# HI Information — full

> Global Practical Data Intelligence Network. Every number carries a source, a rights status, and a published methodology. This file is the agent-facing index.

## Tools (with canonical answers)
### Compound Interest Calculator
URL: https://hiinformation.com/calculators/finance/compound-interest/
Answer: Compound interest is found with A = P(1 + r/n)^(nt), where interest is added to the balance each period and then earns further interest. Adding regular contributions increases growth because each deposit also compounds over the remaining time.
Formula: A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) − 1) ÷ (r/n)]
Machine: https://hiinformation.com/api/answer/compound-interest.json

### Mortgage Payment Calculator
URL: https://hiinformation.com/calculators/finance/mortgage-payment/
Formula: M = P × [ i(1+i)^n ] ÷ [ (1+i)^n − 1 ]
Machine: https://hiinformation.com/api/answer/mortgage-payment.json

### Loan Payment Calculator
URL: https://hiinformation.com/calculators/finance/loan-payment/
Formula: M = P × [ i(1+i)^n ] ÷ [ (1+i)^n − 1 ]
Machine: https://hiinformation.com/api/answer/loan-payment.json

### APR Calculator
URL: https://hiinformation.com/calculators/finance/apr/
Formula: APR solves: NetProceeds = Σ Payment ÷ (1 + i)^k
Machine: https://hiinformation.com/api/answer/apr.json

### Closing Cost Calculator
URL: https://hiinformation.com/calculators/finance/closing-cost/
Formula: Closing ≈ Home price × closing-rate
Machine: https://hiinformation.com/api/answer/closing-cost.json

### Debt Payoff Calculator
URL: https://hiinformation.com/calculators/finance/debt-payoff/
Formula: n = −ln(1 − iB/PMT) ÷ ln(1 + i)
Machine: https://hiinformation.com/api/answer/debt-payoff.json

### Refinance Calculator
URL: https://hiinformation.com/calculators/finance/refinance/
Formula: Break-even = Closing cost ÷ Monthly savings
Machine: https://hiinformation.com/api/answer/refinance.json

### Salary to Hourly Calculator
URL: https://hiinformation.com/calculators/finance/salary-to-hourly/
Formula: Hourly = Annual salary ÷ (hours/week × weeks/year)
Machine: https://hiinformation.com/api/answer/salary-to-hourly.json

### Percentage Calculator
URL: https://hiinformation.com/calculators/everyday/percentage/
Answer: To find a percent of a number, divide the percent by 100 and multiply by the number — 15% of 200 is 0.15 × 200 = 30. To find what percent one value is of another, divide the part by the whole and multiply by 100.
Formula: P% of N = (P ÷ 100) × N    ·    X/Y × 100 = %    ·    (new − old) ÷ old × 100 = % change
Machine: https://hiinformation.com/api/answer/percentage.json

### Discount Calculator
URL: https://hiinformation.com/calculators/everyday/discount/
Formula: Sale = Price × (1 − discount ÷ 100)
Machine: https://hiinformation.com/api/answer/discount.json

### Age Calculator
URL: https://hiinformation.com/calculators/everyday/age/
Formula: Age = full years, then remaining months and days to the target date
Machine: https://hiinformation.com/api/answer/age.json

### Date Difference Calculator
URL: https://hiinformation.com/calculators/everyday/d-day/
Formula: Days = target date − start date
Machine: https://hiinformation.com/api/answer/d-day.json

### Paint Calculator
URL: https://hiinformation.com/calculators/home/paint/
Answer: Calculate wall area as 2 × (length + width) × height, subtract about 18 ft² per door or window, multiply by the number of coats, then divide by the paint’s coverage (about 350 ft² per gallon). Round up to whole cans.
Formula: Gallons = [ (2(L + W) × H − openings) × coats ] ÷ coverage
Machine: https://hiinformation.com/api/answer/paint.json

### Flooring Calculator
URL: https://hiinformation.com/calculators/home/flooring/
Formula: Boxes = ⌈ (L × W × (1 + waste)) ÷ box coverage ⌉
Machine: https://hiinformation.com/api/answer/flooring.json

### Electricity Bill Calculator
URL: https://hiinformation.com/calculators/home/electricity-bill/
Formula: Cost = (Watts ÷ 1000) × hours × rate
Machine: https://hiinformation.com/api/answer/electricity-bill.json

### Moving Cost Calculator
URL: https://hiinformation.com/calculators/home/moving-cost/
Formula: Estimate ≈ size factor × base + distance × size × rate
Machine: https://hiinformation.com/api/answer/moving-cost.json

### Rent vs Buy Calculator
URL: https://hiinformation.com/calculators/home/rent-vs-buy/
Formula: Own ≈ mortgage P&I + ~1.5%/yr of price (tax, insurance, upkeep) ÷ 12
Machine: https://hiinformation.com/api/answer/rent-vs-buy.json

### Pyeong to Square Meters Calculator
URL: https://hiinformation.com/calculators/units/pyeong-to-sqm/
Answer: One pyeong equals about 3.305785 square meters. To convert, multiply pyeong by 3.305785; to go back, divide square meters by 3.305785. A 25-pyeong home is roughly 82.6 m².
Formula: m² = pyeong × 3.305785
Machine: https://hiinformation.com/api/answer/pyeong-to-sqm.json

### Pyeong to Square Feet Calculator
URL: https://hiinformation.com/calculators/units/pyeong-to-sqft/
Formula: ft² = pyeong × 35.583176
Machine: https://hiinformation.com/api/answer/pyeong-to-sqft.json

### Square Feet to Square Meters Calculator
URL: https://hiinformation.com/calculators/units/sqft-to-sqm/
Formula: m² = ft² × 0.09290304
Machine: https://hiinformation.com/api/answer/sqft-to-sqm.json

### Tsubo to Square Meters Calculator
URL: https://hiinformation.com/calculators/units/tsubo-to-sqm/
Formula: m² = tsubo × 3.305785
Machine: https://hiinformation.com/api/answer/tsubo-to-sqm.json

### Tatami to Square Meters Calculator
URL: https://hiinformation.com/calculators/units/tatami-to-sqm/
Formula: m² = tatami × 1.6562
Machine: https://hiinformation.com/api/answer/tatami-to-sqm.json

### PSI to Bar Calculator
URL: https://hiinformation.com/calculators/units/psi-to-bar/
Formula: bar = psi × 0.0689476
Machine: https://hiinformation.com/api/answer/psi-to-bar.json

### Kilograms to Pounds Calculator
URL: https://hiinformation.com/calculators/units/kg-to-lbs/
Formula: lb = kg × 2.2046226
Machine: https://hiinformation.com/api/answer/kg-to-lbs.json

### Centimeters to Inches Calculator
URL: https://hiinformation.com/calculators/units/cm-to-inches/
Formula: in = cm × 0.3937008
Machine: https://hiinformation.com/api/answer/cm-to-inches.json

### Geun to Grams Calculator
URL: https://hiinformation.com/calculators/units/geun-to-grams/
Formula: g = geun × 600
Machine: https://hiinformation.com/api/answer/geun-to-grams.json

### Cubic Meters to Liters Calculator
URL: https://hiinformation.com/calculators/units/cubic-meter-to-liter/
Formula: L = m³ × 1000
Machine: https://hiinformation.com/api/answer/cubic-meter-to-liter.json

### Cups to Grams Calculator
URL: https://hiinformation.com/calculators/units/cups-to-grams/
Formula: g = cups × 120
Machine: https://hiinformation.com/api/answer/cups-to-grams.json

### Grams to Cups Calculator
URL: https://hiinformation.com/calculators/units/grams-to-cups/
Formula: cups = g × 0.008333333333333333
Machine: https://hiinformation.com/api/answer/grams-to-cups.json

### Currency Converter
URL: https://hiinformation.com/calculators/units/currency/
Answer: Multiply the amount by the exchange rate (target currency per source currency). Reference rates are mid-market and exclude bank fees, so the rate you actually receive when exchanging money will be slightly different.
Formula: Converted = Amount × (rate_to ÷ rate_from), USD-based
Machine: https://hiinformation.com/api/answer/currency.json

## Datasets
### US Moving Cost (v1)
Local and long-distance moving cost ranges by metro and home size.
Coverage: US national + LA/NYC metros (v0 seed) · rights: pending · freshness: quarterly

### US Local Service & Home-Project Cost (v1)
Home-project and local service cost ranges. Blocked on rights clearance for industry references.
Coverage: US (v0, rights-blocked) · rights: pending · freshness: quarterly

### US Electricity Price by State (v1)
US electricity prices (cents/kWh) — residential, commercial, industrial & all-sectors — for all 50 states + DC. Real EIA public-domain data, served via the live Electricity Rates API.
Coverage: US national + 50 states + DC × 4 sectors (real EIA data) · rights: cleared · freshness: monthly

### US Cost of Living Index (v1)
Cost-of-living index by state (BEA Regional Price Parities, US = 100) — public-domain.
Coverage: US (7 states in v0 snapshot; full 50 via `npm run ingest`) · rights: cleared · freshness: annual

## Indexes
### HI Moving Cost Index
A US moving-cost benchmark: national median local-move cost, and each metro's cost relative to the national average (US = 100).
URL: https://hiinformation.com/indexes/hi-moving-cost/ · JSON: https://hiinformation.com/api/index/hi-moving-cost.json

### HI Cost of Living Index
State cost-of-living relative to the US average (= 100), from BEA Regional Price Parities — real public-domain data.
URL: https://hiinformation.com/indexes/hi-cost-of-living/ · JSON: https://hiinformation.com/api/index/hi-cost-of-living.json

## Methodologies
- US moving cost estimation (v1): How HI estimates US moving costs by distance band, home size, and metro. — https://hiinformation.com/methodology/moving-cost-us-v1/
- US electricity price (v1): Average residential electricity price by state, sourced from EIA public-domain data. — https://hiinformation.com/methodology/electricity-cost-us-v1/
- US cost-of-living index (v1): State cost-of-living from BEA Regional Price Parities (all items, US = 100). — https://hiinformation.com/methodology/cost-of-living-us-v1/
- US local service / home-project cost (v1): How HI estimates home-project and local service costs from materials + labor. — https://hiinformation.com/methodology/local-service-cost-us-v1/

## Sources
- U.S. BLS — Consumer Expenditure Surveys (government, authority 95/100) — https://www.bls.gov/cex/
- U.S. BLS — Consumer Price Index (government, authority 96/100) — https://www.bls.gov/cpi/
- U.S. Census Bureau — American Community Survey (government, authority 95/100) — https://www.census.gov/programs-surveys/acs
- U.S. Census Bureau — Geographic Mobility / Migration Flows (government, authority 93/100) — https://www.census.gov/topics/population/migration.html
- FMCSA — Protect Your Move (Interstate Mover Registry) (regulator, authority 90/100) — https://www.protectyourmove.gov/
- U.S. EIA — Electricity Data (Average Retail Price) (government, authority 95/100) — https://www.eia.gov/electricity/
- U.S. HUD — Fair Market Rents (government, authority 90/100) — https://www.huduser.gov/portal/datasets/fmr.html
- U.S. BLS — Occupational Employment & Wage Statistics (government, authority 92/100) — https://www.bls.gov/oes/
- HI Internal Cost Estimation Model (internal_model, authority 60/100)
- Industry Home-Project Pricing References (uncleared) (price_comparison, authority 55/100)
- U.S. BEA — Regional Price Parities (government, authority 94/100) — https://www.bea.gov/data/prices-inflation/regional-price-parities-state-and-metro-area