Everyday tools & health calculators
Date and time, health and fitness, unit conversion, everyday maths, and business tools — all free, all offline-capable, none of it sent anywhere. This hub is separate from the tax/financial calculators; nothing here assumes or requires any tax context.
Date & Time
Age Calculator
Exact age in years, months, and days, plus Hijri age and next birthday
Date Difference Calculator
Days, weeks, months, and years between two dates
Date Add/Subtract Calculator
Add or subtract days, weeks, months, or years from a date
Working Days Calculator
Business days excluding weekends and Pakistan's public holidays
CNIC Info & Renewal Reminder
Decode the gender digit, and a renewal reminder from your issuance date
Time Calculator
Add or subtract hours, minutes, and seconds
Time Duration Calculator
Elapsed hours and minutes between two clock times
Time Card Calculator
Weekly work hours from clock-in/out times, with break deductions
Timezone Calculator
Convert a time between cities — for calls with overseas clients
Day of the Week Calculator
Find what day of the week any date falls on
Health & Fitness
BMI Calculator
WHO standard plus South Asian-specific classification
Ideal Weight Calculator
Devine, Robinson, and Hamwi formulas, plus a South Asian range
Calorie / TDEE Calculator
BMR (Mifflin-St Jeor) and daily calorie needs by activity level
Body Fat Calculator
US Navy circumference method — no scale needed
Water Intake Calculator
Daily water needs adjusted for activity and Pakistan's heat
Pregnancy Due Date Calculator
Estimated due date, current week, trimester, and Hijri date
BMR Calculator
Basal Metabolic Rate — calories burned at complete rest (Mifflin-St Jeor)
Macro Calculator
Protein, carb, and fat grams from your daily calorie target
Protein Calculator
Daily protein target range in grams, by body weight and activity level
Carbohydrate Calculator
Daily carbohydrate target range in grams, from your calorie intake
Fat Intake Calculator
Daily dietary fat target range in grams, from your calorie intake
Calories Burned Calculator
Estimate calories burned by activity, weight, and duration (MET method)
Target Heart Rate Calculator
Training heart rate zones from age and resting heart rate (Karvonen method)
One Rep Max Calculator
Estimated 1RM from a lifted weight and rep count (Epley & Brzycki)
Lean Body Mass Calculator
Estimated lean body mass and fat mass (Boer formula)
Pace Calculator
Running/cycling pace (min/km) and speed (km/h) from distance and time
Ovulation Calculator
Estimated ovulation date and fertile window from your last period
Period Calculator
Predicted next 6 period start dates from your last period
Pregnancy Weight Gain Calculator
Recommended total pregnancy weight gain range by pre-pregnancy BMI
Conception Date Calculator
Estimated conception date worked backward from a due date
Body Surface Area Calculator
Body surface area in m² (Mosteller and DuBois formulas) — reference only
GFR Calculator
Estimated kidney function (eGFR) — 2021 CKD-EPI creatinine equation
Body Frame Size Calculator
Small, medium, or large body frame from height and wrist circumference
Unit Conversion
Everyday Maths
Percentage Calculator
X% of Y, percentage increase/decrease, and more
Discount Calculator
Final price and savings, including stacked discounts
Average Calculator
Mean, median, mode, min, max, and sum
Ratio Calculator
Simplify a ratio or divide a total by ratio parts
Fraction Calculator
Add, subtract, multiply, or divide fractions exactly
Bill Split Calculator
Split a bill evenly or unevenly, with tip
Number to Words (Pakistani Rupees)
Lakh/Crore style, for cheques and invoices
Roman Numeral Converter
Convert between numbers and Roman numerals
Business & Freelance
Freelancer Rate Calculator
The hourly rate you need to hit your target income
Invoice Generator
Printable itemized invoice — nothing uploaded or stored
Profit Margin Calculator
Margin, markup, and target selling price
Break-Even Calculator
Units and revenue needed to cover fixed costs
Typing Speed Test
WPM and accuracy — English and Urdu modes
Math & Algebra
Percent Error Calculator
How far a measured value is from the theoretical value
Exponent Calculator
Raise any number to any power
Root Calculator
Square root, cube root, or any nth root
Log Calculator
Logarithm to any base, including natural log
Quadratic Formula Calculator
Solve ax² + bx + c = 0 — real or complex roots
Number Base Converter
Binary, Octal, Decimal, and Hexadecimal, all at once
LCM & GCF Calculator
Least Common Multiple and Greatest Common Factor together
Factor Calculator
Every factor of a number, plus prime factorization
Rounding Calculator
Round to decimal places or significant figures
Scientific Notation Calculator
Standard ↔ scientific notation, both directions
Big Number Calculator
Arithmetic on numbers of any size, no precision loss
Matrix Calculator
Add, subtract, multiply, transpose, determinant — up to 4×4
Half-Life Calculator
Radioactive/exponential decay — solve for any variable
Random Number Generator
Random integers in any range, with or without repeats
Statistics & Probability
Standard Deviation Calculator
Population and sample variance/std. deviation
Number Sequence Calculator
Arithmetic and geometric sequences — nth term and sum
Sample Size Calculator
Survey sample size from confidence level and margin of error
Probability Calculator
Single and combined-event probability
Permutation & Combination Calculator
nPr and nCr for any n and r
Z-Score Calculator
Standard deviations from the mean, plus percentile
Confidence Interval Calculator
CI for a sample mean at any confidence level
Geometry
Circle Calculator
Radius, diameter, circumference, and area
Triangle Calculator
Solve any triangle from its three sides
Right Triangle Calculator
Pythagorean theorem — find the missing side or angles
Area Calculator
Square, rectangle, triangle, circle, trapezoid, parallelogram
Volume Calculator
Cube, box, cylinder, sphere, cone, pyramid
Surface Area Calculator
Cube, box, cylinder, sphere, cone
Slope Calculator
Slope and line equation from two points
Distance Between Two Points
Straight-line distance in 2D or 3D
Construction & Home
Science
Height Calculator
Predict a child's adult height from both parents' heights
Density Calculator
Solve for density, mass, or volume
Speed Calculator
Solve for speed, distance, or time
Molarity Calculator
Solve for molarity, moles, or volume
Molecular Weight Calculator
Molar mass of any chemical compound from its formula
Electronics
Internet & Dev Tools
IP Subnet Calculator
Network, broadcast address, host range from IPv4 + CIDR
Password Generator
Strong, random password — generated entirely in your browser
Bandwidth Calculator
File transfer/download time from size and connection speed
Base64 Encoder / Decoder
Encode/decode text to and from Base64, fully offline
URL Encoder / Decoder
Percent-encode or decode text/URLs