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Every calculator, comparison and page on SharpTally.

Marketplace fees

Amazon FBA Fee Calculator Referral fee with its $0.30 minimum, the fulfilment fee from the weight table, and storage billed per month.
Depop Fee Calculator Depop scrapped the 10% selling fee for US sellers, but 3.3% + $0.45 processing stayed.
eBay Fee Calculator See exactly what eBay takes from a sale.
eBay Profit Calculator Enter price, shipping, cost and your Promoted Listings rate to see real eBay profit, the total eBay takes, your margin and the break-even sale price.
Etsy Fee Calculator Etsy charges four separate fees, and two of them apply to shipping.
Etsy Profit Calculator Price, fees, materials, postage, ads and your own labour in one number.
FBA Calculator Referral, fulfilment and storage fees plus the three costs Amazon leaves out: inbound freight, PPC and landed cost.
FBA Revenue Calculator Net proceeds after referral and fulfilment fees, then the cost returns add back in.
Mercari Fee Calculator Mercari takes 10% of the item price plus buyer-paid shipping, and no processing fee since January 2025.
Poshmark Fee Calculator Poshmark charges a flat $2.95 under $15 and 20% at $15 and above.
Shopify Fee Calculator Shopify takes no commission, so the real cost is the plan divided by your order count plus card processing.
TikTok Shop Fee Calculator TikTok Shop's referral fee is only part of the cost.
Whatnot Fee Calculator Whatnot takes 8% commission plus 2.9% + $0.30 processing.

Gross Margin Calculator Work out gross margin from revenue and cost of goods sold.
Margin vs Markup Calculator Enter a margin to get the markup that produces it, or a markup to get its margin.
Markup Calculator Turn a cost and a markup percentage into a selling price.
MSRP Calculator Build an MSRP from manufacturing cost through wholesale in two markup stages.
Profit Margin Calculator Enter revenue, cost of goods and operating costs to get gross margin, net margin and profit in dollars.
Retail Price Calculator Start with the margin you need and work backwards to the price.
Retail Profit Margin Calculator Per-unit retail margin after markdowns and shrinkage.
Shopify Profit Margin Calculator Subtract Shopify Payments processing and your monthly plan, spread over your order volume, to see the real margin and monthly profit on a product.

Break-Even ROAS Calculator Turn a gross margin percentage into the exact ROAS a campaign must hit to stop losing money, plus the target ROAS for the net margin you want.
Conversion Rate Calculator Divide conversions by sessions for conversion rate, then revenue per session, the number that decides which of two stores is actually earning more.
CPA Calculator Work out cost per acquisition from spend and conversions, then the maximum CPA your gross margin can actually afford before orders sell at a loss.
CPC Calculator Divide ad spend by clicks for average CPC, then find the maximum CPC your conversion rate and target CPA can support before a keyword loses money.
CPM Calculator Solve CPM, ad spend or impressions from the other two.
CTR Calculator Divide clicks by impressions for click-through rate, with the CPC and CPM the same numbers imply and benchmarks for search, social and display.
ROAS Calculator Work out return on ad spend, then the profit-adjusted ROAS that counts your COGS.
TACOS Calculator Divide ad spend by total revenue, organic included, to get TACOS.

AOV Calculator Divide revenue by orders to get average order value.
CAC Calculator Divide sales and marketing spend by new customers to get CAC.
Churn Rate Calculator Calculate monthly or annual churn from customers lost and customers started with.
LTV Calculator Work out customer lifetime value from AOV, purchase frequency and lifespan, then see the gross-margin-adjusted LTV that CAC is measured against.
MRR and ARR Calculator Calculate MRR from customers and ARPU, turn it into ARR, and track net new MRR from new, expansion and churned revenue.

Break Even Calculator Divide fixed costs by contribution per unit to find the break-even point in units and in revenue.
COGS Calculator Opening inventory plus purchases minus closing inventory gives COGS.
Contribution Margin Calculator Price minus variable cost gives contribution margin per unit and as a ratio.
Landed Cost Calculator Add freight, duty, insurance and handling to your unit price to get true landed cost per unit and per shipment.

eBay and PayPal Fee Calculator Paying eBay and PayPal on the same sale costs 17.09% plus $0.89 in flat fees.
PayPal Fee Calculator PayPal Checkout and invoices cost 3.49% + $0.49 in the US; Goods and Services is 2.99%.
PayPal Goods and Services Fee Calculator PayPal Goods and Services costs 2.99% with no fixed fee, plus 1.5% when the buyer is abroad.
Square Fee Calculator Square charges 2.6% + 15¢ in person, 3.3% + 30¢ online and 3.5% + 15¢ keyed on the free plan.
Stripe Fee Calculator Stripe charges 2.9% + $0.30 domestically, with 1.5% added for foreign cards.

EOQ Calculator Find the order size where ordering cost and holding cost balance out.
Inventory Turnover Calculator Divide COGS by average inventory to get turns per year.