Logistics calculators for Shopify merchants, Amazon sellers and online retailers
Know what every order really costs to ship, fulfill and sell.
Free calculators for dimensional weight, shipping, landed cost, 3PL fees, Shopify margins and Amazon FBA profit. Every formula is shown step by step, you enter your own rates, and all calculations run privately in your browser.
Featured calculators
All calculatorsA good place to start. Pick one and enter your own numbers.
Dimensional Weight Calculator
Find the dimensional and billable weight of a box using any carrier divisor and unit.
Shipping & parcelsShipping Cost Calculator
Estimate a parcel’s cost from your rate card, with fuel and delivery surcharges itemized.
ImportingLanded Cost Calculator
Add freight, duty, import tax and fees to supplier cost to get a true cost per unit.
Fulfillment & inventory3PL Fulfillment Cost Calculator
Turn a 3PL price sheet into a monthly bill and cost per order, and compare up to three.
Profit & pricingShopify Profit Margin Calculator
See what an order really earns after fees, shipping, returns and ads, and your break-even CPA.
Profit & pricingAmazon FBA Fee & Profit Calculator
Estimate FBA profit per unit and break-even price from the fees you enter.
Calculators by category
Shipping & parcels
Billable weight, parcel shipping estimates and shipping insurance.
- Dimensional Weight CalculatorFind the dimensional and billable weight of a box using any carrier divisor and unit.
- Shipping Cost CalculatorEstimate a parcel’s cost from your rate card, with fuel and delivery surcharges itemized.
- Shipping Insurance Cost CalculatorEstimate the premium for insuring a parcel and its cost as a % of declared value.
Importing
The full cost of bringing goods across a border.
Fulfillment & inventory
3PL pricing and the cost of holding stock.
Profit & pricing
Margins, break-even points and marketplace fees.
Transparent formulas
Every result shows the formula with your numbers filled in, and each page explains the method, a worked example and common mistakes.
Your rates, not invented ones
Carrier rates, marketplace fees and duty rates change often. You enter the figures from your own contracts and fee pages, so the answer reflects your business.
Private by design
Calculations happen on your device. Nothing you type is sent to a server, and saved rate cards stay in your own browser.
Guides
All guides3PL Pricing Explained: How to Compare Fulfillment Quotes
What each line on a 3PL price sheet means, why the cheapest pick-and-pack fee rarely wins, and a method for comparing fulfillment quotes fairly.
Dimensional Weight Explained: Why Light Boxes Cost More to Ship
What dimensional weight is, how carriers use divisors and rounding to set billable weight, and practical ways to stop paying to ship air.
How to Calculate Landed Cost for Imported Products
A step-by-step method for working out the true cost per unit of imported stock: valuation basis, duty, import VAT, fees and allocation across products.
How to Lower Parcel Shipping Costs Without Switching Carrier
Practical ways to reduce what you pay per parcel: billable weight, surcharges, service choice, insurance and how you charge customers for shipping.
Margin vs Markup vs Contribution Profit for Online Stores
Clear definitions of markup, gross margin and contribution profit, how to convert between them, and why break-even ad spend depends on contribution.