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Estimate exact paint and coating requirements for residential, commercial, and industrial projects in Kenya and East Africa. Accounts for room perimeter, door/window deductions, surface porosity, manufacturer TDS spread rates, and standard commercial pack sizes.
Choose the structural surface you are measuring for painting or coating.
Standard door: 0.9 × 2.1 m (~1.89 m²)
Standard window: 1.2 × 1.2 m (~1.44 m²)
Typical architectural wall emulsion yields 8–12 m²/L per coat on smooth walls.
Use the coverage rate stated on your paint tin or manufacturer Technical Data Sheet (TDS).
Follow the coating manufacturer's dry film thickness (DFT) specification where applicable.
Sound, pre-sealed plaster or previous satin/matt paint. Minimal absorption (1.0×).
Wastage/overage helps account for application losses (roller/brush retention), cutting-in, surface variations and small touch-up reserves.
529.9 sq ft net
2 coats (10% contingency)
1 × 10L + 1 × 1L
* Surface absorption multipliers and overage factors are disclosed transparently to avoid double-counting.
Instant technical assistance: Our Nairobi technical team reviews coating specifications, BOQs, and site measurements.
Accurate paint estimation protects construction budgets from material shortages and costly surplus stock. In Kenya and East Africa, paint estimation follows standard quantity surveying (QS) principles: measuring gross structural area, deducting openings, multiplying by coat count, adjusting for substrate suction, and converting the required volume into available market packaging.
Litres Required = [(Net Area in m² × Coats × Surface Absorption Factor) ÷ Coverage (m²/L)] × (1 + Overage %)
Net Area: Gross wall or floor perimeter minus doors, windows, and fixtures.
Surface Absorption Factor: 1.0 for smooth pre-painted walls, up to 1.3 for unsealed masonry or rough render.
TDS Coverage: Theoretical spread rate published by the paint manufacturer.
Unlike simple online tools that assume flat numbers, our calculation engine integrates real-world site variables:
A standard Kenyan flush door measures 0.9m × 2.1m (1.89 m²), and a typical casement window measures 1.2m × 1.2m (1.44 m²). For an average 4-wall room with 1 door and 2 windows, openings account for ~4.77 m², saving almost half a litre of paint per coat.
Fresh cement plaster, roughcast render, or machine-cut stone absorbs significantly more liquid binder on the initial coat. Our engine applies an empirical surface factor without double-counting your contingency allowance.
Undercoats and alkali-resistant primers serve a completely different chemical function than topcoats. The calculator isolates primer requirements so your purchase list has distinct quantities for base coat and decorative finish.
You cannot buy 13.4 litres off the shelf in Kenya. Our deterministic optimization algorithm calculates the exact combination of standard packs (0.5L, 1L, 4L, 5L, 10L, 20L) that covers the requirement with minimal waste and minimum tins.
Every coating formulation has a specific spreading rate dictated by its volume solids percentage. High-quality trade emulsions in East Africa typically have higher volume solids (35–42%), yielding better opacity and higher spread rates per litre.
| Coating Type | Typical Spreading Rate (TDS) | Standard Coats | Commercial Pack Sizes (Kenya) |
|---|---|---|---|
| Interior Vinyl Matt / Silk | 10–12 m²/L | 2 Coats | 1L, 4L, 20L |
| Exterior Weather Guard Emulsion | 8–11 m²/L | 2 Coats | 1L, 4L, 20L |
| Epoxy Floor Topcoat | 5–7 m²/L | 2 Coats | 4L, 5L, 20L |
| Alkali-Resistant Primer / Undercoat | 9–11 m²/L | 1 Coat | 1L, 4L, 20L |
| Roof Coating / Waterproofing | 6–8 m²/L | 2–3 Coats | 4L, 20L |
* Note: Spreading rates shown are baseline industry benchmarks. Check the exact Technical Data Sheet (TDS) for your specific Sienna product.
Clear, verified answers regarding paint coverage, opening deductions, floor coatings, and pack optimization in Kenya.
Paint volume is calculated by multiplying the net paintable area by the number of coats and dividing by the theoretical spreading rate stated on the product Technical Data Sheet (TDS). Formula: Litres = (Net Area in m² × Coats) ÷ Coverage (m²/L). Add a 5–10% contingency factor for application losses and touch-ups.
A typical Kenyan master bedroom measuring 5m × 4m with a 2.8m ceiling height has approximately 50.4 m² of gross wall area. After subtracting one standard door (1.89 m²) and two windows (2.88 m²), the net wall area is approximately 45.6 m². At standard 2 coats and 10 m²/L coverage, you will need approximately 10.0 Litres (one 10L tin or one 20L tin if also painting the ceiling).
For a 100 m² surface requiring 2 coats of paint with a standard coverage of 10 m²/L, you will need 20.0 Litres of finish paint. With a 10% overage contingency for cutting-in and roller absorption, the total recommended purchase is 22.0 Litres (one 20L drum plus one 4L tin or two 1L tins depending on supplier stock).
An average 3-bedroom bungalow in Kenya (approx. 110–130 m² plinth area) typically has between 320 m² and 420 m² of interior wall surface, plus approximately 110 m² of ceiling area. Interior walls generally require 75–90 Litres of finish emulsion (four to five 20L drums) across 2 coats, plus 20–25 Litres of ceiling matt, and 35–45 Litres of plaster primer/undercoat if surfaces are new plaster.
Coverage varies depending on product formulation and substrate porosity. Most premium interior emulsions (silk, vinyl matt) cover 10–12 m²/L per coat on smooth, sealed plaster. Textured exterior finishes and porous unpainted masonry typically cover 6–9 m²/L per coat. Always verify against the manufacturer Technical Data Sheet (TDS).
Yes. In Room and Wall calculation modes, the calculator allows you to enter the number of doors and windows. It automatically deducts these openings from the gross surface area using standard Kenyan architectural opening dimensions (0.9m × 2.1m doors and 1.2m × 1.2m windows) or custom opening dimensions.
Yes. Select Floor / Epoxy mode and enter the length and width of the concrete slab. Standard high-build floor epoxies and polyurethane coatings yield 5–7 m²/L per coat depending on concrete surface profile (CSP). Floor coatings also benefit from a penetrating epoxy primer.
The result is a professional theoretical estimate. Actual field consumption is influenced by substrate porosity, surface texture, application tools (spray, roller, or brush), painter technique, and ambient drying temperatures. We recommend ordering the calculated commercial pack combination to ensure batch colour consistency.
For commercial buildings, industrial flooring, or large housing estates across Kenya, our technical team conducts site moisture tests, substrate profiling, and Bill of Quantities (BOQ) verification.