EnergyVecta is an offline energy calculator that shows its work.

FREE, forever:
- Electricity bill from units and your tariff
- Appliance running cost and standby (vampire) cost
- AC / heater running cost, water-heater cost
- EV charging cost and range per charge
- Generator fuel estimate, UPS / inverter backup time
- LED vs incandescent savings, motor consumption
- Energy unit converters (kWh / MJ / BTU)
- Solar quick-payback teaser

CONSUMER PACKS (one-time, yours forever):
- Solar PV, Ultimate (30 calculators): array & string sizing, inverter ratio, kWh/kWp yield
with performance ratio, tilt & orientation factors, payback & LCOE-lite, solar-plus-storage
sizing, and a guided Solar journey from sizing to payback
- Battery & Storage, Ultimate (25 calculators): bank sizing from your load profile, usable
capacity & depth of discharge, C-rate charge time, runtime under load, degradation estimate,
cost per usable kWh, replacement horizon
- Oil & Gas Field, Ultimate (32 calculators): Vogel IPR well-performance curves, volumetrics
(OOIP/OGIP), pipeline & netback economics, and other field-reference calculators with
textbook provenance
- Home Energy Efficiency (25 calculators): heating-cost and degree-day calculators, insulation
R-value and payback, heat-pump running cost, and other home-efficiency estimators

PROFESSIONAL OIL & GAS PACKS (one-time, yours forever):
- Gas Properties (28 calculators): z-factor by Brill & Beggs or Papay, Sutton/Wichert
pseudo-criticals, density, viscosity, hydrates & inhibition, Wobbe index, ACFM/SCFM/MMSCFD
conversions
- Pipeline Hydraulics (30 calculators): Darcy & explicit friction (Swamee-Jain, Haaland),
Weymouth & Panhandle A/B capacity, erosional velocity, line pack, hoop stress & %SMYS
reference, surge screening by the Joukowsky relation, pig travel
- Gas Compression (30 calculators): staging & ratios, adiabatic/polytropic head, power &
discharge temperature, reciprocating displacement & capacity, surge margin, fan laws, fuel gas
- Flare & Relief, Screening (22 calculators): KO drum settling & sizing, liquid seals,
40 CFR 63.670 NHV screens, API-520-form PSV reference, fire relief loads, blowdown, drum volumes
- Gas Processing (30 calculators): separator sizing by Souders-Brown, binary flash, water content
& TEG dehydration, amine sweetening, NGL content from composition, stabilization

INTERACTIVE, NOT JUST A NUMBER
- Scrub any input and watch every result update live.
- Reverse-solve: pick the result you want and see what input gets you there.
- Open any result to see the math behind it: the formula, the pack version, and
how sensitive it is to each input.
- Follow the Solar journey, size to yield to battery to payback, as one guided
flow, or jump straight to a single calculator.

WHY IT IS DIFFERENT
- Runs entirely on your device. No account, no ads, no tracking, no network.
- Every calculation comes from one of 10 cryptographically signed, verified calculation packs:
276 calculators backed by 1,109 verified test vectors. If a result cannot be computed
honestly, the app refuses and says why. It never guesses.

Preliminary sizing and field reference; screening and reference only for the professional packs.
Verify with a qualified installer, engineer, or energy auditor as applicable. Tariffs, factors
and prices are your inputs; results are not a code-compliance determination, a reserves estimate,
a design determination, or a quote.

Available in 25 languages, including full right-to-left support for Arabic, Urdu,
Farsi, and Hebrew, plus Chinese, Japanese, and Korean.

EnergyVecta is published by CoreVecta LLC.
Privacy policy: https://corevecta.com/privacy/
Support: support@corevecta.com