LotMargin: Resale Ledger

Know what you keep on every resale. LotMargin helps independent resellers check a deal before buying, split a bulk purchase into individual costs and track what each item actually earns. CHECK BEFORE YOU BUY Enter your expected sale, purchase price, shipping, other costs and fee assumptions. See estimated profit and the maximum purchase price that meets your target. SPLIT A LOT Turn a bulk purchase into individual inventory records. Costs are allocated equally, with leftover pennies assigned exactly so the total stays correct. Rename and price each item in your ledger. FOLLOW YOUR INVENTORY Keep purchase dates, categories, lot names and notes together. Record actual sale amounts and expenses, then separate realized profit from unsold estimates. KEEP YOUR RECORDS Export a CSV for spreadsheets or a JSON backup for restoring your ledger. Your records are stored on your device. No sign-up, advertising or developer-operated cloud storage. Save backups regularly; automatic cloud sync is not included. FREE AND PRO Use the calculator and create up to 20 inventory records free. Pro Lifetime is an optional one-time purchase that lets you add more records, with no automatic renewal. Existing records, editing, sales logging, exports and backups remain available without Pro. Fee rates are entered by you and apply to the entered sale amount. Marketplace integrations, automatic fee updates, exchange-rate conversions and tax filing are not included. Profit calculations exclude income tax and any expenses you have not entered.