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Sync settings

Choose what your account keeps in step on every device where you are signed in.

  • My tools

    Always synced: the tools on your board, their order and size.

  • The windows open on your start page, including what you typed in them.

  • Every note in the notepad – on the notepad page, on your board and in windows.

  • Every list of website shortcuts – on the shortcuts page, on your board and in windows.

  • Every grid in the cover grid maker – on its page, on your board and in windows.

  • Every list of bookmarked organisations in the OIN lookup – on its page, on your board and in windows.

  • Keeps your pipeline and saved recipes on all your devices. Your files are never synced – only the steps and settings.

Turning something off removes it from your account straight away. Your devices keep their own copy.

Notifications

Tools that can tell you about something new while a Synsi tab is open, even when you are in another tab or app. Choose them for this browser.

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  • Says “New message” while a Synsi tab is open – never who wrote it or what.

Your choice is stored in this browser only. Notifications never show personal content such as a message or a number. They work while a Synsi tab is open; closed tabs get none.

Browse all tools →

Home & DIY

Estimate the materials, energy and measurements you need for everyday home improvement projects.

Paint Calculator

Estimate wall area and the paint needed for one or more coats, including an allowance for paint lost to spills and touch-ups.

Flooring Calculator

Estimate the floor area for one or more rooms, add a cutting-waste allowance and calculate how many flooring packs to buy.

Tile Calculator

Calculate the number of floor tiles and boxes needed from room size, tile dimensions, box quantity and a cutting-waste allowance.

Concrete Calculator

Estimate concrete volume and the number of ready-mix bags for a rectangular slab, footing or post base.

Gravel Calculator

Estimate the gravel volume for a rectangular area from its length, width and planned depth, with an optional extra allowance.

Mulch Calculator

Work out the volume of mulch needed to cover a garden bed at your chosen depth, including an optional extra allowance.

Soil Calculator

Estimate the amount of topsoil or garden soil needed to fill a rectangular bed or raised planter.

Wallpaper Calculator

Estimate wallpaper rolls from wall dimensions and roll size, with extra material for matching a repeating pattern.

Roofing Calculator

Estimate roof covering area from roof length, sloped length, roof sections and a waste allowance.

BTU Heating Calculator

Estimate the heating output in watts and BTU per hour from room floor area and an adjustable heat-load assumption.

Air Conditioner Size Calculator

Estimate a room air conditioner size in BTU per hour and cooling tons from room area, sun exposure and occupancy.

Electricity Cost Calculator

Estimate monthly energy use and electricity cost for an appliance from its wattage, daily use and your price per kilowatt-hour.

Solar Panel Calculator

Estimate a solar array size and panel count from monthly electricity use, peak sun hours, system efficiency and panel wattage.

Water Tank Calculator

Calculate the capacity of a rectangular or cylindrical water tank from its internal dimensions.

Room Area Calculator

Calculate the floor area and combined perimeter for one or more rectangular rooms in metric or imperial units.

Practical calculators for home projects

Planning a renovation or garden project starts with a few measurements. These calculators help estimate paint, flooring, tile, concrete, gravel, mulch, soil and wallpaper, and make quick checks for room area, roofing, heating, air conditioning, electricity, solar panels and tank capacity.

Treat material quantities and energy sizing as planning estimates. Room shapes, product coverage, installation waste, building insulation and local codes can change what you need. Check product specifications and consult a qualified professional before ordering materials or sizing a heating or electrical system.