Transparent math. No login. Editable assumptions. See the update policy
Ecommerce unit economics, made usable

Know your margin
before you scale it.

Free calculators for pricing, fees, advertising, sourcing and operations. Every assumption is editable. Every formula is explained.

10 focused calculators 0 accounts required 100% editable inputs
Example order Modeled
Net profit $14.82 24.7% margin
Revenue$60.00
Product + logistics−$30.00
Fees + returns−$7.18
Acquisition−$8.00
→ Price and product cost are the highest-impact levers in this example.
For marketplace sellers DTC operators Print-on-demand brands Wholesale makers Lean ecommerce teams
Start with the decision in front of you

Useful tools, not filler pages.

Each calculator has a distinct formula, worked example, limitations and update note. The site is designed around decisions sellers already need to make.

Marketplace fees

Etsy Profit

Free Etsy profit calculator for estimating profit after transaction, payment, listing, Offsite Ads and seller costs, with margin and break-even item price.

Open calculator →
Advertising

Break-even ROAS

Free break-even ROAS calculator for ecommerce. Calculate maximum CPA, break-even ROAS and a profit-preserving target from your real order costs.

Open calculator →
Unit economics

Product Margin

Free ecommerce profit calculator for profit per order, contribution margin, markup and break-even price after COGS, shipping, fees, returns and acquisition cost.

Open calculator →
Store economics

Shopify Profit

Free Shopify profit calculator for monthly store profit and margin after COGS, payment fees, fulfillment, shipping, returns, apps, fixed costs and ad spend.

Open calculator →
Sourcing

Landed Cost

Free landed cost calculator for total landed cost and cost per unit across goods, freight, insurance, duty, import tax, brokerage, port fees and delivery.

Open calculator →
Operations

Return Impact

Free ecommerce return rate calculator. Estimate loss per return, monthly profit impact, margin after returns and the return rate that would consume gross profit.

Open calculator →
Pricing

Wholesale Price

Free wholesale price calculator for setting wholesale price and suggested MSRP while protecting maker margin after overhead, commission and MOQ discounts.

Open calculator →
Shipping

Dimensional Weight

Free dimensional weight calculator for cm/kg or in/lb. Compare actual weight with volumetric weight and estimate billable weight using an editable carrier divisor.

Open calculator →
Inventory

Reorder Point

Free reorder point calculator for inventory. Calculate lead-time demand, safety stock, reorder point and a case-pack-rounded order quantity.

Open calculator →
Pricing

Discount Profitability

Free discount profitability calculator. Compare baseline and promotional profit, required sales lift and the maximum discount supported by projected volume.

Open calculator →
Optional paid decision layer

From one calculator result to a prioritized action brief.

Save one scenario, verify the assumptions, see the top three modeled opportunities and leave with guardrails, a five-step plan, a seven-day sprint and an action CSV. The calculator stays free; the report is a one-time purchase.

Profit Action Report $19.00 One scenario · no subscription
  • Ranked diagnosis
  • Sensitivity tests
  • Five-step action plan
  • Private shareable link
Live checkout available
Learn the decision logic

Worked examples for the numbers that matter.

Use the guides to understand the formula, avoid common classification errors and turn a calculator result into an operating decision.

Marketplace fees4 min read

Etsy fees by order value

See how fixed and percentage Etsy fees behave across four order values, then compare effective fee rate with profit per order.

The operating loop

From rough assumption to better decision.

The calculators are intentionally simple enough to use in minutes and structured enough to become a weekly operating habit.

  1. 01

    Enter your real costs

    Start with defaults, then replace every material number with a statement, invoice or recent operating average.

  2. 02

    Find the binding constraint

    Use the result and cost breakdown to see whether price, product, shipping, fees, returns or acquisition is doing the damage.

  3. 03

    Test one lever at a time

    Make a controlled change, measure profit per visitor or order, and update the model with realized data.

profit = revenue
  − product_cost
  − fulfillment
  − fees
  − expected_returns
  − acquisition_cost
Built for trust

The AI never owns the math.

All financial outputs come from deterministic, testable Python formulas. An optional paid report can use OpenAI to organize findings and actions, but it receives the completed calculation and is instructed not to alter a number.

  • Server-rendered pages for speed and discoverability
  • Rate fields stay editable when platforms change
  • Source-monitoring workflow flags official fee-page changes
  • No comments, profiles, uploads or moderation queue
Read the methodology →
Begin with the universal model

Is the next order actually worth winning?

Calculate fully loaded profit per order before increasing ad spend, accepting a discount or adding another sales channel.

Run ecommerce profit calculator