Skip to main content
∑
Conversion

Volumetric (Dimensional) Weight Calculator (Air / Courier)

Airlines and international couriers bill by whichever is greater — actual weight or volumetric (dimensional) weight. Enter your parcel's length, width and height plus the carrier's DIM divisor, and this tool instantly returns the parcel volume, the volumetric weight and the chargeable weight. Defaults: a 50 × 40 × 30 cm box weighing 3 kg under the IATA 6000 cm³/kg air-freight standard.

Parcel volume

—

Volumetric weight

—

Chargeable weight

—

Reference only — the carrier measures and bills based on their own scan.

Formula

Volumetric weight = (L × W × H) ÷ DIM divisor; chargeable weight = max(actual weight, volumetric weight)

Frequently asked

When does volumetric weight apply, and when does actual weight win?

Every carrier weighs the parcel (actual weight) AND measures it (volumetric weight via the DIM formula), then bills by whichever is larger. Bulky-but-light shipments (pillows, plush toys, oversized boxes with packing voids) usually trigger volumetric billing; dense shipments (books, metal parts) usually bill by actual weight. Rule of thumb: once each ~5000 cm³ exceeds 1 kg of real weight, the parcel is close to the crossover point.

Why does DHL/FedEx use 5000 but airlines use 6000?

IATA harmonised the air-freight volumetric ratio at 1:6 (6000 cm³ per kg) in 2015 and most airlines have kept it since — aircraft cabins are volume-limited. Express integrators (DHL, FedEx International, UPS International) use the stricter 5000 cm³ per kg, which produces ~20% higher volumetric weights, reflecting their door-to-door sorting and ground-handling costs.

Why is the UPS/FedEx US domestic divisor 139?

139 in³/lb is the stricter version of 166: UPS and FedEx dropped US domestic ground from 166 to 139 in January 2017, lifting volumetric weights by ~19% — a direct response to e-commerce parcels with low density. Conversion factor: 1 in³/lb ≈ 36.13 cm³/kg, so 139 in³/lb ≈ 5023 cm³/kg, basically the same as the DHL 5000 metric standard.

How do I estimate volumetric weight for a consolidated package?

Consolidators re-pack everything into a fresh carton, so the most accurate path is: compute each item’s volumetric weight, sum them, and compare with the total actual weight. If you don’t know the final carton size yet, sum the item volumes and multiply by 1.1–1.2 as a packing factor (tape, void fill, bubble wrap) before dividing by the DIM divisor. Remember: carriers measure the outer carton, so packing tightly really does save money.

Related tools

Length Unit Converter

Cm, m, km, in, ft, yd, mi — common length units, converted instantly.

Temperature Converter

Convert between Celsius (°C), Fahrenheit (°F) and Kelvin (K) instantly.

Shoe Size Converter (US / UK / EU / CM)

Enter your foot length or a size in any system to see the equivalent US / UK / EU and centimetre sizes.

Paper Size Reference

Pick a paper size (A0–A10, B / C series, Letter, Legal, card sizes) to see its mm / cm / inch / pixel dimensions.

Number Base Converter (Binary / Octal / Decimal / Hex)

Convert a number simultaneously between binary, octal, decimal and hexadecimal — useful for programmers, students and electronics work.

Aspect Ratio & Screen Size Calculator

From an aspect ratio and one side, find the other; or from a diagonal and ratio, get real width and height (4:3, 16:9, 21:9 …).

Data Storage Unit Converter (B/KB/MB/GB/TB)

Convert between bytes, KB, MB, GB, TB and PB — distinguishing decimal (1000-base, drive labels) from binary (1024-base, OS-reported).

RGB ↔ HEX ↔ HSL Color Converter

Convert between HEX (#RRGGBB), RGB(0–255) and HSL(0–360, 0–100, 0–100) instantly — with a live colour preview swatch.

Tire Size Calculator (Spec / Diameter / Speedometer Error)

Convert a P-metric tire spec (e.g. 225/65R17) into sidewall height, overall diameter, circumference and revolutions per km — and compare against a reference size to see speedometer error.

Energy Unit Converter (J / kJ / cal / kcal / kWh / BTU / Wh)

Convert between joules, kilojoules, calories, kilocalories, kilowatt-hours, BTU and watt-hours in a single view — for nutrition labels, electricity bills, heating and fuel comparisons.

Pressure Unit Converter

Convert between Pa, kPa, bar, mbar, atm, psi, mmHg, Torr and inHg in a single view — all the everyday pressure units.

Torque Unit Converter

Convert between N·m, kgf·m, kgf·cm, lbf·ft, lbf·in and ozf·in — all the torque units used on torque wrenches, bicycle bolts and car service specs.

Angle Unit Converter

Convert between degrees, radians, gradians, turns, arcminutes, arcseconds, milliradians and NATO mil — with live sin/cos/tan values for reference.

Fuel Economy Converter (MPG ⇄ L/100km)

Convert between L/100km, km/L, US MPG and UK (imperial) MPG — compare car efficiency figures across regions without arithmetic.

Power Unit Converter

Convert between W, kW, MW, mechanical horsepower (hp), metric horsepower (PS), BTU/hr, ft·lbf/s, cal/s, kcal/h and refrigeration tons in one view.

px ↔ rem ↔ em Converter

Pick a root font-size (defaults to 16 px) and convert any CSS pixel, rem, em, percentage or point value into the others, with a reference table for common sizes.

Alcohol ABV ↔ Proof Converter & Standard Drinks Calculator

Convert alcohol by volume (ABV %) to US proof and UK proof, plus compute grams of pure alcohol and "standard drinks" per pour for US / UK / AU / HK.

Bandwidth & Throughput Converter (Mbps ↔ MB/s)

Convert network bandwidth (kbps, Mbps, Gbps) to file-transfer rate (KB/s, MB/s, MiB/s) and estimate how long a given file size takes.

Weight / Mass Unit Converter

Kilograms, grams, milligrams, pounds, ounces, stones, tonnes, jin and tael — common mass units, converted instantly.

Battery mAh ↔ Wh Converter (Power Bank Airline Rules)

Enter battery capacity (mAh) and voltage (V) to get watt-hours (Wh) instantly — with a live IATA airline check (100 Wh / 160 Wh cut-offs).

International Bra Size Converter

Enter underbust and bust (or pick a local size) to convert bra sizes across US, UK, EU, AU and JP standards.

International Ring Size Converter

Enter inner circumference (mm) or diameter to cross-reference US, UK, EU, JP and HK ring sizes.

Area Unit Converter

Square metres, hectares, acres, square feet, square miles and more — common area units, converted instantly.

Volume / Capacity Unit Converter

Litres, millilitres, cubic metres, US and imperial gallons, quarts, pints, fluid ounces, cups, tablespoons and teaspoons — converted instantly.

Speed Unit Converter

Convert freely between km/h, mph, m/s, ft/s, knots and Mach number.

Color Contrast Ratio (WCAG) Calculator

Enter foreground and background hex colors to compute the WCAG 2.x contrast ratio (1:1 to 21:1) and see whether the pair passes AA / AAA accessibility levels for normal and large text.

AWG Wire Size Calculator

Look up the diameter (mm), cross-sectional area (mm²), resistance per kilometre and safe ampacity for any American Wire Gauge (AWG) size — handy for low-voltage wiring design.

Frequency Unit Converter (Hz / kHz / MHz / GHz)

Convert between Hz, kHz, MHz, GHz, THz, RPM and BPM — one input fills every other unit instantly.

Force Unit Converter (N / kN / lbf / kgf / dyne)

Convert between newtons (N), kilonewtons (kN), pound-force (lbf), kilogram-force (kgf), dyne and ounce-force (ozf) — bridging SI, imperial and CGS force units used in physics and engineering.

Magnetic Flux Density Converter (T / mT / µT / Gauss)

Convert magnetic flux density between tesla (T), millitesla (mT), microtesla (µT), gauss (G) and milligauss (mG) — handy for comparing MRI fields, Earth field, speakers and lab magnets across very different scales.