Clear, practical guides on Zakat, Hajj, and halal personal finance — paired with our free calculators.
How to value Bitcoin, Ethereum, and other digital assets for zakat, including staking rewards and active trading vs. long-term holding.
Is zakat due the moment you're paid, or only on what you save? A clear breakdown for salaried employees.
Do you owe zakat on a 401k, EPF, or pension you can't access yet? How locked vs. accessible retirement savings are treated.
How to calculate zakat on checking accounts, savings, foreign currency, and money owed to you, with a worked example.
The 8 categories of zakat recipients (asnaf) named in the Quran, who is excluded, and giving to relatives or abroad.
How to find your zakat due date (hawl), what to record each year, and how to handle a missed payment.
Active trading, long-term holdings, and the 30% estimate method, explained.
Which Miqat applies to your route, and the correct order of rituals from Ihram to Tahallul.
Why the reward equals a full year, the rules for timing, and how to track your days.
Inventory valuation, deductions, and the 2.5% rate for traders and shop owners.
Why the property is exempt, and how to calculate Zakat on the income it produces.
Why the time shifts daily, and how it's calculated from Maghrib and Fajr.
The distance, timing, and combination rules that let travelers keep up with prayer on the road.
Why three days a month, every month, can carry the reward of fasting an entire year.
When each window opens and closes, what's typically included, and how to actually build the habit.
How Ramadan dates are set each year, and how to build a daily schedule for suhoor, prayer, work, and Taraweeh.
Why your Hijri age differs from your Gregorian age, and how to calculate it step by step.
How many circuits are required, why pilgrims lose count, and what to do if you're unsure.
How many times to repeat SubhanAllah, Alhamdulillah, and Astaghfirullah, and the best times of day to build a lasting dhikr habit.
30-day, 60-day, and year-round Quran reading plans based on Juz, pages, and daily time.
How Eid dates are set, why they shift each year, and what to prepare before each one arrives.
Broken oaths, deliberately broken fasts, and zihar — what each kaffarah costs and how to work it out.
How fidyah differs from qada and kaffarah, who owes it, and how the daily amount is worked out.
Why Islamic dates shift every year, how the lunar calendar works, and how to convert dates accurately.
Who owes it, how much per person in food or cash, and the deadline before the Eid prayer.
Valid reasons to miss a fast, whether make-up days must be consecutive, and the deadline to finish them.
Why livestock Zakat isn't a flat percentage, the Sa'imah condition, and the classical Nisab tables for each animal type.
A practical walkthrough of nisab, the hawl year, and the 2.5% rate — with a free calculator to get your exact number.
When farm produce becomes zakatable, how irrigation changes the rate, and how to work out what you owe.
A step-by-step overview of the Hajj journey, and what to do if you're unable to complete a required rite.
Everything you need to calculate zakat on cash, savings, and total wealth — step by step.
Fixed heirs, residuary heirs, and how each family member's share is calculated.
The astronomy and geometry behind the five daily prayers and the direction to Makkah.
The exact GPA formula, the standard 4.0 grade-point scale, and a full worked example across several courses.
GPA measures one term, CGPA measures your whole academic record — the formulas for both and a worked multi-semester example.
The exact math behind the two most common grading curves, with worked examples for a whole class.
The exact formula for working out what score you need on a final exam to hit a target overall grade.
The exact formula for combining homework, quizzes, midterms, and finals into one overall course grade.
The exact formula to convert any test or exam score into a percentage, with a letter-grade conversion table.
A complete walkthrough of every scientific calculator function — trig, logs, powers, roots, memory keys, fractions, and scientific notation — with an example for each.
What degrees and radians actually measure, the exact conversion formulas both ways, a quick-reference table of common angles, and when to use each unit.
Every significant figures rule explained — counting rules, rounding, and how sig figs carry through addition, subtraction, multiplication, and division.
Work backward from a percentage increase or decrease to find the original number, with the exact formula and worked examples.
The two numbers use the same profit figure but different formulas — the exact math, a conversion table, and why mixing them up leads to underpricing.
The exact tip formula, mental-math shortcuts, common tipping percentages, and how to split a bill fairly among a group.
The exact formula for turning any percent-off deal into a real dollar amount and a final sale price, with worked examples for single discounts, stacked discounts, and tax.
The exact formula for comparing a measured or estimated value against a true value, worked examples from the lab and the real world, and how percentage error differs from percentage change.
The exact rule for solving multi-step expressions, worked examples, and the 6÷2(1+2) debate explained.
Step-by-step conversion in both directions, multiplying and dividing in scientific notation, with worked examples.
Every core exponent and logarithm rule explained with worked examples and how the two operations relate.
The three core percentage formulas explained simply, with worked examples and common mistakes to avoid.
The single formula behind every percentage change, with worked examples for raises, discounts, and growth.
Step-by-step methods for moving between fractions, decimals, and percentages, with a full reference table.
The exact formulas for BMR and TDEE, activity multipliers explained, and worked examples so you know your real number.
The math behind fat loss, how to size your deficit correctly, and the mistakes that stall progress.
How to size your surplus correctly, lean bulk vs dirty bulk, and the realistic pace of real muscle growth.
The exact BMI formula in metric and imperial units, worked examples, and the full category chart.
Why pregnancy and menopause change how the BMI number should be read, and what to track alongside it.
Why BMI can misclassify athletes, older adults, and different ethnic groups — and what to check instead.
Why an IVF pregnancy is dated from the embryo's age, not your last period — with the exact formulas for day 3 and day 5 transfers.
The due date formula for twins is the same as any pregnancy — but the realistic delivery window is not. Here's why.
Irregular cycles, recent birth control, or just not remembering the date — how a due date still gets calculated.
The exact formula behind a pregnancy due date, why it's 280 days from your last period, and which dating method doctors trust most.
How to calculate your due date from a known conception date, why the count is 266 days not 280, and how to pin down your conception window.
The real statistics behind due date accuracy, the "due window," and what actually affects how close your estimate will be.
What sets a currency's price, why it moves every day, and how to read and convert rates correctly.
The hidden markup behind almost every currency exchange, and how to calculate exactly what it's costing you.
Comparing every option — banks, airports, ATMs, and cards — so your travel budget goes to your trip, not to fees.
The manual method for exact age in years, months, and days, common mistakes, and where the precise number actually matters.
Why subtracting birth years gets it wrong, and how to calculate the real gap between two people.
What a biological age estimate is based on, what it can't tell you, and how it differs from your actual age.
The exact formulas for converting between metric and imperial length units, quick-reference tables, and worked examples.
The exact conversion factors for kilograms, pounds, grams, ounces, and stone, with worked examples for body weight, cooking, and shipping.
The exact formulas for converting between the three major temperature scales, with a mental math shortcut and worked examples.