Financial Calculators

Financial Calculators for Resellers

Calculate fees, profits, and break-even prices across platforms. Compare options, open the live tools, and use Underpriced to make faster sourcing and pricing decisions.

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.

PayPal Fee Calculator 2026: G&S + International Rates

Calculate exact PayPal G&S fees in 5 currencies. US rate: 2.99% + $0.49. International: 4.49% + $0.49. 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.

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.

Sales Tax Calculator 2026: True COGS by State

Stop losing 8-10% on inventory. Calculate sales tax by state or learn how resale certificates eliminate tax on inventory purchases.

Vendoo vs Crosslist 2026: Best Crosslisting App

Compare Vendoo, Crosslist, and List Perfectly on fees, auto-delist, and real ROI — free calculator included.

Flip Profit & ROI Calculator 2026: Net Margin After Fees

Enter your buy price, platform, and shipping to see exact net profit, ROI, and margin for any flip — free calculator included.

Whatnot Fee Calculator 2026 [Free]: Seller Fees & Payout

Calculate exact Whatnot seller fees (9.5% + 2.9% + $0.30) and your net payout — built for resellers, not retailers. Free calculator included.

Offer Acceptance Calculator 2026: Accept, Counter, or Wait?

Data-driven tool to decide if you should accept an offer, counter, or wait. Free calculator included.

Tech Depreciation Calculator 2026: iPhone & Laptop Values

Calculate iPhone and MacBook resale values by condition. See depreciation rates to time your tech sales for maximum reseller profits.

Wholesale Profit Calculator 2026: Pallet ROI & Loss Rate

Calculate true wholesale and pallet margins — factoring 10–40% damage rates, unsellable items, and real per-unit costs. Free calculator included.

PSA/CGC Grading ROI Calculator 2026: Cards & Comics

Calculate if PSA, CGC, or BGS grading is worth the cost. Input raw card value, grading fees ($18-150), and see break-even grades. Free calculator included.

Return Rate Calculator 2026: True Margin After Returns

Calculate your true profit margin after factoring in return rates. See how a 5-15% return rate destroys margins. Free calculator included.

eBay Best Offer Calculator [Free]: Accept Thresholds

Set your eBay Best Offer auto-accept, decline, and counter thresholds to maximize profit — built for resellers, not retailers. Free calculator included.

Mileage Deduction Calculator 2026: IRS Tax Savings

Calculate tax savings from IRS standard mileage deduction (67¢/mile for 2024, 70¢ for 2025). Free calculator included.

Is Storage Worth It for Resellers: ROI Calculator 2026

Enter your unit cost and inventory value to see break-even monthly sales and whether adding storage actually helps your margins. Free calculator included.

6-Platform Fee Comparison 2026: Which Marketplace Wins?

Compare net profit across eBay, Mercari, Poshmark, Depop, FB Marketplace & Whatnot — so you keep more per flip. Free calculator included.

Auction vs Buy Now Calculator 2026: eBay Format Guide

See if auctioning or Buy It Now earns more per eBay listing. Input your price, time, and bidding odds — free calculator included.

Bundle Discount Optimizer 2026: Max Discount Calc

Calculate the maximum bundle discount you can offer while maintaining profit margins. See how shipping savings fund discounts. Free calculator included.

Inventory Turnover Calculator 2026: Sell-Through Rate

Calculate inventory turnover rate, sell-through percentage, and days of supply. Get an inventory health score with category benchmarks.

USPS Shipping Zone Calculator [Free]: ZIP Code Lookup

Free USPS shipping zone finder by ZIP. Covers Ground Advantage, Priority Mail, and First-Class. Free calculator included.

Cost Per Wear & Resale Calculator 2026: When to Sell

Calculate true cost-per-wear factoring in future resale value. See when holding vs selling maximizes value. Free calculator included.

Restock Alert Calculator 2026: Reorder Points & Safety

Calculate optimal reorder points and safety stock levels based on your sell-through rate and lead times. Never miss sales from stockouts.

Best Listing Time Calculator 2026: 7 Resale Sites

See peak buyer activity by hour across eBay, Poshmark, Mercari, Depop, and 3 more resale sites. Free heat map. Updated 2026. Free calculator included.

Negotiation Range Calculator: 3 Counter-Offer Zones

Set your price floor and get ready-to-send counter-offer scripts for every offer percentage, so you never undersell. Free calculator included.

Condition Grade Impact Calculator 2026: Price by Category

See how condition grades (Mint, Excellent, Good, Fair, Poor) affect resale prices by category. Includes repair ROI analysis - is fixing worth it?

Financial Calculators guides