Usps Flat Rate Prices Calculator

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USPS Flat Rate Shipping Calculator

Estimate your Priority Mail® Flat Rate shipping costs instantly.

Flat Rate Envelope (12-1/2″ x 9-1/2″) Legal Flat Rate Envelope (15″ x 9-1/2″) Padded Flat Rate Envelope (12-1/2″ x 9-1/2″) Small Flat Rate Box (8-5/8″ x 5-3/8″ x 1-5/8″) Medium Flat Rate Box (Top & Side Loading) Large Flat Rate Box (12″ x 12″ x 5-1/2″) APO/FPO/DPO Large Flat Rate Box
Estimated Total Postage
$0.00

Understanding USPS Priority Mail Flat Rate Pricing

USPS Priority Mail® Flat Rate pricing offers a simple, straightforward way to ship packages within the United States. The primary advantage of this service is that the price you pay is determined solely by the box or envelope you choose, rather than the weight of the package or the distance it is traveling (zones).

Key Features of Flat Rate Shipping

  • Weight Limit: You can ship any package up to 70 lbs.
  • Destination: One price for any state within the U.S. (domestic).
  • Materials: You must use the specific USPS-branded Flat Rate boxes or envelopes, which are available for free at Post Offices.
  • Speed: Delivery typically takes 1, 2, or 3 business days based on origin and destination.

Current Flat Rate Box Sizes and Retail Pricing Estimates

Choosing the right container is essential for minimizing your shipping costs. Below is a breakdown of the standard Flat Rate options currently available.

Package Type Approximate Retail Price Typical Usage
Flat Rate Envelope $9.85 Documents, passports, letters.
Legal Flat Rate Envelope $10.15 Legal-sized documents, contracts.
Padded Flat Rate Envelope $10.60 Clothing, soft goods, books.
Small Flat Rate Box $10.40 Small electronics, jewelry.
Medium Flat Rate Box $18.40 Shoes, office supplies, larger components.
Large Flat Rate Box $24.75 Computers, large gifts, heavy items.

When to Use Flat Rate vs. Standard Priority Mail

While Flat Rate is convenient, it isn't always the cheapest option. Flat Rate is most cost-effective when you are shipping heavy items over long distances. If you are shipping a lightweight item (under 2 lbs) or shipping to a nearby zone (e.g., within the same state), using your own packaging and paying by weight/zone might be cheaper than the flat rate price.

Is tape included?

No, while the boxes are free, you must provide your own packing tape. However, the envelopes usually feature a self-sealing adhesive strip.

Note: The prices generated by this calculator are based on standard retail rates. Commercial Base pricing (available through online shipping software) may offer discounts.

function calculatePostage() { // 1. Get input values var typeSelect = document.getElementById("packageType"); var qtyInput = document.getElementById("packageQty"); var resultBox = document.getElementById("resultBox"); var totalDisplay = document.getElementById("totalCostDisplay"); var breakdownDisplay = document.getElementById("breakdownDisplay"); // 2. Validate Quantity var qty = parseFloat(qtyInput.value); if (isNaN(qty) || qty < 1) { qty = 1; qtyInput.value = 1; } // 3. Define Retail Prices (2024 Estimates) // Note: These are base retail prices and subject to change by USPS. var price = 0; var typeName = ""; switch(typeSelect.value) { case "envelope": price = 9.85; typeName = "Flat Rate Envelope"; break; case "legal": price = 10.15; typeName = "Legal Flat Rate Envelope"; break; case "padded": price = 10.60; typeName = "Padded Flat Rate Envelope"; break; case "small": price = 10.40; typeName = "Small Flat Rate Box"; break; case "medium": price = 18.40; typeName = "Medium Flat Rate Box"; break; case "large": price = 24.75; typeName = "Large Flat Rate Box"; break; case "apo": price = 23.00; // Usually slightly discounted compared to standard Large typeName = "APO/FPO Large Box"; break; default: price = 0; typeName = "Unknown"; } // 4. Calculate Total var totalCost = price * qty; // 5. Format Output var formatter = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD', }); // 6. Display Results resultBox.style.display = "block"; totalDisplay.innerHTML = formatter.format(totalCost); breakdownDisplay.innerHTML = qty + " x " + typeName + " @ " + formatter.format(price) + " / unit"; }

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