Calcrux

Tool directory

All free business tools

20 live tools across 5 ecosystems and 17 subcategories — with hundreds more on the roadmap.

Ecommerce Seller Operations

Profit, inventory, shipping, and ads tools for marketplace sellers

Financial & ProfitabilityInventory & OperationsShipping & LogisticsAds & Marketing

Amazon FBA Profit Calculator

Calculate your true Amazon FBA profit, margin, and ROI in seconds.

Open

Amazon Ads ROAS Calculator

Find your true ad ROAS, ACoS, break-even point, and the max CPC you can profitably bid.

Open

Amazon PPC Break-Even Calculator

Find your break-even ACoS, max CPC bid, and the conversion rate you need to stay profitable.

Open

Amazon FBA Restock Calculator

Find your reorder point, when to reorder, and the exact quantity to order — without the spreadsheets.

Open

Flipkart Fee Calculator

Find your Flipkart settlement, net profit, and full fee breakdown — by category, seller tier, and COD share.

Open

eBay Fee Calculator

See your real net profit on every eBay sale — final value fee, per-order fee, international, promoted listings, and store subscription break-even.

Open

Etsy Fee Calculator

See your real net profit on every Etsy sale — transaction fee, listing fee, payment processing, Offsite Ads, and Etsy Plus break-even.

Open

Shopify Profit Calculator

See your real Shopify profit per order and per month — plan fee, payment processing, COGS, ads, and the exact revenue where upgrading your plan pays off.

Open

Selling Price Calculator

Find the exact price to charge to hit your target margin after marketplace and payment fees — the pricing tool that grosses up for fees so you never underprice.

Open

LTV CAC Calculator

Calculate customer LTV, CAC, the LTV:CAC ratio and payback period — then reverse it to find the max CAC you can afford. All on gross profit, in any currency.

Open

Dimensional Weight Calculator

Work out the dimensional (volumetric) weight, the billable weight, and the chargeable weight for any package — across every major carrier divisor, in pounds or kilos.

Open

Average Order Value Calculator

Calculate average order value in seconds — then get a free-shipping threshold, items per order, revenue per visitor, and a what-if AOV-uplift simulator.

Open

GMROI Calculator

Find out how much gross profit each dollar of inventory earns you in a year — with the >1 / ~3.2 benchmark verdict and the two levers (margin and turnover) that move it.

Open

Discount & Promotion Profit Calculator

See the real cost of a sale before you run it: the exact extra volume a discount needs to break even on profit, and how deep you can safely go.

Open

Break-Even ROAS Calculator

Find the minimum profitable ROAS for any channel — break-even and target ROAS, with ACoS conversion and a fee-aware profit cushion.

Open

Economic Order Quantity (EOQ) Calculator

Find the order quantity that minimises your total inventory cost — the EOQ calculator that also shows orders per year, cycle days, and whether a bulk discount beats the EOQ.

Open

Profit Margin Calculator

Stack gross, operating and net margin from your P&L lines in one view — plus the markup-on-cost equivalent, in any currency.

Open

Walmart Fee Calculator

See your real net profit on every Walmart Marketplace sale — referral fee by category, WFS fulfillment cost, and break-even, with $0 monthly fees.

Open

Cart Abandonment Calculator

Turn your cart abandonment rate into a recovery plan: see lost revenue this period, the share you can win back at your recovery rate, and the annual total.

Open

Inventory Turnover Calculator

Find your inventory turnover ratio, days sales of inventory, and weeks/months of supply — with a benchmark verdict that tells you if you're overstocked or running too lean.

Open
Browse all Ecommerce Seller Operations tools

India Business Operations

HR, salary, GST, and business finance tools for Indian businesses

HR & SalaryBusiness FinanceFreelancers & Agencies

Tools launching soon

3 subcategories planned in this ecosystem

Browse all India Business Operations tools

Manufacturing & ERP Operations

Production planning, costing, and maintenance tools for manufacturers

Production PlanningManufacturing CostingMaintenance & ReliabilityInventory & Procurement

Tools launching soon

4 subcategories planned in this ecosystem

Browse all Manufacturing & ERP Operations tools

Startup & Business Intelligence

Runway, fundraising, equity, and growth tools for founders

Startup FinanceFunding & EquityStrategic Planning

Tools launching soon

3 subcategories planned in this ecosystem

Browse all Startup & Business Intelligence tools

Operational Financial Planning

Personal finance, business planning, and risk analysis tools

Personal FinanceBusiness Finance PlanningRisk & Planning

Tools launching soon

3 subcategories planned in this ecosystem

Browse all Operational Financial Planning tools