Make better floor decisions
Check rack power, breaker headroom, phase imbalance, feeder voltage drop, rack density, floor loading, Delta-T, required airflow, cooling tonnage and subnet host capacity.
Offline data center calculator toolkit
LoadSentry: Data Center Tools
Know your load. Protect uptime.
From rack amps to EBITDA per MW, LoadSentry puts 30 purpose-built calculators and 15 live converters in one searchable Android app for data center operators and facility managers.
30 calculators
15 live converters
0 accounts or cloud dependency
Free to start — all 15 converters and 5 core calculators. Unlock the full toolkit with a one-time Lifetime Pro purchase.
Power, cooling, capacity and cost
Fewer spreadsheet lookups. Faster facility decisions.
Lead with the operational number you need now, then move from rack checks to resilience, sustainability and commercial planning without changing tools.
Protect capacity and resilience
See PUE/pPUE, liquid cooling heat removal, UPS runtime, generator runway, power utilization, cooling redundancy, downtime, WUE, ERF, stranded capacity and RTI.
Translate operations into business impact
Model rack TCO, annual energy cost, efficiency payback, downtime exposure, build cost per MW, CUE, carbon cost, revenue per kW and EBITDA per MW.
Replace the conversion scratchpad
Edit any field and see linked units update immediately across electrical, cooling, mechanical, space, weight, pressure, data size and throughput converters.
Facility defaults
Your site assumptions, already filled in.
Save multiple facilities with voltage, electricity rate, PUE, carbon intensity, capacity ceiling and preferred units. Relevant calculators start from the active facility so the next check is consistent with the site you are actually operating.
- Search and favorite frequent tools.
- See the formula behind every calculator.
- Share clean input-and-result summaries for handoffs.
IAD-DC01
Active facility
- Voltage
- 415 V
- Energy rate
- $0.065/kWh
- PUE
- 1.30
- Carbon factor
- 0.4 kg/kWh
- Capacity ceiling
- 8.0 MW
Built for the data hall
Operational math, ready when the next decision lands.
Move from facility setup to rack power, PUE, backup runtime, searchable tools and live converters without leaving the workflow.
The full data center toolkit
Every calculator and converter, in one app.
30 facility-aware calculators across three role-based suites, plus 15 live unit converters. Everything runs offline and on-device — search or favorite what you use most.
30 calculators
Field Operator
Power, thermal & structural checks on the floor
- Three-Phase Rack Power FreeVerify real-time PDU draw so dense racks never trip the breaker.
- Thermal Delta-T FreeCooling efficiency across a server or aisle (exhaust − inlet).
- Structural Floor LoadingConfirm dense GPU racks stay under the raised-floor weight limit.
- Three-Phase ImbalanceFlag uneven L1/L2/L3 loading that overheats the neutral & transformer.
- Breaker Load Headroom FreeStay under the 80% continuous-load limit before adding a circuit.
- Required AirflowAir volume needed to remove a heat load at a target temperature rise.
- Cooling TonnageConvert an IT heat load into tons of refrigeration to size cooling.
- Rack Power DensityHow close a cabinet is to its design power budget before stranding.
- Feeder Voltage DropEstimate copper-conductor voltage drop on a feeder run.
- Subnet Host CapacityUsable IPv4 host addresses available in a subnet prefix.
Operations Manager
Facility efficiency, cooling & backup capacity
- PUE & pPUE Efficiency FreeThe gold-standard facility efficiency ratio (target → 1.0).
- Liquid Cooling Heat DissipationHeat a CDU can reject from secondary-loop flow rate and Delta-T.
- UPS Runtime FreeMinutes of battery left under live load before generators must sync.
- Generator Fuel RunwayBackup runtime left from diesel tank level and current burn rate.
- Power Capacity UtilizationHow much of the facility power envelope is committed.
- Cooling N+1 HeadroomWhether cooling still covers the load with one unit offline.
- Availability & DowntimeAnnual downtime budget implied by an uptime SLA target.
- Water Usage EffectivenessSite water consumed per kWh of IT energy (sustainability metric).
- Energy Reuse FactorShare of facility energy reused elsewhere (e.g. district heat).
- Stranded CapacityGrowth headroom before power, cooling or space caps out.
- Return Temperature IndexAirflow management: 100% is ideal; low is bypass air, high is recirculation.
Executive / Finance
Cost, carbon & revenue per kilowatt
- Fully Burdened TCO / RackTrue monthly cost: amortized CapEx + live power OpEx + maintenance.
- Carbon Usage EffectivenessESG carbon metric: PUE × grid carbon factor.
- Revenue Yield per kWCore colocation profitability: monthly revenue per allocated kW.
- Annual Energy CostTotal yearly electricity spend including cooling and overhead (PUE).
- Efficiency ROI PaybackYears to recover an efficiency investment from annual savings.
- Cost of DowntimeFinancial exposure of an outage at a given hourly impact.
- Build Cost per MWCapEx density of a build versus the $7–12M/MW industry range.
- Carbon CostAnnual carbon tax or offset cost from operational emissions.
- EBITDA per MWOperating profitability normalized to deployed capacity.
15 live converters All free
Power & Electrical
- Amps ↔ KilowattsA, kW — single- or three-phase
- kVA ↔ KilowattsApparent vs. real power at any power factor
- Power & CoolingkW · W · BTU/hr · tons
- EnergykWh · MJ · BTU
Cooling & Mechanical
- Temperature°C ↔ °F
- AirflowCFM · m³/hr · L/s
- Liquid FlowL/min ↔ GPM (US)
- Static PressurePa ↔ inches of water
- Water Pressurebar ↔ PSI
Space & Weight
- Rack UnitsU · mm · in
- Lengthm ↔ ft
- Aream² ↔ ft²
- Weightkg ↔ lb
Data & Network
- Data SizeGB · TB · PB
- ThroughputGbps · GB/s · TB/hr
One-time purchase
One price. The whole toolkit. Forever.
LoadSentry Pro is a one-time purchase — no subscription, no account, no renewal. Buy it once, use it offline on your device.
Free
- All 15 live converters
- 5 core calculators: Three-Phase Rack Power, Breaker Load Headroom, PUE & pPUE, UPS Runtime, and Thermal Delta-T
- Works fully offline
- No account, no ads
LoadSentry Pro
- Everything in Free, plus
- All 30 calculators (floor ops, facility, and commercial/sustainability)
- Save multiple facility profiles with reusable defaults
- Share and export calculation summaries
- Free updates and new calculators
Lifetime Pro
$39.99 USD · one-time
Launch price $29.99 USD — limited time.
One purchase. No subscription, no renewal, no account.
Purchased securely through Google Play. Prices shown in USD and may vary by region.
Private by design
No account. No cloud. No facility data collection.
LoadSentry is designed for connectivity-poor environments and sensitive facility assumptions. The app works offline, stores facility data on the device and keeps every calculation local.
Pro unlocks through Google Play — the only thing that ever leaves your device is the one-time purchase check. Your facilities, inputs, and results stay local. No LoadSentry account, ever.
Product updates
Follow future LoadSentry updates.
Hear about the Google Play launch, new calculators and workflow improvements as they ship.
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Disclaimer
LoadSentry is a professional calculation aid. Results are estimates based on the inputs you provide. Verify inputs, site conditions, equipment specifications, applicable standards and engineering requirements before making operational decisions.
Google Play and the Google Play logo are trademarks of Google LLC.