The MEPF & solar numbers architects ask us for
56 calculators for the space, load and budget questions that come before an engineering quote. Each one says what it estimates and what it cannot decide, keeps your inputs in your browser, and shows its method.
★ Architect Essentials
The space-planning & feasibility numbers you reach for first.
MEPF Budget Calculator
Put a defensible services budget in your feasibility pitch.
Low, base and high MEPF budgets from your area, discipline rates, fixed items and contingency — tax shown separately.
Concept stageOpen → ★ EssentialAC Cooling-Load Screening
Size the AHU / plant room, ODU deck and the load it adds.
Cooling load in kW and TR from your own W/m² basis plus separately assessed latent and process loads.
Concept stageOpen → ★ EssentialWater Demand & Storage
Operational tank volumes — and the terrace load they add.
Daily domestic and process demand and operational storage from your own per-person basis — fire storage kept separate.
Concept stageOpen → ★ EssentialFire Water Storage Checker
Test the fire-water volume your design basis gives.
Checks the arithmetic of a fire tank against engineer-approved flow, duration and minimum volume.
Concept stageOpen → ★ EssentialDG Preliminary Load
Drives the DG room and electrical-room footprint.
Steady-state planning kVA from essential load, PF and a stated allowance — transients flagged for OEM review.
Schematic stageOpen → ★ EssentialSTP Hydraulic Load
Carve out the correct STP footprint early — not later.
Mean and future sewage flow in KLD from measured sewage or water demand and a stated return fraction.
Concept stageOpen →Every input term is defined in the engineering glossary. The buying questions behind the numbers are in the buyer's guides and the FAQ; capability documents are on resources.
All calculators by discipline
Budget & planning
Project Phase & Timeline Estimator
Critical path and total working days from your own tasks, durations and dependencies.
Open calculator → Budget & planningMEP Renovation Budget
Line-item renovation budget: replacements, demolition, temporary services and access, phased or full.
Open calculator → Budget & planningMEP Quotation Comparison
Put bids on one scope: common quantities, missing-scope allowances and tax kept apart.
Open calculator → Budget & planningFactory Downtime Cost
Lost contribution from a planned shutdown or outage, plus restart and extra labour costs.
Open calculator → Budget & planningProject Delay Carrying Cost
Overhead, financing and lost contribution of a delay, each shown as its own line.
Open calculator →HVAC
Ventilation & Air Changes
Airflow in CMH and CFM from room volume and an air-change rate you can source.
Open calculator → HVACDuct Cross-Section
Duct area, round diameter and rectangular sides from airflow and a chosen velocity.
Open calculator → HVACChiller & Cooling Tower
Chiller TR, cooling tower, water flows and power from the cooling load.
Open calculator → HVACChiller Retrofit Savings
kWh and rupee savings from a plant kW/TR improvement, by operating bin, with payback only if net savings are positive.
Open calculator → HVACVRF vs Chiller Lifecycle Cost
Present cost of two HVAC options on the same scope: capex, energy, O&M, replacements, residual.
Open calculator → HVACVFD Pump & Fan Savings
Screening energy savings from variable speed, with the cube-law limits shown.
Open calculator →Electrical
Transformer Sizing
Planning kVA from coincident demand, power factor and a chosen utilisation, rounded to a rating you confirm.
Open calculator → ElectricalFactory Spare Electrical Capacity
Headroom on an existing transformer for an expansion — negative headroom shown as it is.
Open calculator → ElectricalCable Size
Copper/aluminium cable size by voltage drop + current capacity.
Open calculator → ElectricalLighting Fixtures & Load
Fitting count and installed kW for an average-lux target, from lumens, utilisation and maintenance factors.
Open calculator → ElectricalLED Retrofit Savings
Energy and rupee savings from replacing fittings — negative savings shown, payback only if positive.
Open calculator → ElectricalPower Factor Correction (kVAr)
Capacitor kVAr to move a measured load from one PF to another; savings only from your own tariff formula.
Open calculator → ElectricalEV Charging Expansion Load
Coincident kW and kVA from charger input ratings, quantities and an enforced simultaneity.
Open calculator → ElectricalUPS Energy & Runtime
Energy-balance runtime from battery voltage, Ah, strings, efficiency and ageing — not a discharge-curve guarantee.
Open calculator → ElectricalDG Running Cost per Unit
₹/kWh and annual running cost from measured fuel use, fuel price, maintenance and delivered kW.
Open calculator → ElectricalCEIG Readiness Checker
Whether your HT/substation/DG installation needs Electrical Inspector approval, and how ready your file is.
Open calculator →Plumbing
Treated-Water Reuse Savings
Annual saving from reusing compliant treated water against matching demand, net of treatment costs.
Open calculator → PlumbingRainwater Yield & Storage
Monthly capture, use, overflow and carry-forward for your catchment, rainfall, demand and tank.
Open calculator → PlumbingPump Head & Input Power
Total head and electrical input kW from flow, lifts, losses and efficiencies.
Open calculator → PlumbingWater Pipe Velocity Sizing
Internal diameter for a flow and velocity, and the velocity in real pipe sizes you enter.
Open calculator →Fire
Fire NOC Document Readiness
Which documents you have and which are missing for a fire NOC file — applicability is not assessed without verified local rules.
Open calculator → FireSprinkler Quantity Estimator
Area-only lower-bound head count from a designer's coverage, beside your layout count.
Open calculator → FireFire Pump Room
Pump-room floor area, dimensions and the pump set you need.
Open calculator → FireFire Extinguisher Qty
How many extinguishers and which types, by area and hazard (IS 2190).
Open calculator → FireRefuge Area
High-rise floor refuge area under NBC 2016 Part 4, from occupant load and height.
Open calculator →Solar
Commercial & Industrial Solar EPC
Feasibility, approvals, financing and every solar calculator in one place.
Open → SolarSolar for Home
Price by system size, PM Surya Ghar subsidy, roof needed and payback.
Open → SolarSolar Plant Cost & Financial Model
Self-use, export and value reconciled to generation; payback, NPV and IRR — or why IRR has no unique answer.
Open calculator → SolarSolar CAPEX vs OPEX (PPA)
Ownership against a PPA on the same kWh and boundaries, discounted, with obligations listed.
Open calculator → SolarBattery Energy & Backup Duration
Nominal battery kWh for a critical load and hours, from usable depth, discharge efficiency and end-of-life capacity.
Open calculator → SolarSolar Panel & Inverter
Panel count, inverter rating, area and yield for a given kW.
Open calculator → SolarSolar Plant Area
Land (acres) or roof area needed for a kW/MW solar plant.
Open calculator → SolarSolar vs Sanctioned Load
Whether your rooftop solar fits your DISCOM sanctioned-load / net-metering cap.
Open calculator → SolarShadow-Free Area Solar
Rooftop solar capacity (kWp), generation and module count from your shadow-free area.
Open calculator → SolarSolar EMI & Cash Flow
Whether the monthly saving covers the EMI — the number that decides financed projects.
Open calculator → SolarDG vs Solar
Diesel against solar on cost per unit — usually the strongest solar case a factory has.
Open calculator → SolarSolar Payback Period
Payback years, ROI and 25-year savings from your bill, tariff and plant cost.
Open calculator → SolarSolar Subsidy (PM Surya Ghar)
Central subsidy for a home rooftop system — slabs, the ₹78,000 cap and how it is paid. Homes only.
Open calculator → SolarNet Metering Savings
Split savings into self-consumed vs exported units — and what net billing changes.
Open calculator → SolarSolar Generation (kWh)
Annual, monthly and daily units for any plant size, with seasonal highs and lows.
Open calculator → SolarSolar AMC Cost
Annual maintenance cost by plant size and coverage — and the generation it protects.
Open calculator → SolarSolar Roof Load
Dead load (kg/m² and tonnes) a rooftop array adds, by mounting type — not a structural check.
Open calculator → SolarSolar Water Pump
Pump HP to solar array (kWp), panel count and controller — borewell, agri, industrial.
Open calculator → SolarOpen Access Savings
Landed grid tariff vs landed open-access rate — the saving on your consumption.
Open calculator → SolarSolar Carbon Offset
Tonnes of CO₂ avoided per year and over 25 years — ESG-ready, CEA grid factor.
Open calculator →ELV & operations
CCTV Storage & Network
Recording TB and aggregate Mbps from your camera groups' recorded bitrates, hours and retention.
Open calculator → ELV & operationsMEP Maintenance Budget
Annual preventive-maintenance budget from your asset counts, visits, hours and rates — scope and exclusions listed.
Open calculator →All tools give indicative estimates only — not binding designs or quotations. Final figures follow a site survey and the relevant Indian codes (NBC 2016, IS standards, DISCOM policy).
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