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100% browser-based · no account · instant answers

Plan your van conversion,
without the guesswork

Six free calculators built for van and camper conversion builders: size your electrical system and solar array, calculate fresh and grey water tank capacity, work out insulation material and R-value, keep your build weight inside GVWR, estimate total build cost, and plan your interior floor layout.

Battery & solar sizingWater tank capacityGVWR weight budgetFree forever
Van Electrical System SizerEnter your devices' wattage and daily hours of use to see your total daily power draw, recommended battery bank size in Ah, and the solar panel wattage needed to recharge it.Van Fresh & Grey Water Tank CalculatorEnter occupants, days between refills and daily water use per person to size your fresh water tank and estimate the grey water tank capacity you'll need.Van Insulation Material CalculatorEnter your van's wall, ceiling and floor surface area and choose an insulation material and thickness to calculate material needed and the R-value you'll achieve.Van Weight Budget Calculator (GVWR)Enter your van's base weight, GVWR limit, and the weight of your conversion additions to see remaining payload and whether your build is over budget.Van Conversion Build Cost EstimatorEnter your cost per category — insulation, electrical, water, furniture, flooring, windows and labor — to see total build cost and compare DIY against hiring a professional.Van Interior Layout Space PlannerEnter your van's interior floor dimensions plus your bed, kitchen and storage footprints to see floor area used, remaining open space, and whether the layout fits.

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Plan the whole conversion, not just one system

Start with the van electrical system sizer to size your battery bank and solar array, then the fresh & grey water tank calculator to match your water capacity to how long you'll be off-grid. The weight budget calculator keeps every addition inside your GVWR, and the build cost estimator puts a number on the whole project before you buy a single panel.

More tools

Van Electrical System SizerEnter your devices' wattage and daily hours of use to see your total daily power draw, recommended battery bank size in Ah, and the solar panel wattage needed to recharge it.Van Fresh & Grey Water Tank CalculatorEnter occupants, days between refills and daily water use per person to size your fresh water tank and estimate the grey water tank capacity you'll need.Van Insulation Material CalculatorEnter your van's wall, ceiling and floor surface area and choose an insulation material and thickness to calculate material needed and the R-value you'll achieve.Van Weight Budget Calculator (GVWR)Enter your van's base weight, GVWR limit, and the weight of your conversion additions to see remaining payload and whether your build is over budget.Van Conversion Build Cost EstimatorEnter your cost per category — insulation, electrical, water, furniture, flooring, windows and labor — to see total build cost and compare DIY against hiring a professional.Van Interior Layout Space PlannerEnter your van's interior floor dimensions plus your bed, kitchen and storage footprints to see floor area used, remaining open space, and whether the layout fits.

Frequently asked questions

Is VanKit really free, with no account needed?

Yes — every calculator runs entirely in your browser with no sign-up, no data collection and no cost. Nothing you type is sent to a server.

Who is VanKit built for?

Anyone converting a van, minibus or similar vehicle into a camper — from a first-time weekend build to a full-time live-in rig — who wants a clearer handle on power, water, insulation, weight and cost before they start cutting and drilling.

Are the default values realistic for every van?

They're realistic, generic starting points based on common mid-size van conversions — but every van's dimensions, GVWR, climate and intended use differ, so always swap in your own vehicle's real figures and your own device and material specs.

Can these tools replace an electrician, plumber or weighbridge?

No — they're planning and estimation tools, not electrical, plumbing or engineering certification. For a system that will keep you safe and legal on the road, verify wiring, gas and weight against local codes and get the finished build weighed and, where required, professionally inspected.