Gumroad Fee Calculator
Calculate your exact net profit per sale after Gumroad's 10% fee, Discover commissions (30%), and 2.9% + 30¢ credit card processing.
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✨ 100% Client-Side Creator Math
Free Calculators for Creators & Digital Sellers
Calculate your exact take-home profit before you price your digital products, publish on Amazon KDP, launch a paid newsletter, or build a membership community.
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Free Calculators
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In-Depth Guides
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Signup Required
100%
Browser-Based Math
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Financial Precision
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Instant mathematical models accounting for platform cuts, Stripe fees, and micropayments.
Amazon KDP Royalty Calculator
Compare 35% vs 70% eBook royalty tiers, factor in $0.15/MB digital delivery charges, and model paperback print manufacturing costs.
Launch Calculator →Substack Earnings Calculator
Forecast recurring monthly revenue (MRR) based on free-to-paid conversion rates, Substack's 10% fee, and annual subscription discount shares.
Launch Calculator →Ko-fi vs Patreon Fee Calculator
Side-by-side membership comparison. Test Ko-fi's 0% Gold plan against Patreon's 8% to 12% tiers, factoring in micropayment fees under $3.
Launch Calculator →YouTube RPM Earnings Estimator
Estimate AdSense revenue across 6 commercial niches (Finance, SaaS, Education, Gaming) adjusted by audience geography and video format.
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Frictionless Workflow
How Legend Tools Works
Transparent financial modeling in three straightforward steps.
01
Choose Your Platform
Select your distribution channel—Gumroad, Amazon KDP, Substack, Ko-fi, Patreon, or YouTube.
02
Enter Sales Metrics
Input your product list price, expected volume, file size, subscriber counts, or video view numbers.
03
Review Net Payouts
Inspect instant visual charts and itemized fee tables detailing platform cuts, gateway fees, and deposited cash.
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In-Depth Creator Research
Latest Educational Master Guides
Practical frameworks, pricing psychology, and platform fee analyses.
How to Price Your Digital Products: The Complete Framework
Avoid the race to the bottom. Learn value-based pricing, price anchoring, and tiered packaging to scale digital downloads.
Read Guide →
Amazon KDP Royalties Explained for Beginners
A complete breakdown of the 35% vs 70% Kindle royalty rules, digital file delivery costs, and paperback print formulas.
Read Guide →
Substack vs Patreon vs Ko-fi: Creator Comparison
Compare take-home payouts, payment gateway fees, micropayment charges, and member churn across the top three membership platforms.
Read Guide →
Privacy & Integrity
Built with Creator Privacy in Mind
🔒 100% Client-Side
All mathematical calculations execute locally in your browser. We never store or transmit your sales projections.
🚫 Zero Account Friction
No passwords to remember, no mandatory email capture, and no subscriptions to access complete results.
📑 Sourced from Official Docs
Every fee percentage is verified against official platform documentation and maintained in our centralized config.
Common Inquiries
Frequently Asked Questions
Yes, 100% free. There are no paywalls, premium tiers, signups, or email capture requirements.
Never. All calculations run strictly in your browser using client-side JavaScript. Your financial metrics never reach any remote database.
We review official platform documentation quarterly and update our centralized configuration whenever fee revisions occur.
Yes. Legend Tools is fully mobile-responsive and designed for touchscreens, with zero horizontal scroll and 44px+ tap targets.
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