Convert pounds to grams when following a metric recipe, weighing ingredients, preparing meals, or checking a package.
1 lb = 453.59237 g
How to Convert Pounds to Grams
One international avoirdupois pound contains exactly 453.59237 grams. This exact relationship is listed in NIST Handbook 133 .
Multiply the weight in pounds by 453.59237 to find the equivalent weight in grams:
Grams = pounds × 453.59237
Example: Convert 2 Pounds to Grams
Multiply 2 by 453.59237:
2 lb × 453.59237 = 907.18474 g
Rounded to the nearest gram, 2 pounds is approximately 907 grams. The appropriate amount of rounding depends on the precision of the original measurement and its intended use. See NIST guidance on writing and converting SI units for more information about unit symbols and significant digits.
Quick Cooking Estimate
If you do not need an exact result, you can remember that one pound is roughly 454 grams. Some recipes round this further to 450 grams for quick mental calculations.
- Accurate conversion: 1 lb = 453.59237 g
- Easy kitchen estimate: 1 lb ≈ 454 g
- Quick mental estimate: 1 lb ≈ 450 g
Use the exact conversion for baking or any task where small differences could affect the result.
Pounds to Grams Conversion Table
| Pounds | Grams |
|---|---|
| 0.25 lb | 113.40 g |
| 0.5 lb | 226.80 g |
| 1 lb | 453.59 g |
| 2 lb | 907.18 g |
| 3 lb | 1,360.78 g |
| 4 lb | 1,814.37 g |
| 5 lb | 2,267.96 g |
| 10 lb | 4,535.92 g |
| 20 lb | 9,071.85 g |
| 50 lb | 22,679.62 g |
| 100 lb | 45,359.24 g |
A 1.5 lb Parcel Crossing the Atlantic
Maya is preparing a small birthday parcel to send from Boston to her friend in Manchester. The box contains a folded T-shirt, a paperback novel and a handwritten card. After sealing the package and adding the address label, her household scale shows a total weight of 1.5 lb.
While the reading is familiar to Maya, parcel weights in the UK are often expressed in grams or kilograms. To enter the shipment details in metric units, she uses an lb to g converter to calculate the equivalent weight.
Converting the Packed Parcel
One international avoirdupois pound is defined as exactly 453.59237 grams. To convert pounds to grams, Maya multiplies the scale reading by this conversion factor:
1.5 lb × 453.59237 = 680.388555 g
Rounded to the nearest gram, the parcel weighs approximately 680 g. The pounds‑to‑grams conversion can be summarised as:
1.5 lb ≈ 680 g
Why Maya Weighs the Parcel After Sealing It
The T-shirt, book and card are not the parcel’s full shipping weight. Packaging materials such as the box, padding, tape and label also add to the total. Weighing the completed parcel provides a more accurate value than estimating the weight of individual items.
When a parcel is close to a carrier’s weight threshold, a small margin can be helpful because household scales and commercial shipping scales may round measurements differently.
The Conversion Does Not Set the Postage Price
Knowing that the parcel weighs about 680 g helps Maya complete the shipment form, but weight is only one factor that may influence postage costs. Delivery services may also consider the box dimensions, destination, delivery speed and tracking options. Some large but lightweight parcels may be assessed using dimensional weight.
Because prices, service limits and customs instructions can change, Maya reviews the current requirements of her chosen carrier before purchasing postage.
Nothing physical happens to the parcel when its measurement changes from 1.5 lb to approximately 680 g. The conversion simply expresses the same package in units that are more familiar at its destination.