S'more's Outdoors^™

Pick a tool below — each one runs entirely in your browser, no signup required.

Not sure where to start? The Leveling Block Calculator helps you park level, Can I Tow It? checks towing safety, and the others cover water, propane, power, tire pressure, winterizing, clearance, and gear planning.

Got an idea for a tool that's missing? Use the “Got a tool idea?” form near the bottom of this page.

Like the site? The “Support us” form below that will mail you a free sticker for your rig.

Every tool works offline after your first visit while online. Opening a tool loads a copy into your browser; after that, the calculator, its math, and your saved inputs all live on your device, so it keeps working with no signal or data connection — handy at a campsite or on the road. Reopen a tool with a connection now and then so it can quietly grab any updates.

Results can also be saved as a PDF or shared by link.

Prefer different units? Use the US / Metric / UK toggle above — every tool's inputs and results convert automatically, and your choice is remembered site-wide.

The S'more's Outdoors mascot: a happy s'more character wearing a tiny explorer backpack and compass

100% free · no signupWorks offline

Free tools for RV, van, & overland life

Practical, no-signup calculators, and helpers built by people who actually camp out of their rigs.

RV Leveling Block Calculator Match two bubble levels and get exact blocks-per-tire for any four-wheeled RV — camper van, motorhome, or truck camper. Look up your rig by make/model/year or enter your own measurements. Open the calculator → Camper Power & Climate Planner Size an EcoFlow battery, charging, and air-conditioning kit to how you actually camp — or flip it around and rank which vehicles best fit your power needs. Plan your kit → Will It Trip the Breaker? Toggle your appliances against a 30/50-amp pedestal or your generator's real starting watts — including A/C surge, soft starts, and altitude derating. Check your loads → Will My Rig Scrape? Steep driveways and campground entrances scrape tails because of breakover — the combined angle of the slope change, not just one grade. Check before you commit. Check the angle → Can I Tow It? The towing check most buyers skip: tongue weight plus passengers and cargo has to fit your truck's payload sticker — not just the tow rating. Check every limit at once and see which one binds. Run the safety check → How Long Can We Boondock? Fresh, grey, and black tank duration for your crew and habits — including the part everyone learns the hard way: the grey tank usually fills before the fresh runs dry. Plan your water → Propane Duration How long a 20-lb tank really lasts running the furnace in the cold — honest duty-cycle math from your furnace BTU and the overnight low, plus water heater, stove, and fridge. Do the math → Tire Pressure by Axle Weight Your door-jamb sticker assumes max-GVWR loading — most trips are lighter. Match your cold tire pressure to your actual measured axle weight instead. Check your pressure → Winterization Antifreeze Calculator How many gallons of RV antifreeze you actually need, broken down line by line — rig size, fixture count, water heater bypass, and the extras people forget. Get your gallons →

Coming soon More RV tools Next up: a diesel/propane heater fuel-burn calculator, a campfire wood calculator, and a holding-tank chemical dosage calculator.

Got a tool idea?

Tell us what calculator or checker you wish existed — we build the ones people actually ask for. The tools above started exactly this way. If you include an email, we use it only to reply — we do not keep or share it otherwise.

Support us — get a free sticker!

Like the tools? Send us your address and we'll mail you a free S'more's Outdoors sticker to add to your rig. No cost, no catch — your email and mailing address are used only to send your sticker — we do not keep or share either one afterward.

About S'more's Outdoors

S'more's Outdoors builds small, free, ad-supported tools for the RV and van-life community — no accounts, no subscriptions, just things that are useful when you're parked for the night.