Every calculator on Skrtiri is built on an official regulation or authority, not guesswork. This page lists the official sources behind each calculator, and is updated with any new official change.
Salary & Employment
End-of-Service Gratuity: Saudi Labor Law, Royal Decree No. M/51 and its amendments, Articles 80, 84, and 85.
Net Salary: Officially published regulations of the General Organization for Social Insurance (GOSI).
Next Payday: Royal order unifying government employee payday to the 27th of the Gregorian month (2018).
GOSI Pension: General Organization for Social Insurance (GOSI) — replacement rates for both the old and new contribution systems.
Taxes & Government Fees
VAT Calculator: Zakat, Tax and Customs Authority (ZATCA) — Royal Order No. 41 of 1441H.
Customs Duty: ZATCA — published calculation formula and exemption thresholds.
Dependent & Expat Levy: official government decisions published via Absher, Qiwa, and Muqeem platforms.
Social & Living Support
Citizen's Account: the actual code published on the official Citizen's Account program website (portal.ca.gov.sa).
Enhanced Social Security: Ministry of Human Resources and Social Development — increase values announced November 2023.
Housing Support: Ministry of Municipal, Rural Affairs and Housing — the "Sakani" housing support program.
Electricity Cost: Saudi Electricity Company (SEC) — tiered residential tariff.
Fuel Cost: government fuel price cap policy for gasoline, and Aramco's annual diesel review; emission factors from the US EPA.
Finance & Investment
Loan Calculator: APR calculation guidance and mortgage LTV caps — Saudi Central Bank (SAMA).
Zakat on Stocks: contemporary fiqh opinion from the International Islamic Fiqh Academy and major fatwa bodies.
Calculators with no required official source
The remaining calculators (date conversion, date difference, percentages, GPA, gold and bullion, currency conversion, budgeting, bill splitting, and others) rely on general mathematical formulas or figures the user enters themselves (like an exchange rate or gold price), and are not tied to a single regulatory body.
These calculators are general guidance tools and do not replace checking directly with the official authority or consulting a specialist. Read the full Disclaimer.