GVM and GCM Calculator

See your current numbers, not just your limits.

Setting a vehicle up to tow is a balancing act, and towing capacity is only one side of it.

GVM and GCM aren’t separate numbers to check in isolation, GCM is your vehicle’s Projected GVM and your van’s Projected ATM added together. Log what’s in each once, and see the full picture, everything in the car, everything in the van, connected, and what that actually means for your setup.

Log your accessories and cargo once, and your GVM and GCM update automatically every time your setup changes.

Tim·Ranger Sport + Atlas RVS

I wonder if adding a roof rack and an awning will put us over GVM?

Worked out in OSCA

Roof rack+25 kg
+
Awning+18 kg
=
Added43 kg
37 kg over GVM

Only 6 kg of GVM is left once hitched, so another 43 kg appears to exceed GVM. Something else would have to come off first.

Last 100 kg of GVM37 kg over
Ranger towing the Atlas on a dirt road
2023 Ford Ranger Sport + 2025 Atlas RVS 196
Payload Available326 kgUnhitched, with accessories and cargo
Tow Ball (kg)320 kgCarried by the Ranger once hitched
GVM Remaining (Hitched)6 kgAppears to be within GVM

Vehicle GVM Evaluation

GVM Projected2,904 kg
GVM - Projected + Ball Weight3,224 kg
GVM Projected Status

Vehicle GCM Evaluation

GCM - Projected6,129 kg
GCM - Remaining221 kg
GCM Status

This Vehicle + Trailer combination appear to be within acceptable tolerances. We suggest having a professional validate this to ensure safety and compliance.

Why it matters.

GVM is what your vehicle weighs fully loaded, alone. GCM is what your vehicle and van weigh together. You can be under one and over the other, and either one being wrong changes how your rig handles and what you’re legally allowed to do.

Most people only ever check these numbers once, when they buy. Add one accessory, one water tank, one extra passenger, and the numbers move. The calculator is built to be checked again, not just once.

Log Vehicle

See your GVM and GCM in a couple of minutes

Related