RCRotoCurve
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Comparison calculators

Side-by-side calculators for fee, shipping, savings, and seller decisions.

RotoCurveeBay vs Mercari Fee Calculator

Compare sale price, fee rates, shipping cost, and item cost before choosing a marketplace.

RotoCurveEtsy vs Shopify Fee Calculator

Compare marketplace fees against store payment costs for the same product.

RotoCurveAmazon FBA vs FBM Calculator

Compare fulfillment fee assumptions, shipping cost, referral fees, and product margin.

RotoCurvePoshmark vs eBay Fee Calculator

Compare clothing resale fees and shipping discounts before listing.

RotoCurveStripe vs PayPal Fee Calculator

Compare payment processor fees and net payout for the same charge.

RotoCurveSquare vs Stripe Fee Calculator

Compare in-person or online processing fees for a sale.

RotoCurveFree Shipping vs Paid Shipping Calculator

Compare margin when shipping is built into price versus charged separately.

RotoCurveDiscount vs Cashback Calculator

Compare up-front coupons against delayed cashback or rewards.

RotoCurveBulk Buy vs Single Unit Calculator

Compare unit cost after bulk discounts, shipping, and expected use.

RotoCurveRent vs Buy Monthly Cost Calculator

Compare monthly housing cash flow with rent and ownership assumptions.

How to compare fairly

A fair comparison should use the same sale price, item cost, shipping plan, return assumption, payment method, and promotion budget on both sides. Otherwise the cheaper-looking option may only look better because an input was left out.

Use this page to narrow the decision, then verify current public fees and account-specific terms before changing platforms or pricing.

How to use this page well

Use this page as a planning aid, not a final quote or official rule. Replace defaults with your own numbers, compare more than one scenario, and check any important fee, tax, carrier, or marketplace policy against the official source before acting.