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 signup

Free tools for RV, van, & overland life

Calculators, campsite finders and trip planners — plus an open camper conversion documented down to what every part cost. No accounts, no email gates, nothing held back for a signup.

The build

A real conversion, documented as it happens — including the parts that did not work.

Build log · in progress Project S'mores — our 4th-gen Sienna camper build A no-drill conversion of a fourth-generation Toyota Sienna (2021–present), built in the open: the modular platform design, progress as it happens, shop photos, and every part with what it actually cost. Follow the build →

Plan a trip

Work out where to go, whether your rig fits, and what to buy before you leave.

Find a Campsite That Fits A tailgate tent means the van parks at the tent, which rules out more sites than people expect. Size your setup, see it drawn overhead, then search about 2,400 federal campgrounds for sites that take it. Size it and search → Where to Van Camp Pick what you want to do — hiking, paddling, climbing, history — and find the small, quiet federal campgrounds near it. Ranked away from the big-RV parks. Find somewhere → Camp Near the Big Events The Derby, Daytona, Sturgis, state fairs. Event campgrounds fill up and charge for it — this finds the quiet federal ones within driving distance. Find a base camp → Camp Food & Supply Planner How much food, water, ice and fuel to actually buy. Counts real meals from when you arrive and leave — a two-night weekend is six or seven meals, not nine — and only suggests what your cooking gear can make. Plan the shop →

Free calculators

Enter your numbers, get your answer, get back outside. No account — and every one of these is stored on your device after the first visit, so they keep working at a campsite with no signal.

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.

Help shape it

The tools here exist because people asked for them.

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 is a small, free site for the RV, van and overland community — no accounts, no subscriptions, nothing gated behind an email. It started as a handful of calculators built mid-conversion, because the answers were not online. It now also carries the Project S'mores build log and its free 127-page plan, guides, and whatever else the build turns up.

If something here is wrong, say so — the numbers come from a real conversion, and corrections are welcome.