There are ways ...
It would be rude of us to suggest that you may need to "think outside of the box" when it comes to weighing a parcel before you arrange a collection. The truth is, though, along with inappropriately packaged items, submitting the wrong weight is one of the biggest issues that arise when sending a parcel via a courier network. What's more, we do reserve the right to pass on any extra charges we face if a parcel has its weight underestimated.
There are a few things that you can do to get the correct weight:
It would be worth checking different price points when you're getting a courier quote if you add a kilo or two to your estimated weight check to see if the price rises or not. This should give you a touch more peace of mind.
We recently came across a handy app for your smartphone via ProductHunt called AirMeasure, which allows you to measure a box without needing a tape measure. It is a virtual tape measure allowing you to measure a box at any time in any place, perfect for that odd occasion when you need to know the parcel dimensions.
You can of course measure the height, width and length of your parcel using a tape measure if you have one.