Verified 2026 carrier rates
Dimensional Weight & Shipping Calculators
Stop overpaying for shipping. Calculate dimensions, Amazon fees, and carrier rates against our live 2026 database instantly.
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DIM Weight Calculator
Calculate volumetric weight for UPS, FedEx, and USPS.
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Box Size Finder
Find the smallest box that fits your items with dunnage.
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FBA Fee Calculator
Estimate Amazon FBA fees and profit margins.
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USPS Cubic Rates
Check eligibility for USPS Cubic tier pricing.
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HS Duty Estimator
Estimate import duties and de minimis thresholds.
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Verified Rate Data
All carrier rates are manually verified against official carrier notices. Current version: 2026 Q2.
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The Operations Hub for Modern Sellers
DimMath provides free shipping calculators for e-commerce sellers. Calculate dimensional weight, FBA fees, USPS Cubic rates, and import duties against verified 2026 carrier data, instantly.
Verified 2026 Rate Data Always calculated against the latest official carrier fee schedules.
Zero-Latency Reactivity Tools render locally. No page reloads or "Calculating..." spinners.