Door Air Leakage Calculator
Enter the door size, the gap / seal quality and how many external doors you have — and see the conditioned air that leaks out and the rupees it wastes each year, plus how good seals cut it. Indicative India 2026 bands — not a blower-door test.
Your doors
No gasket, visible daylight at the bottom and sides; biggest draughts. Crack length ≈ 6.3 m per door (perimeter of a 1.05 × 2.1 m leaf). Leakage and ₹ are indicative bands assuming ~1600 AC hours/yr and a split-AC COP of 3 — a real figure needs a blower-door / air-tightness test.
Conditioned air wasted per year
₹0
≈ 113 m³/h of air leaks out across 2 doors · 302 kWh/yr
₹ / year now
₹2,419
Savings w/ seals
₹2,097
per year
Payback
1.6 yr
seal retrofit
- Current seals₹2,419/yr
- With good seals₹323/yr
- Seal retrofit ≈ ₹3,304 for 2 doors (incl. 18% GST ₹504).
Sealed vs unsealed annual waste. Indicative — confirm with an energy consultant.
Seal the draughts, keep the cool
DesignAI can suggest the right weatherstripping, bottom seals and airtight door upgrades for your climate — and sense-check the payback.
Assumptions
Air leakage is estimated from crack length (door perimeter) × an indicative leakage coefficient per metre set by seal quality, at a typical wind-plus-stack operating pressure. The rupee figure assumes about 1600 air-conditioned hours a year, an enthalpy difference of ~18 kJ to re-condition each cubic metre of hot, humid outdoor air, a split-AC COP of 3, and your electricity tariff. The seal-retrofit budget (gaskets + a drop-down bottom seal) includes 18% GST; the energy figure is the metered electricity it wastes.
These are indicative estimates, not measurements — real infiltration depends on your home's pressure regime, door fit and weather. Confirm with a blower-door / air-tightness test and a qualified energy consultant; refer to Eco-Niwas Samhita (ENS) 2018 and ECBC 2017 for envelope air-tightness guidance. This tool does not certify performance or replace a manufacturer EPD.
Related Guides — Deep-dive reading
Door Air-Tightness & Infiltration Control (India 2026)
How gaps around a door leak conditioned air, dust and noise, the air-permeability classes that matter, and how seals cut infiltration.
Home Doors & EntrancesDoor Draught-Proofing Performance: Air Leakage (India 2026)
How to measure and rate how well a door resists draughts and air leakage, what good looks like in m3/h.m2 at 50 Pa, and the AC-efficiency and comfort payoff.
Home Doors & EntrancesGap Under Door Fix: Seal the Bottom Gap (India 2026)
Why the gap under your door matters and the ranked fixes — sweeps, draught excluders, threshold strips and drop seals — with prices and steps.
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