Ecommerce Calculators

Last updated: October 2026

Conversion Rate Calculator

Calculate a conversion rate: the percentage of visitors who bought, signed up or completed another goal.

Calculate the sales tax owed on an ecommerce purchase given the pre-tax order amount and the applicable tax rate.

Estimate a baseline shipping cost from package weight, shipping distance, and a per-unit rate using the simplest multiplicative model.

Work out what percentage discount you are actually getting when a retailer advertises a dollar saving rather than a percentage off.

Turn a unit cost and a markup percentage into a selling price, and see the profit and the gross margin that markup gives you.

Calculate what percentage of product page views result in an actual purchase.

Instantly calculate how much a payment gateway like Stripe or PayPal will charge per transaction.

Find how many units you must sell, or how much revenue you need, to cover fixed and variable costs.