🧮 Tape Calculator Quick math with running tape for adding up costs and profits 💬 Offer Calculator Instantly see your profit when buyers send offers 💸 Discount Calculator See how price drops affect your bottom line 📦 Bundle Calculator Calculate profits on Poshmark/Mercari bundles 📊 Wholesale Lot Break down lot purchases to cost per item 📍 Break-Even Find the minimum price to avoid losing money 🏛️ Sales Tax Lookup State-by-state sales tax rates and rules