# SellMath

> Free, browser-only calculators for platform fees, selling prices, profit and advertising, with no signup.

## English

- [Stripe Fee Calculator](https://sellmath.app/stripe-fee-calculator/): Calculate Stripe US card fees, net payout, and the price needed to receive your target amount.
- [PayPal Fee Calculator](https://sellmath.app/paypal-fee-calculator/): Estimate PayPal US fees by payment type, compare platforms, and reverse-calculate your selling price.
- [eBay Fee Calculator 2026 — Selling Fees](https://sellmath.app/ebay-fee-calculator/): Use this eBay calculator for US fees and payout, then enter your costs to estimate profit or work backwards to a listing price.
- [Etsy Fee Calculator](https://sellmath.app/etsy-fee-calculator/): Estimate Etsy US listing, transaction and payment fees, then find a selling price that meets your profit target.
- [Depop Fee Calculator — US & UK](https://sellmath.app/depop-fee-calculator/): Use this Depop calculator to estimate US or UK processing, optional boosting and profit, or work back from the amount you want to keep.
- [Mercari US Fee Calculator](https://sellmath.app/mercari-fee-calculator/): Use this Mercari calculator for US seller fees, payout and profit after costs, or find the listing price needed for your target.
- [Poshmark Fee Calculator](https://sellmath.app/poshmark-fee-calculator/): Use this Poshmark calculator to estimate US seller fees and profit, or find a listing price that reaches your target payout.
- [Mercari Japan Fee Calculator](https://sellmath.app/mercari-jp-fee-calculator/): Estimate Mercari Japan selling fees in yen, select a shipping method, and reverse-calculate a listing price.
- [Markup and Margin Calculator](https://sellmath.app/markup-calculator/): Calculate markup, gross margin and gross profit from your item cost and selling price.
- [ROI Calculator](https://sellmath.app/roi-calculator/): Calculate return on investment from total proceeds and the initial investment cost.
- [ROAS Calculator](https://sellmath.app/roas-calculator/): Calculate return on ad spend as a multiple and a percentage from attributed revenue and advertising spend.
- [CPC Calculator](https://sellmath.app/cpc-calculator/): Calculate your average cost per click from advertising spend and clicks.
- [CPM Calculator](https://sellmath.app/cpm-calculator/): Calculate advertising cost per thousand impressions.
- [CTR Calculator](https://sellmath.app/ctr-calculator/): Calculate click-through rate from clicks and impressions.
- [Break-even ROAS Calculator](https://sellmath.app/break-even-roas-calculator/): Find the ROAS and acquisition cost needed to break even after product costs, shipping and selling fees.
- [eBay vs Etsy Fees](https://sellmath.app/ebay-vs-etsy/): Compare eBay and Etsy fees at the same selling price and find the price needed to reach a target payout.
- [Depop vs Poshmark Fees](https://sellmath.app/depop-vs-poshmark/): Compare Depop US and Poshmark US selling fees, payouts and target listing prices.
- [Mercari vs Poshmark Fees](https://sellmath.app/mercari-vs-poshmark/): Compare Mercari US and Poshmark US fees for a sale and reverse-calculate the price needed for your target.
- [Grailed Fee Calculator](https://sellmath.app/grailed-fee-calculator/): Use this Grailed fees calculator to estimate commission, Stripe processing, total fees and net payout, or find a price for your target payout.
- [Reverb Fee Calculator](https://sellmath.app/reverb-fee-calculator/): Calculate Reverb fees and net payout in USD with this Reverb fees calculator, or use reverse mode as a Reverb price calculator for a target payout.
- [Whatnot Fees Calculator — Seller Payout](https://sellmath.app/whatnot-fee-calculator/): Use this Whatnot calculator to estimate US commission, processing and profit by category and sales tier, or price for a target payout.
- [PayPal Goods and Services Fee Calculator](https://sellmath.app/paypal-goods-and-services-fee-calculator/): Calculate US PayPal G&S seller fees and reverse the price to ask for your desired net payment.
- [PayPal Friends and Family Fee Calculator](https://sellmath.app/paypal-friends-and-family-fee-calculator/): Estimate US PayPal personal transfer fees by funding source, international minimum and cap, and an optional currency spread.
- [PayPal Invoice Fee Calculator](https://sellmath.app/paypal-invoice-fee-calculator/): Calculate US PayPal invoice fees by payment method, including capped ACH, and invoice enough to meet your net target.
- [PayPal Fee Calculator UK (GBP)](https://sellmath.app/paypal-fee-calculator-uk/): PayPal fee calculator UK: estimate commercial charges in GBP, include international surcharges and calculate the amount to ask for to receive your target.
- [PayPal Fee Calculator Australia (AUD)](https://sellmath.app/paypal-fee-calculator-australia/): Estimate Australia PayPal commercial fees in AUD, select the sender market, and reverse-calculate a target payout.
- [PayPal Fee Calculator Canada (CAD)](https://sellmath.app/paypal-fee-calculator-canada/): Estimate Canada PayPal commercial fees in CAD, select the sender market, and reverse-calculate a target payout.
- [eBay Profit Calculator 2026 — Costs & Ads](https://sellmath.app/ebay-profit-calculator/): A profit calculator eBay sellers can use to account for item, shipping, packaging and advertising costs before listing. Uses the US fee schedule.
- [eBay Fee Calculator UK — Private & Business](https://sellmath.app/ebay-uk-fee-calculator/): eBay fees calculator UK for private and business sellers: estimate fees, profit and buyer totals in GBP, or reverse-calculate a target price.
- [Free Fee, Profit and Advertising Calculators](https://sellmath.app/): Free calculators for selling, pricing and advertising. Clear assumptions, local calculations, and no account required.
- [AI Info: SellMath Sources and Citations](https://sellmath.app/ai-info/): Get to know SellMath, find verified fee sources and calculator pages, and learn how to cite a dated fee estimate.
- [Fee Changes and Verification Log](https://sellmath.app/fee-changes/): Dated changes to SellMath fee assumptions, with official sources and verification status.
- [About SellMath and Fee Assumptions](https://sellmath.app/about/): Learn how SellMath calculates fees, payout and profit, and how to read regional assumptions and verification status.
- [Privacy Policy](https://sellmath.app/privacy/): Learn how SellMath handles calculator inputs, browser storage and requests to its static host.
- [Terms of Use](https://sellmath.app/terms/): Read the terms for using SellMath, including calculation estimates, availability and independent platform references.

## Deutsch

- [PayPal Gebührenrechner & PayPal Rechner – privat/gewerblich](https://sellmath.app/de/paypal-gebuehren-rechner/): Mit diesem PayPal Rechner Gebühren für private und gewerbliche Konten in EUR berechnen, Käuferregion wählen und den Verkaufspreis für Ihre Wunschauszahlung finden.
- [eBay-Gebühren-Rechner](https://sellmath.app/de/ebay-gebuehren-rechner/): eBay.de-Gebühren für private und gewerbliche Verkäufe schätzen und den benötigten Verkaufspreis rückwärts berechnen.
- [Etsy-Gebühren-Rechner](https://sellmath.app/de/etsy-gebuehren-rechner/): Etsy-Gebühren in Euro für einen Shop mit Bankkonto in Deutschland schätzen und einen passenden Verkaufspreis ermitteln.
- [ROI-Rechner](https://sellmath.app/de/roi-rechner/): Berechnen Sie die Kapitalrendite Ihrer Investition aus den Investitionskosten und dem gesamten Rückfluss.
- [PayPal Gebühren privat: Waren & Dienstleistungen und Freunde](https://sellmath.app/de/paypal-gebuehren-privat/): Berechnen Sie PayPal-Gebühren für Privatkonten: Waren und Dienstleistungen, Freunde und Familie sowie persönliche Auslandszahlungen in EUR.
- [eBay- und PayPal-Gebühren berechnen](https://sellmath.app/de/): Berechnen Sie Gebühren und Auszahlung für eBay, PayPal und Etsy mit den jeweiligen Annahmen für Deutschland. Prüfen Sie mit dem ROI-Rechner das Verhältnis von Ertrag und Einsatz.

## Français

- [Calcul des frais PayPal](https://sellmath.app/fr/frais-paypal/): Estimez les frais PayPal en France et trouvez le prix à facturer pour recevoir le montant net souhaité.
- [Calcul marge : taux de marge et taux de marque](https://sellmath.app/fr/calcul-marge/): Calculez votre marge commerciale, votre taux de marge, votre taux de marque et votre coefficient multiplicateur à partir de prix hors taxes.
- [Calcul TVA : du HT au TTC et du TTC au HT](https://sellmath.app/fr/calcul-tva/): Calculez le montant de TVA, le prix HT et le prix TTC. Choisissez un taux de France métropolitaine ou saisissez votre propre taux dans cette calculatrice TVA.
- [Calcul frais eBay : particulier et professionnel](https://sellmath.app/fr/calcul-frais-ebay/): Estimez les frais de vente eBay, le montant reçu par le vendeur et le prix payé par l’acheteur. Choisissez le mode particulier ou professionnel.
- [Frais Vinted : estimation du total acheteur](https://sellmath.app/fr/frais-vinted/): Estimez les frais Vinted et le total payé par l’acheteur à partir de votre prix. Sans frais de vente, vous recevez 100 % du prix fixé.
- [Frais de vente, TVA et marge commerciale](https://sellmath.app/fr/): Estimez vos frais eBay, Vinted ou PayPal, passez du HT au TTC et calculez votre marge commerciale. Choisissez l’outil adapté à votre vente.

## 日本語

- [メルカリ手数料・利益計算と販売価格逆算](https://sellmath.app/ja/mercari-tesuryo-keisan/): メルカリの販売手数料と送料を差し引いた利益を計算。希望する利益から販売価格を逆算でき、配送方法・サイズ別の送料も選べます。
- [利益率計算](https://sellmath.app/ja/rieki-ritsu-keisan/): 販売価格と原価から利益額、売上高利益率、原価に対する利益率を計算します。
- [ROAS計算](https://sellmath.app/ja/roas-keisan/): 広告経由の売上と広告費からROAS（広告費用対効果）を倍率とパーセントで計算します。
- [楽天ラクマ手数料計算・利益と販売価格の逆算](https://sellmath.app/ja/rakuma-tesuryo-keisan/): 楽天ラクマの販売実績別手数料と送料・原価から利益を計算。振込手数料も選択でき、必要な販売価格を逆算します。
- [ヤフオク手数料計算・落札システム利用料と利益](https://sellmath.app/ja/yahuoku-tesuryo-keisan/): Yahoo!オークションの落札システム利用料、送料と原価を引いた利益を計算。希望額から落札価格を逆算できます。
- [フリマアプリ手数料比較：メルカリ・ラクマ・ヤフオク](https://sellmath.app/ja/furima-tesuryo-hikaku/): メルカリ・楽天ラクマ・ヤフオクの販売手数料、受取額、利益を同じ条件で比較。各サービスの必要販売価格も逆算します。
- [メルカリ・ラクマ・ヤフオクの手数料計算](https://sellmath.app/ja/): 販売手数料と送料・仕入れ費用を確認し、手元に残る金額を計算。フリマアプリの比較から、利益率や広告費の確認まで。