Free online calculators
Answers for loans, Pakistan salary tax, Zakat, dates, conversions and math. Every tool shows its formula, a worked example and the limits of its result.
All tools
Age Calculator
Find completed years, months and days on any selected date.
Date & TimeDate Difference Calculator
Count elapsed days or days until a selected future date.
Date & TimeBond Yield Calculator
Compare a bond's current yield with a calculated nominal yield to maturity.
FinancePregnancy Due Date Calculator
Estimate a due date and count weeks since the last menstrual period.
HealthVolume Converter
Convert common metric, US liquid and Imperial volume units.
ConvertersPercentage Calculator
Find a percentage of any positive or negative number.
MathCompound Interest Calculator
Estimate growth when interest is added to the balance repeatedly.
FinanceSimple Interest Calculator
Calculate fixed-principal interest and a final amount over a chosen term.
FinanceAdult BMI Calculator
Calculate adult body mass index from weight and height.
HealthLoan Payment Calculator
Estimate a fixed monthly payment and total interest on a loan.
FinanceBrowse by topic
Start with a familiar question. Each shortcut opens the right calculator with the relevant options selected.
Currency Converters
Convert a foreign currency to Pakistani rupees with the rate from your bank or exchange company. Each pair opens the same converter with both currencies selected.
Unit Converters
Common length, weight and temperature pairs, opened in the converter that holds the exact unit definitions.
Islamic Calculators
Arithmetic for zakat and related obligations. The ruling, threshold and rate for your case stay with the scholar you follow.
Salary & Pension Calculators
Pakistan salary tax, pay conversions, service length and retirement benefits, each tied to the rule it applies.
Business Calculators
Shortcuts to the pricing, profit and tax questions sellers ask most often.
Articles with worked examples
- Salary & Pension articleFBR Salary Tax Slabs for Tax Year 2027, With Five Worked SalariesFor tax year 2027, the first Rs 600,000 of annual taxable salary is untaxed and each later slice is taxed at 1% to 35%. A taxable salary of Rs 150,000 a month pays Rs 72,000 a year, an effective rate of 4%.6 min readRead article
- Finance articleHow to Read an Amortization Schedule, Row by RowEach row charges one month's interest on the balance you still owe and uses the rest of the fixed payment to cut that balance. Because the balance is largest at the start, early payments are mostly interest, and the split only tips toward principal late in a long loan.6 min readRead article
- Islamic articleZakat on Gold and Silver: Nisab in Grams and Tola ExplainedThe nisab is 87.48 grams of gold or 612.36 grams of silver, which is 7.5 tola and 52.5 tola. Whether your jewellery passes the gold test can depend on one detail: whether you weigh the piece or only the pure gold in it.6 min readRead article
- Business articleProfit Margin vs Markup: Why a 25% Markup Is Only a 20% MarginA 25% markup on cost gives a 20% margin on the selling price, because the same profit is divided by a larger number. Convert with margin = markup ÷ (1 + markup) and markup = margin ÷ (1 − margin).5 min readRead article
- Finance articleCompound vs Simple Interest: Worked Examples Over 30 YearsSimple interest pays the same amount every year on the original principal; compound interest pays on a growing balance. At 8%, the two match in year one, differ by 3,589.25 after 10 years and by 66,626.57 after 30 years on a 10,000 deposit.5 min readRead article
- Converters articleMarla to Square Feet: 225 or 272.25, and Why It MattersA revenue marla is 272.25 sq ft and a Lahore, Faisalabad or DHA marla is 225 sq ft, so the same "5 marla" can be 1,361.25 or 1,125 sq ft. The larger marla is exactly 21% bigger, and every price per marla comparison needs that checked first.5 min readRead article
Explore by category
Start with the topic, then choose the calculation that fits your question.
Date & Time
Plan dates and understand elapsed time with calendar-aware calculations.
6 calculatorsFinance
Explore payments, yields and growth with explicit financial assumptions.
14 calculatorsBusiness
Price, margin, break-even, commission and tax arithmetic for sellers and freelancers.
5 calculatorsSalary & Pension
Pay, tax-slab, service-length and retirement-benefit arithmetic with the governing rule named.
7 calculatorsIslamic
Zakat, Fitrana and Ushr arithmetic that keeps the religious ruling with your chosen scholar.
3 calculatorsHealth
Use clear screening and estimation tools with practical limits explained.
7 calculatorsConverters
Move between defined units with transparent conversion factors.
11 calculatorsMath
Solve everyday number questions and see the calculation method.
9 calculatorsWriting & Creator
Inspect drafts and use transparent creator utilities with clear limits.
6 calculatorsEducation
Work through course averages with your institution's grading rules in view.
4 calculatorsEveryday Costs
Estimate entered travel, energy and shared-bill costs with assumptions visible.
4 calculators