Vault Line Tools
Profitability Calculator
Know your numbers before you list — or before you buy. Toggle modes, set profit targets, factor in every cost, and see your exact margins across all platforms.
Enter 0 or leave blank if free
Optional — shows annualized ROI
Profit tiers to display (select up to 3)
Advanced options
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Packaging & supply costs
Materials cost per item (bubble mailer, toploader, sleeve, tape, etc.)
Default $0.50 is typical for a single
Overhead allocation
Divide your monthly fixed costs (Shopify, apps, storage) by expected units to get a per-item overhead charge
Shopify $39 + apps + supplies budget
Grading cost
eBay promoted listings
Additional % added to eBay's effective fee rate (0 = not using promotions)
eBay effective rate: 13.25% + $0.30
After-tax profit
Saved presets & calculation history
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Saved Presets
Recent Calculations
Enter your item cost and source platform above to see targets.
Offer evaluator — should I accept this offer?
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Enter your list price and an incoming offer to see what it nets after fees — and whether it hits your profit target.