S'more's Outdoors
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Home RV Leveling Block Calculator Can I Tow It? How Long Can We Boondock? Propane Tank Duration Calculator Will It Trip the Breaker? Camper Power & Climate Planner Tire Pressure by Axle Weight RV Winterization Antifreeze Calculator Will My Rig Scrape?
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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. Every tool works offline after your first visit while online (see the “Works offline” badge above), and results can be saved as a PDF or shared by link.

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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 → 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 → 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 → 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 → 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 → 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 →
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.

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.