Can I use my phone as an RV level?

Yes. Open the free level at bubblelevel.io in your browser — it reads both axes at once to 0.1°. Calibrate it once on a surface you trust, then lay the phone on the trailer floor or a counter.

Where should I put the level inside an RV?

Somewhere that reflects what you care about: the fridge floor or freezer shelf is the classic spot, or the kitchen counter. Avoid surfaces that flex, like dinette tables and bed platforms.

Can I level my trailer with the stabilizer jacks?

No. Stabilizer jacks are only meant to stop the trailer rocking once it's already level — using them to lift can bend the jacks or the frame. Level side-to-side with blocks under the wheels and front-to-back with the tongue jack.

How many leveling blocks do I need?

On a typical 8-foot-wide rig, each degree of side-to-side tilt equals roughly 1.5–2 inches of height on the low side. A standard 10-pack of stackable blocks covers most sites; doubling as ramps, they also stay under the tires' full footprint.

What if the site slopes too much front to back?

If the tongue jack runs out of travel, re-park with the nose pointing downhill (jacks extend further than they retract), put blocks under the jack foot, or pick a different pad. Never run the fridge while the rig is badly off-level.

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How to level a camper or RV

Updated July 3, 2026 · 20 minutes at the campsite

Leveling isn't just about sleeping without rolling into the wall. Doors swing themselves open or refuse to latch, tank sensors lie, slide-outs bind — and most importantly, an absorption fridge run off-level for long enough can be permanently damaged. The good news: with the right order of operations it's a 20-minute routine, and your phone is the only level you need.

Open the free bubble level
Reads both axes at once, 0.1° readout — no app install.

The golden rule: side-to-side first, front-to-back second. Side-to-side is done with blocks under the wheels, which means driving — and you can't drive after you've unhitched. Get the order wrong and you'll be re-hitching in the dark.

Step by step (travel trailer)

Park and measure. Pull into the pad roughly where you want to end up. Lay your phone flat on the trailer floor or kitchen counter and read the side-to-side number.
Convert degrees to blocks. On a typical 8-foot-wide rig, each degree of tilt is roughly 1.5–2 inches of height on the low side. Reading 1.5° low on the left? Start with a ~3-inch stack under the left wheels.
Drive the low side onto blocks. Stack the blocks as a ramp just ahead of (or behind) the tires, drive on slowly, re-check the level, and adjust. With tandem axles, block both wheels on that side.
Chock — before you unhitch. Chock both sides of the tires, firmly. The trailer is now allowed to exist without the truck.
Unhitch, then level front-to-back. Raise or lower the tongue jack while watching the level (this is where a second person calling out numbers is lovely, but the big readout works solo too). Stop at 0.
Stabilizers last — and snug only. Lower the stabilizer jacks until they take a little weight and stop the wobble. They are not leveling tools: lifting the trailer with them can bend the jacks or the frame.
Verify where it matters. Final check with the phone on the fridge floor or freezer shelf — the fridge is the appliance that actually cares about all this.

Motorhomes

Same physics, different tools. If you have hydraulic auto-leveling, park roughly level so the system works within its range (and so wheels stay firmly planted). Manual rigs level with blocks under the wheels, exactly like a trailer — verify inside with the phone level either way.

FAQ

How level does an RV fridge need to be?

Within about 3° side-to-side and 6° front-to-back while running is the common manufacturer guidance — persistent operation beyond that can wreck the cooling unit. Parked at camp, just make it level.

Can my phone really replace an RV level?

Yes — this free browser level reads both axes at once, which is exactly what you want while driving onto blocks. Calibrate it once at home on a surface you trust.

Where do I put the level?

The fridge floor or freezer shelf is the classic spot; the kitchen counter works. Avoid flexy surfaces.

Can I level with the stabilizer jacks?

No — stabilizers stabilize. Lifting with them risks bending the jacks or the frame.

How many blocks should I carry?

A 10-pack of stackable blocks covers most sites; each degree of tilt ≈ 1.5–2" of stack on an 8-foot-wide rig.

What if the site slopes too much?

Re-park nose-downhill, block under the tongue-jack foot, or choose another pad. Don't run the fridge badly off-level.