Methodology
How UtilityPilot calculators are built, the formulas and assumptions used, and the responsible-use guidance that applies to all tools on this platform.
How calculators are structured
Every UtilityPilot calculator is built around a specific, named business calculation. Each page includes:
- →A clear description of what the calculator does and what inputs it requires
- →The formula or method used, stated explicitly on the page
- →A worked example showing real inputs and the expected output
- →Guidance on interpreting the result in a business context
- →A limitations and responsible-use note
- →Links to related calculators in the same workflow
Formulas and calculation methods
Calculations use standard industry formulas. Key examples:
Gross Margin
(Revenue − Cost of Goods Sold) ÷ Revenue × 100
Expressed as a percentage. This is gross margin, not net margin — it does not account for operating expenses, taxes or overheads.
VAT (Add)
Net amount × (1 + VAT rate ÷ 100)
Standard ad valorem application. Rates are user-entered; this calculator does not look up live rates. Always confirm the applicable rate with HMRC or your local tax authority.
CBM (Cubic Metres)
Length (m) × Width (m) × Height (m) × Quantity
Measures outer carton dimensions. Volumetric weight for sea freight = CBM × 1,000 kg. Air freight dimensional weight = CBM × 167 kg (IATA standard, 6,000 cm³/kg).
Chargeable Weight (Air Freight)
max(Actual weight, L × W × H cm³ ÷ 6,000)
Carriers charge the greater of actual gross weight and dimensional weight. IATA standard uses divisor 6,000; courier services (DHL, FedEx, UPS) typically use 5,000.
Import Duty
Customs value × Ad valorem duty rate ÷ 100
Customs value is typically CIF (goods + international freight + insurance) in most countries, and FOB in the United States. Actual duty is determined by the importing country's customs authority based on the HS code, country of origin, and applicable trade agreements.
Business Days Between Dates
Count of calendar days excluding Saturdays, Sundays, and public holidays
Public holidays are defined per country. The working day engine covers 40+ countries using official holiday definitions. Always confirm with the relevant country's official calendar for legal deadlines.
Net Present Value (NPV)
Σ [Cash flow t ÷ (1 + discount rate)^t] − Initial investment
Assumes cash flows occur at end of period. The discount rate is user-entered — this is typically the cost of capital or a required rate of return.
Break-Even Units
Fixed costs ÷ (Selling price per unit − Variable cost per unit)
Contribution margin approach. Does not account for stepped fixed costs at volume thresholds.
Assumptions and limitations
Each calculator makes assumptions to keep calculations simple and usable. These are documented on each page. General assumptions include:
- →Tax rates are user-entered. This platform does not maintain a live tax rate database. Users are responsible for using the correct rate for their jurisdiction and transaction.
- →Freight calculations assume perfect rectangular cartons, single-orientation packing, and no overhang. Actual loading is subject to stacking strength, carrier restrictions and packing method.
- →Import duty estimates are planning guides only. Official duty is determined by the importing country's customs authority. Free trade agreement rates require certificates of origin and eligibility review.
- →Financial calculations (ROI, NPV, IRR, break-even) use simplified inputs. They do not account for tax effects, inflation beyond the discount rate, or stepped costs unless explicitly stated.
- →Working day calculations use published holiday schedules. Regional or state-level holidays may not be included. Always confirm with the official calendar for legal or contractual deadlines.
- →Cargo insurance premium estimates are indicative only. Actual premiums depend on the insurer, cargo type, route, insured value and policy conditions.
Browser-based computation
All calculations run entirely in the user's browser using JavaScript. No values are sent to a server, stored in a database, or logged. Closing the browser tab clears all entered values. Users can verify this by inspecting network requests — no data leaves the browser when a calculation is performed.
This means entered values (loan amounts, invoice totals, carton dimensions, etc.) are never collected or stored by UtilityPilot. The only exceptions are standard analytics events (page views, calculator starts) collected via Google Analytics 4, which do not include entered values.
Responsible use
UtilityPilot calculators are planning and estimation tools. They are not substitutes for professional advice. The following uses require verification by a qualified professional:
Tax
VAT returns, GST filings, duty declarations — verify with HMRC, ATO, IRAS or your local tax authority.
Customs and import duty
Tariff classification, duty rates, FTA eligibility — use a licensed customs broker.
Financial projections
Investment decisions, loan covenants, board presentations — verify with a qualified financial adviser or accountant.
Legal deadlines
Contract terms, SLA commitments, statutory deadlines — verify with legal counsel.
Freight and logistics
Container load plans, carrier booking, pallet specifications — confirm with your freight forwarder or 3PL.
Insurance
Cargo insurance coverage, premium calculations — obtain a formal quote from a licensed insurer or broker.