Buyer Tools

Source smarter with checklists, comparisons, and timers

5 tools in this category

Which Platform Pays You Most: Fee Calculator 2026

Compare eBay, Mercari, Poshmark, Depop, Facebook, Grailed, and Etsy fees. See which platform gives you the highest net profit per flip.

StockX vs GOAT: Sneaker Payout Calculator 2026

See exact StockX vs GOAT payouts by seller level — fees, cash-out, and net profit compared. Free calculator included. Free calculator included.

PayPal G&S Fee Calculator 2026: 5 Currencies + Reverse Calc

Calculate your exact PayPal G&S fee before you accept payment. Covers 5 currencies with a reverse calculator for your target net. Free calculator included.

Break-Even Price Calculator 2026: Cover Costs & Labor

Calculate the exact minimum price needed to avoid losing money on resale flips. Accounts for platform fees, shipping, and the value of your time.

FBA Storage Fee Calculator 2026: 181-Day Penalty Rates

Check FBA storage costs before 181-day surcharges hit your margins. Monthly and peak-season rates — free calculator included. Free calculator included.

Depop 2026 Fee Calculator for US Sellers: Zero Fee

Calculate your exact Depop payout under the 2026 zero-fee model. US sellers pay only 3.3% + $0.45, far less than Poshmark's 20%. Free calculator included.

Reseller Rewards Card Calculator: Maximize ROI 2026

See how 2-5% credit card rewards lift your true reseller profit margin. Compare cards and calculate ROI on every sourcing run. Free calculator included.

eBay Promoted Listings ROI Calculator 2026

Enter your sale price, eBay fees, and ad rate (2–15%) to see if promoted listings grow your profit or just raise your costs. Free calculator included.

Reseller Tax Deduction Calculator 2026: After-COGS

Calculate your true taxable income after deducting COGS, platform fees, shipping, and supplies. Free calculator included.

Discount Stacking Calculator 2026: Retail Arbitrage

Calculate your true buy cost after stacking sales, coupons, cashback portals, and credit card rewards. Free calculator included.

Margin vs Markup Calculator 2026: Stop Underpricing

Margin and markup aren't the same — that 15-25% confusion costs you $1,000s. Convert in both directions, multipliers included. Free calculator included.

Reseller ROI Calculator 2026: True Net Per Flip

Calculate your real ROI, profit margin, and hourly rate per flip. Includes fees, shipping, and time. See if you hit 200%+ ROI. Free calculator included.

Whatnot Mistakes Costing You 15–30% Per Show (2026)

The 19 most common Whatnot seller mistakes with actionable fixes: pricing errors, poor camera setup, ignoring chat, slow shipping, no financial tracking, and more. Includes a pre-show checklist.

Your $500 Flip Month Is Really $180 After Fees 2026

Why that $500 sales month is really $180 in profit. Complete breakdown of 2026 platform fees (eBay, Poshmark, Mercari), actual shipping costs, packaging, sourcing expenses, and the hidden costs that kill margins. Includes real flip example with every cost tracked.

Mercari Shipping Guide: 5 Mistakes Killing Your Margin 2026

Complete Mercari shipping guide for resellers in 2026. Learn Mercari prepaid vs ship-on-your-own, weight tiers, dimensional risk, packaging systems, and profit-protecting shipping SOPs.