Как измерить комнату под покраску (и точно посчитать сколько краски)
Площадь стен минус двери и окна, умножить на слои, разделить на покрытие. Получите число, которое скажет, сколько банок купить, и никогда не купите слишком мало.
Покупка краски, место, где сыпятся DIY-бюджеты. Либо берёте слишком много (на свалку), либо не хватает посреди работы (вторая поездка, проблемы с подбором цвета). Математика проста: площадь × слои ÷ покрытие. Сложно правильно посчитать площадь, здесь большинство ошибается. iPhone решает за 90 секунд.
Зачем замерять
- Avoid buying excess paint that goes to waste
- Avoid running out mid-job and re-mixing colors
- Get accurate per-room cost for budgeting
- Compare paint brand pricing on a like-for-like basis
Что нужно
- iPhone with Ruler AR (LiDAR optional but speeds it up)
- Room Scan (LiDAR) or Manual Room Builder
- Material Calculator in the app
Пошагово
- Measure the room outline. Open Ruler AR → Room Scan (LiDAR) or Manual Room Builder (any iPhone). Walk the perimeter; the app builds the floor plan automatically. Save as a project named "Room, Paint".
- Ceiling height. Use Height mode. Tap floor to ceiling. Most rooms 240-260 cm. Older houses 280-300 cm. New builds often 240 cm exactly.
- Subtract doors and windows. In the saved project, the app already detected doors and windows (LiDAR) or you added them in the manual editor. Each one is excluded from paintable area automatically.
- Wall area calculation. Wall area = floor perimeter × ceiling height − sum of door areas − sum of window areas. Tap Material Calculator in the project → Paint. The app calculates it.
- Set coats and coverage. Most paints state coverage in m²/L on the tin. Default is 10 m²/L per coat. Two coats is standard for fresh painting; three for going from dark to light. Adjust in the Material Calculator.
Советы
- Always add 5-10% for touch-ups and small mistakes
- Ceiling and walls use different paint (ceiling is matt to hide imperfections; walls are washable matte/eggshell)
- Buy from one production batch, color can vary slightly between batches
Типичные ошибки
- Measuring just the floor area, paint covers walls, not floors
- Forgetting to subtract doors and windows (saves 5-15% of total paint)
- Using single-coat coverage when two coats are needed, always read the tin
Частые вопросы
How many litres of paint per coat per 10 m²?
Roughly 1 litre per 10 m² for one coat on a smooth wall. Textured surfaces (stipple, stucco) use 30-50% more.
Do I need two coats?
Almost always yes. One coat looks streaky and shows brush marks. Exceptions: going from one shade of white to a similar white might work in one coat.
How much does ceiling paint cover?
Same as wall paint (10 m²/L typical). Ceiling area equals floor area for flat ceilings. Vaulted or sloped ceilings: use the actual surface area.