Start with one question
Pick the calculator that matches the bill row or equipment choice you are trying to understand.
Free tools
Calculators that run on your numbers.
Screening calculators for the decisions Indian businesses actually face. Everything runs in your browser: nothing you type is uploaded, stored or sent anywhere.
Each result is an estimate built from what you enter. The exact figures are on your bill, and a free BillTrends preview prices them precisely, source line included.
Use them to screen a question before you call a vendor, ask an auditor, or open a tariff order. They are useful for first-pass checks on PF correction, contract demand, ToD shift value, rooftop solar payback, diesel backup, connected load, compressed air, VFD savings, outage cost, UPS sizing, and cooling cost.
The calculators do not read your bill and do not know your final tariff treatment. Use the bill as the authority, then use BillTrends when you need the exact charge line, month, and source PDF behind the number.
Power factor correction (kVAr)
Size the capacitor fix and price what poor PF costs on kVAh billing.
Factories, auditorsOpen
Contract demand headroom
See what the billing floor makes you pay for demand you never draw.
FactoriesOpen
Time-of-day shift value
What moving shiftable load out of peak windows is worth, from your own rates.
FactoriesOpen
Solar payback from your bill
Simple payback from your units, rate and a vendor quotation.
Owners, solar consultantsOpen
DG vs grid cost
Per-unit diesel cost against your grid rate, and the monthly premium.
FactoriesOpen
Connected load estimator
Add up equipment, apply a diversity factor, sanity-check sanctioned load.
Owners, contractorsOpen
Compressed air leak cost
Convert leak or unload share into wasted units and rupees.
Auditors, factoriesOpen
Pump and fan VFD savings
Affinity-law screening of what a drive could save on throttled flow.
Auditors, factoriesOpen
Power cut production loss
Put a rupee figure on outages: contribution, restarts, idle labour.
FactoriesOpen
UPS and battery sizing
kVA and battery Ah for the runtime your critical load actually needs.
Offices, clinics, ITOpen
AC and HVAC running cost
Monthly cost of cooling from tonnage, efficiency, hours and your rate.
Commercial buildingsOpen
How to use them
Screen first, then verify from the bill.
Enter only what you know
Use values from the bill, nameplate, quotation, or site note. Avoid filling a blank with a confident guess.
Treat the result as a shortlist
A calculator can point to a saving. The bill audit confirms the exact rupees, source line, and month.
Common questions
Free tools, private inputs.
Are these calculators free?
Yes. The BillTrends calculators are free to use.
Is my data stored?
No. Everything runs in your browser. Nothing you type into these calculators is uploaded or stored.
Do they replace a bill audit?
No. The calculators are screening tools. BillTrends prices the exact figures from your bills, with each number traced to its source line.