RV leveling calculator
Lay your phone on the floor of your RV, camper or van. It shows which side is low, how much to raise each wheel and how many leveling blocks to stack. No app needed.
Phone flat on the floor near the middle, top of the phone pointing to the front of the vehicle.
No sensor? Enter the angles from a level
Built by Nitin Raja ·
How to level an RV or camper with your phone
Leveling your RV keeps doors from swinging on their own, makes the bed comfortable, keeps water draining the right way and lets an absorption fridge work properly. A bubble level shows you which way the rig leans, but not how much to raise it. This page uses your phone's tilt sensor as a digital level and turns the angle into a number: how many inches to lift each wheel, and how many leveling blocks that takes.
Step by step
- Park on the flattest spot you can find, and note your track width (the distance between the left and right wheel centres, usually 6 to 7 feet) and, for a motorhome or van, the wheelbase.
- Tap Start and allow motion access. Lay the phone flat on the floor near the middle of the vehicle, with the top of the phone pointing to the front.
- Read the result. The page shows how much to raise the low side, or for a motorhome, each corner. Tap Hold reading before you pick the phone up.
- Stack the blocks in front of (or behind) the wheels to be raised, drive or tow onto them slowly, and check again.
- Travel trailers: once side to side is level, chock the wheels, unhitch and use the tongue jack for front to back.
How the numbers are worked out
A tilt of a few degrees over the width of the RV is a measurable height difference: the lift equals the track width times the tangent of the angle. For example, a 1.5 degree lean across 82 inches is about 2.1 inches. You cannot stack part of a block, so the page rounds up: three 1-inch blocks under the low side. For motorhomes, the page fits a flat plane through all four wheels and works out the lift for each one so that the lowest corners come up to the highest.
Get a true zero
Phones are not perfectly flat on their backs: cases and camera bumps add a small tilt. Put the phone on a surface you know is level (checked with a bubble level) and tap Set zero. The page remembers that offset on this phone.
Safety
Only use blocks rated for your vehicle's weight, follow the stacking limits on the packaging, put blocks on firm ground, and always chock the wheels before unhitching or working around the RV. Leveling jacks and stabilisers are not designed to lift the weight of the vehicle off its wheels unless the manufacturer says so.
Why we built this RV leveling calculator
A bubble level tells you which way an RV leans, but not how much to lift it, and that is the question when you are holding a stack of leveling blocks. The answer depends on the angle and on how far apart the wheels are: the same 1.5 degree lean needs more lift on a wide fifth wheel than on a narrow campervan. Motorhomes add a second problem, because a lean front to back and side to side at the same time means each wheel needs a different lift.
Your phone's tilt sensor reads the angle, and the rest is trigonometry. We built the page to do that arithmetic for you and turn it into whole blocks per wheel.
What this RV leveling calculator measures
With the phone lying flat, top pointing to the front of the vehicle, the code reads the motion sensor and averages it over 0.8 seconds. Side-to-side tilt (roll) comes from the left-right reading, positive when the right side is low; front-to-back tilt (pitch) from the front-back reading, positive when the front is high. Then:
- Set zero stores the phone's offset on a surface you know is level, in this browser only, and subtracts it from every reading.
- Travel trailer or fifth wheel: lift for the low side = track width x tan(roll); if you enter the hitch-to-axle length, the tongue jack change = that length x tan(pitch).
- Motorhome, campervan or truck camper: a flat plane through the measured tilt gives the height of each wheel at plus or minus half the track width and half the wheelbase; each wheel is raised to the highest one.
- Blocks = lift / block thickness, rounded up to the next whole block (at least one), because you cannot stack part of a block.
No sensor? Type the two angles from any level and the same maths runs. Last checked 24 October 2026. What it does not measure: the ground under each wheel (soft ground lets blocks sink), a slope that changes under the vehicle, the weight rating of your blocks or jacks, or your fridge maker's own tolerance.
Why this RV leveling calculator is different
- Amounts, not just a bubble: lift and block count for each wheel, in inches or centimetres.
- Four wheels for motorhomes, from one reading, using a plane fit.
- A zero offset for phone cases and camera bumps, remembered on your phone.
- Hold reading, so you can pick up the phone and walk to the wheels.
- It starts empty. No sample measurements are filled in, and nothing is calculated until you enter your track width and take a reading or type the angles.
- No app, no account, and a manual mode for computers. The address bar keeps your measurements and typed angles, so a copied link opens with the same result.
Measuring something taller? Try the tree height calculator, which uses the same tilt sensor.
Questions
How do I level my RV with my phone?
Open this page on your phone, tap Start and allow motion access. Lay the phone flat on the floor in the middle of the RV with its top pointing to the front of the vehicle. Enter how far apart your wheels are, and the page shows which side is low, how much to raise each wheel, and how many leveling blocks that is.
How accurate is a phone as an RV level?
A phone's tilt sensor is usually accurate to a few tenths of a degree, which is plenty for leveling a camper (fridges and comfort need roughly within 1 to 2 degrees). Phone cases and camera bumps can add a small offset, so use "Set zero" once on a surface you know is level, such as a kitchen counter checked with a bubble level.
How level does an RV need to be?
For sleeping and comfort, within about 1 degree side to side feels level. Absorption fridges in older RVs need to be close to level to run properly; check your fridge manual. Many owners aim to get the bubble centred within half a degree.
How many leveling blocks do I need?
Divide the lift by the thickness of one block. Most interlocking blocks are about 1 inch (2.5 cm) thick. The page rounds up to the next whole block, because you cannot stack part of one (a 2.1 inch lift with 1 inch blocks is three blocks), and tells you how many to stack under each wheel. Never stack more than the manufacturer allows, and drive on slowly with someone guiding.
What is track width and wheelbase?
Track width is the distance between the centres of the left and right wheels on the same axle, usually 6 to 7 feet on RVs. Wheelbase is the distance between the front and rear axles. For a travel trailer you only need the track width; the tongue jack handles front to back.