TowCalc: Trailer Weights
Enter your truck, hitch and trailer and see every towing limit at once: payload, GVWR, GCWR, axle and the tongue weight percent, plus the largest trailer you can pull.
Download on theApp StoreSee every towing limit at once, before you leave the yard.
TowCalc turns your tow vehicle ratings, your hitch ratings and a trailer weight into a clear read on how your load compares to your ratings. Enter the numbers off the door jamb label and a scale ticket, and the app checks every limit and tells you how much headroom is left.
What It Does
- GVWR: the loaded vehicle against its rating, with the payload you have used and what is left.
- GCWR: the vehicle and trailer together against the combined rating, with headroom to spare.
- Tongue weight: the percent on the ball against the healthy 10 to 15 percent target, and the exact weight to aim for.
- Axle and hitch checks: the combined front and rear axle rating, and the hitch tongue and trailer ratings, for a weight carrying or a weight distributing setup.
- Largest trailer: the single biggest trailer this rig can pull, with the weakest link named, whether that is the combined rating, the payload, or the hitch.
- Clear warnings the moment any limit is passed or the tongue is too light or too heavy.
- Metric or imperial throughout: pounds or kilograms.
Save Your Rigs
Save each truck as a profile and keep the trailers you tow as loads under it. Reopen a rig in one tap, compare loads on a chart across your history, and watch the app grow more useful the more you tow. Nothing leaves your iPhone.
Load Placement Guide
See how to shift the load to land in the tongue weight target, and an estimate of how the tongue adds weight to the rear axle and lifts it off the front, from your wheelbase and hitch overhang. Practical loading tips included.
Free and Pro
The full single calculation is free, forever. The one-time Pro unlock adds saved vehicle profiles and loads, the load placement guide, and export. There is no subscription: pay once and keep it.
Pro Export
Export a per-rig PDF tow sheet with the ratings and every load, and a CSV of your whole library, straight from the share sheet.
Private by Design
No account, no cloud, no tracking. Every rig you enter stays on your device.
TowCalc is a planning aid, not a certified weight. Always confirm actual weights on a certified scale and follow your vehicle and hitch ratings before towing.
More in this category
TowCalc: Trailer Weights does one job well, works offline, and keeps your data on this device. There is no cloud sync, no account, and nothing to sign up for.
Who it is for
TowCalc: Trailer Weights is for anyone who wants a dependable way to handle this without a spreadsheet or a complicated setup. It sits in the Utilities category on the App Store.
Private by design
No ads, no trackers, no data harvesting, and no cloud sync. Your entries stay on this device and never pass through our servers. There is a Delete All My Data control, so you stay in charge.
Common questions
What is TowCalc: Trailer Weights?
Enter your truck, hitch and trailer and see every towing limit at once: payload, GVWR, GCWR, axle and the tongue weight percent, plus the largest trailer you can pull.
Is TowCalc: Trailer Weights on the App Store?
Yes. It is available now on the App Store.
Does TowCalc: Trailer Weights work offline?
Yes. Everything runs on your device, so it works with no signal.
Does TowCalc: Trailer Weights work on iPad?
Yes. It is a universal app and runs natively on iPhone and iPad.
Does TowCalc: Trailer Weights include in-app purchases?
Some advanced features require an in-app purchase. The App Store shows the current choices, prices, and terms for your storefront before you confirm anything.
Read the TowCalc guide · Contact support · Privacy
← All InnovaLabWorks apps