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Free postal tools & calculators

Nine fast, accurate tools for stamps, postage, shipping costs, and delivery, built on current USPS prices.

Stamp CalculatorHow many Forever stamps you need for any letter or envelope.Postage Price CalculatorEstimate the cost to send a letter or package by service.Shipping Cost ComparisonUSPS vs UPS vs FedEx, side by side.Dimensional Weight CalculatorDIM weight from a package's dimensions.Delivery Time EstimatorEstimated days between two ZIP codes.International Duty & Customs EstimatorRough duties and taxes by destination and value.Mail Class SelectorThe cheapest, right service for your item.Flat Rate Box SelectorWhether flat-rate or weight-based pricing is cheaper.Postal Holiday & Delivery Day CheckerWhich carriers deliver on a given date.