Calculator Methodology
How our Zakat calculator works
The methodology behind our Zakat calculator — what's included, what's exempt, and how net Zakatable wealth is compared against nisab. A planning tool, not a religious ruling. Consult your scholar for complex cases.
1. Introduction
This calculator provides a structured way for UK donors to estimate their annual Zakat across cash, gold, silver, investments, business assets, property, and liabilities. It is a planning tool — not a fatwa, not a substitute for scholarly advice on complex cases.
Zakat is paid annually on net wealth that has remained above the nisab threshold for one full lunar year (a hawl). This calculator computes net Zakatable wealth at the moment you use it; the question of whether your wealth has been above nisab for a full hawl is a question for you and your scholar.
2. How nisab is calculated
Two nisab thresholds exist in the Sunnah, derived from gold and silver:
- Silver nisab — 612.36g of silver
- Gold nisab — 87.48g of gold
The calculator multiplies these gram thresholds by the current GBP spot price of XAU (gold) or XAG (silver) sourced from a public commodity API, refreshed every six hours. When the API is unreachable, the calculator falls back to recent approximate values and surfaces a “Approximate values” suffix on the price line.
Default: Silver. Most contemporary UK Zakat calculators default to the silver nisab because silver has fallen further in value relative to gold over time, making silver the lower threshold today. Defaulting to silver means more donors qualify to pay Zakat — the cautious position from a fulfilment-of-obligation standpoint. Donors who follow the gold-nisab position can switch using the toggle on the calculator.
3. Asset category rules
The calculator covers seven categories. Each one rolls up a set of related inputs into a per-category subtotal that feeds the overall Zakatable-wealth figure.
Cash and savings
Money held in bank accounts, physical cash, money owed to you that you reasonably expect to be repaid, and foreign currency holdings (entered as GBP equivalent). Cash is the one category where there is no madhab variation — the full amount is Zakatable.
Gold and silver
Coins, bars, and jewelry can be entered either by weight (with the calculator applying the live spot price) or by current market value. The calculator includes all gold and silver as the cautious default.
[Pending scholarly review] Some madhabs exempt regularly- worn jewelry. The current calculator does not apply this exemption automatically — donors who follow Maliki, Shafi'i, or Hanbali positions on jewelry should consult their scholar and adjust their final figure. The v2 calculator will add a per-madhab exemption toggle once a named scholar has reviewed the rule application.
Investments
Stocks and shares are valued at current market value. Pensions are entered at their current value as a cautious default. Cryptocurrency is entered as current GBP value at the time of calculation.
[Pending scholarly review] Pension Zakatability varies by pension type and madhab — SIPPs, employer DC schemes, employer DB schemes, and annuities are treated differently in different scholarly opinions. The current calculator does not break pensions into sub-types; donors with complex pension structures should consult their scholar. The v2 calculator will add a pension-type sub-selector with per-type rules once scholarly review is complete.
[Pending scholarly review] Cryptocurrency Zakat treatment is contested across contemporary scholarship. The calculator includes crypto as a cautious default; some scholars treat crypto differently. Consult your scholar for guidance specific to your situation.
Business assets
Inventory held for sale (stock-in-trade), cash held in business accounts, and money customers owe your business that you reasonably expect to be paid. Inventory is valued at current market value as the cautious default.
[Pending scholarly review] Some scholars value stock-in-trade at original cost rather than current market. The v2 calculator will add a valuation toggle once scholarly review confirms which positions to expose.
Property
Cash held from rental income is Zakatable. The capital value of investment property is not Zakatable. Land held with intent to sell is Zakatable at current market value; land held for personal use is not. Your primary residence is exempt regardless of value.
4. Liabilities
Three liability inputs are deductible against your total Zakatable assets:
- Immediate debts due — debts due now or within the next month (credit cards, bills due, personal debts).
- Long-term debt — next month's payment only — the next single monthly payment on long-term debts like mortgages, car finance, and student loans.
- Tax owed — tax that is due but not yet paid (e.g. self-assessment liability).
Liabilities cannot exceed assets — Zakat is never negative. If your liabilities are greater than your Zakatable assets, the calculator caps the deduction at the asset total and reports £0 net Zakatable wealth.
[Pending scholarly review] The “next month's payment” rule for long-term debts reflects one contemporary position. Other positions allow no deduction for long-term debts, or allow deduction of all instalments due within the Zakat year, or take other approaches. Donors who follow a different position should consult their scholar and adjust their final figure.
5. Disclaimer
This calculator is a guide based on cautious default assumptions. It is not a religious ruling. Deen Relief is a charity, not a religious authority — we provide this tool to help our donors fulfil their Zakat obligation accurately, not to issue fatawa.
For complex cases — particularly involving business structures, multi-currency holdings, unusual asset classes, or pension types we do not currently break out — consult your scholar. If the calculator's cautious default produces a figure higher than your madhab's ruling requires, you may pay the lower figure your scholar identifies as your true obligation.
6. Scholarly attribution
Methodology aligned with established positions from authoritative Islamic finance references.
[Pending scholarly review] Phase-2 work to identify a named UK scholar reviewer and add their attribution and credentials. Until that work is complete, this calculator should be understood as a planning tool whose category structure follows established conventions but whose specific rule applications have not been validated by a named authority on behalf of Deen Relief.
7. Contact
Have a question about your Zakat calculation? Email us at info@deenrelief.org.