CCTV Coverage Calculator.
Building parameters in, indicative camera count, retention storage and recording bandwidth out. Sized to NBC and IS-grade specifications across 8 sectors.
- Sectors
- 8
- Output
- Indicative
- Codes
- NBC + IS
- Retention
- 30 days
— Coverage · storage · bandwidth · IS 14935 / IEC 62676-4 informed
Surveillance, sized to the building.
Camera density from our planning conventions for each sector, H.265 bitrate per resolution, with IS 14935 / IEC 62676-4 surveillance and NBC Part 4 life-safety practice in view. Tier forces enterprise VMS for healthcare + mall by default.
Premium consultation · Commercial NVR
62 cameras · 95.8 TB
56 interior + 6 perimeter, recording H.265 at 155 Mbps total across a 60-day retention window.
Camera count
62
56 interior · 6 perimeter
Retention
60 days
Hotel / hospitality default
Recording storage
95.8 TB
RAID-5 on internal bays
Recording bandwidth
155 Mbps
H.265 / continuous record
- NVR / VMS units2 × 32-ch
- Head-end class32-ch commercial NVR
- Storage architectureRAID-5 on internal bays
- PoE per cameraIEEE 802.3at / bt class
Assumptions driving this recommendation↓ expand
- Camera density
- 7 per 1000 m²
- Density basis
- Planning convention — project experience
- Codec
- H.265 smart-codec design rate (ITU-T H.265)
- Bitrate (4 MP)
- 2.5 Mbps (planning average)
- Bitrate (8 MP)
- 4.0 Mbps (planning average)
- Bitrate (ANPR)
- 3.5 Mbps (planning average)
- PoE per camera
- IEEE 802.3at / bt class
- Storage retention
- 60 days — sector / insurance norm
- Critical sector forces tier
- No
Operationally sensible ecosystem
Brands grouped by engineering role — not random logos.
IP cameras
Cameras + analytics edge
- Hanwha WisenetKorean enterprise vendor
- Bosch IPEuropean optics + analytics
- Hikvision ProMid-tier Hikvision product line
Video management
VMS / NVR / command-centre
- Hanwha Wisenet SSMEnterprise VMS
- Genetec Security CenterOpen-platform VMS
Access control
Readers + controllers + credentials
- HID SignoReference HID reader line
- Honeywell Pro-WatchMid-enterprise ACS
Indicative planning sizing only — camera count, storage and bandwidth are concept-level figures, not a final design, BOQ or layout. Camera density is a planning convention from project experience (IS 14935 / IEC 62676-4 set image-quality and application practice, not a fixed cameras-per-area figure), retention follows sector / insurance norms, codec is ITU-T H.265 and PoE follows IEEE 802.3 classes. Bitrates here are smart-codec planning averages; a per-model storage estimate lives in the CCTV Storage Retention calculator. A site survey, AHJ review and consultant sign-off refine camera count, mount locations, IR throw, lens FoV and resolution per zone. Pricing follows a written estimate after technical review.
Translate into a briefPricing · written estimate after review
Need a price for this scope?
Share your drawings, BOQ or project brief on WhatsApp/call +91 88110 34444 or email info@technoguru.in for a written estimate after review. Pricing depends on drawings, site conditions, system scope, brand selection, cabling stage, integration depth, commissioning, logistics, GST, approvals and support expectations — so we prepare it per project after a technical review rather than publishing standard rates.
Budget the PoE for these cameras· Engineering advisory · CCTV Coverage Calculator
What the camera count predicts about the surveillance estate.
The recommended camera count is the brief-stage budget. The deployment requires the lens-and-mount geometry walkover, the per-camera bitrate measurement and the operator-room handover discipline below.
Deployment observations
- Camera count is the BOQ answer; coverage at the witnessed PPM band is the engineering answer. Identification (250 PPM), recognition (125 PPM) and observation (62 PPM) bands taper with distance — a 50-camera estate may deliver identification across only 18% of the floor plan if the lens-and-mount choice is uniform.
- Per-camera bitrate budgeting against the procurement-stage 2 Mbps default is the leading silent under-spec; H.265 main-profile cameras burst to 6 Mbps in busy lobbies and to 9 Mbps in heavy-motion zones. Storage runs out at 18 days when the spec said 30.
- PTZ cameras carry a 5-7 year service envelope but their preset-recall library is the operational deliverable — patrol presets, alarm presets and operator-recall presets are part of the commissioning hand-over, not an aftermarket configuration exercise.
Redundancy posture
- NVR hot-spare discipline matters more than camera spare count — a failed camera affects one viewpoint, a failed NVR affects 16-64 viewpoints. The AMC inventory holds a named replacement NVR per VMS cluster, not a generic camera-spares pool.
- RAID layout on each NVR (typically RAID-5 or RAID-6) holds through single-disk failure; the AMC inventory holds named replacement disks per NVR class for hot-swap with the existing array preserved.
- VMS service architecture is local-first, supervisor-aggregated — recording continues on each NVR even if the central VMS service is offline. Multi-NVR VMS recovery is a service restart with no data loss.
Environmental considerations
- Outdoor camera enclosures (IP66/67) carry an enclosure-seal refresh on the AMC calendar — every 12-18 months under monsoon exposure, every 24-30 months under dry-climate exposure. Condensation-fog on the lens face is the leading failure mode.
- IR illuminator range bounds night PPM — a 30 m IR-range bullet camera delivers identification PPM at 5-8 m only, recognition at 10-15 m and observation past that. Day PPM and night PPM are separate measurements at commissioning.
- Hilltop and high-wind sites require pole-foundation calculations beyond the catalogue baseline — pole tilt corrupts plate-read accuracy for ANPR and IR coverage for night vision. Foundation depth and rebar profile is specified per pole.
Commissioning discipline
- Per-camera PPM witnessed measurement at commissioning — operator walks a 100-target witness set across day, dusk, night-IR and monsoon profiles for outdoor; the lens and electronic-iris settings are locked against the witnessed profile.
- Patch-panel and PoE port mapping handed over against the architectural floor plan — every camera replacement five years from now is a port-and-cable trace from the architect's drawing, not from a vendor's internal numbering.
- Privacy-zone register (NABH for hospitals, DPDPA for any IT-act-bound facility) is annotated against the camera placement at handover — every camera placement has a written privacy justification that survives an audit.
Lifecycle implications
- PoE camera fleets carry a 6-8 year service envelope under indoor exposure, 5-7 years under outdoor exposure; replacement is like-for-like ONVIF on the existing Cat6 + PoE plant.
- Storage HDDs in the NVR carry a 5-6 year service envelope under continuous capture; the AMC schedule holds a hot-spare disk per NVR class for cold-swap with the existing RAID layout preserved.
- VMS firmware refresh is a configuration baseline export-and-restore exercise; named alarm rules, recording schedules and operator preferences are exported offline before any firmware update and re-loaded after verification.
Expansion readiness
- Camera count expansion (10-20%) typically lives within the existing NVR channel budget and PoE switch port count; beyond that, a new NVR plus a new PoE switch is the minimum incremental scope.
- Analytics-class upgrade (ANPR, face-search, line-cross) from baseline 4 MP is a per-camera and a per-NVR licence exercise on the existing cable plant; AI-class analytics typically require an upgraded NVR class with on-board GPU.
- Multi-site VMS aggregation across geographically separate facilities is supported on most Honeywell and Hikvision VMS classes; the addition is a captive-portal credential exchange and a federation configuration, not a re-cabling exercise.
· Example use
A 70-bed hospital across six floors with two perimeters lands on roughly 110 cameras at 4 MP, 30 days retention, around 220 TB of recording storage and a switching backbone with 30 percent PoE headroom. The coverage and storage land in a defensible band before any vendor walks in. The same building specced casually goes wrong by 30 cameras either way.
· Frequently asked
CCTV coverage —
what people ask first.
Why design to NBC and IS codes?
NBC 2016 Part 4 and the IS 16910-1 surveillance code define the floor — minimum coverage, retention and grade-of-design for life-safety-relevant areas. Anything below is non-compliant; anything above is a design choice. The calculator never drops below code.
How accurate is the camera count?
It is a brief-stage count, not a final camera schedule. The calculator uses field-of-view and overlap rules that match common layouts; stairwells, lift lobbies, exterior corners and privacy zones still need a real walkover before the drawing is issued.
Does it account for low-light and high-contrast scenes?
Yes — entrance lobbies, parking ramps and outdoor courtyards trigger the WDR and starlight specifications. Indoor offices and corridors use standard 4 MP fixed-lens cameras unless you flag a special use.
What about analytics and ANPR?
Both are optional layers. ANPR cameras need dedicated lanes; people-counting and intrusion-analytics need higher resolution and specific mounting. The tool flags the upgrade band; the design conversation defines the count.
Which brands do you specify?
Hikvision and Dahua for value, Axis and Bosch for premium and defence-adjacent, Hanwha and Avigilon for analytics-heavy estates. We are brand-agnostic at concept stage and brand-specific at BoQ stage — chosen on use case, not on margin.
· Begin
Specifying CCTV
for a real building?
Send the floor plates, the operating context and the retention requirement. We will return a sized design within two working days; pricing follows a written estimate after review.