Motion Sensor Coverage Calculator
A PIR motion sensor watches a fan-shaped wedge — a sector of a circle set by its reach and its detection angle. Enter the room and the sensor to estimate the floor area one sensor covers, what share of the room it sees, and how many motion sensors the room needs. Planning figures; runs in your browser.
Planning estimate only — real PIR coverage is line-of-sight and is cut short by walls, furniture and glass. Overlap the wedges at room corners, mount away from AC vents and direct sun to cut false triggers, and always walk-test. Verify reach and angle against the product datasheet before you buy.
Plan the whole detection layer
Related Guides — Deep-dive reading
Motion Sensors for Home Security in India (2026): The Complete Guide
The umbrella guide to indoor motion detection: how PIR, microwave, dual-technology and ultrasonic sensors work, where to place them in an Indian home, and how good placement designs out false alarms from fans, AC, heat and pets.
SecurityBeam Sensors in India (2026): Active-Infrared Perimeter Detection for Gates, Walls and Farmhouse Boundaries
How active-infrared beam sensors work, where they earn their place on Indian plots, single-beam versus multi-beam towers, and how to tame the outdoor false-alarm problem with sound design.
SecurityBurglar Alarm Installation in India: Planning, Wiring & Commissioning (2026)
A room-by-room guide to installing a home burglar alarm: where the panel, keypad and siren go, how sensors are placed per zone, wired versus wireless mounting, power and battery backup, GSM SIM, then walk-testing and handover.
SecurityRelated Tools — You may also find these useful
Alarm Battery Backup Calculator
Size the standby battery for a burglar-alarm panel so it rides through a mains cut and still drives the sirens. Enter the quiescent and alarm currents, the required hold-up time and the battery chemistry for the amp-hours to fit. A planning estimate; test under load.
Battery SizingAlarm Zone Planner
Group your alarm sensors into panel zones so you can see where a trigger came from and arm the perimeter at night while you sleep inside. Enter the sensor count and grouping style to size the zones and the panel. A planning aid; label every zone.
Alarm ZonesFalse Alarm Risk Assessment
How likely is your alarm to cry wolf? Toggle known false-alarm causes — pets, sensors near vents, single-tech detectors, no entry delay — for a red / amber / green risk score and the fix for each. Persistent false alarms can get your monitoring response suspended.
False-Alarm Risk