Calculators
Finance, health, school and everyday-life calculators that answer a specific question fast — a loan payment, a BMI, a GPA, a Zakat amount — without the SEO-stuffed ad walls most calculator sites bury the actual tool under.
124 tools in this category.
Age Calculator
Exact age in years, months and days.
Percentage Calculator
X% of Y, X as % of Y, and % change.
BMI Calculator
Body-mass index with WHO ranges.
Loan / EMI Calculator
Monthly payment, total interest, total cost.
Currency Converter
Convert between 160+ currencies at daily rates.
Date Calculator
Days between dates, or add days to a date.
Unit Converter
Length, weight and temperature units.
Compound Interest Calculator
See your savings grow with monthly deposits.
GPA Calculator
Grades + credits → your GPA.
Mortgage Calculator
Monthly home-loan payment & total interest.
Discount Calculator
What you pay and what you save.
VAT / GST Calculator
Add VAT to net, or extract it from gross.
Tip Calculator
Tip, total, and per-person split.
Calorie / BMR Calculator
Daily calories with the Mifflin-St Jeor formula.
Pregnancy Due Date Calculator
Estimate your due date from your last period.
Ovulation Calculator
Estimate your fertile window.
Salary Converter
Hourly ↔ daily ↔ monthly ↔ yearly pay.
Retirement Calculator
Project your retirement pot.
Inflation Calculator
What your money will be worth later.
Fraction Calculator
Add, subtract, multiply, divide fractions.
Mean, Median & Mode
Instant stats from any list of numbers.
Standard Deviation Calculator
Sample & population σ with variance.
Scientific Calculator
sqrt, sin, log, powers…
Temperature Converter
°C ↔ °F ↔ K.
Aspect Ratio Calculator
Get a ratio, or scale dimensions without distortion.
Zakat Calculator
2.5% of zakatable wealth above nisab.
Marks Percentage Calculator
Marks → percentage + SSC/HSC grade band.
Final Grade Calculator
What you need on the final to hit your goal.
Body Fat Calculator
US Navy tape-measure method.
Ideal Weight Calculator
Devine & Robinson reference formulas.
Macro Calculator
Protein, carbs and fat grams for your goal.
Water Intake Calculator
How much water should you drink daily?
Sleep Cycle Calculator
The best time to sleep or wake up.
Heart Rate Zone Calculator
Training zones from your age & resting HR.
One-Rep Max Calculator
Estimate your 1RM from any set.
Running Pace Calculator
Pace per km/mile, speed and splits.
Car Loan Calculator
Finance a vehicle: payment & total cost.
Amortization Schedule
Full month-by-month payment breakdown.
ROI Calculator
Return on investment + annualized rate.
CAGR Calculator
Compound annual growth rate.
Fuel Cost Calculator
Trip cost from distance, mileage and price.
Electricity Cost Calculator
What an appliance costs to run.
Savings Goal Calculator
How much to save each month to hit a goal.
Paint Calculator
How much paint for a room.
Tile Calculator
Tiles needed + waste allowance.
Concrete Calculator
Volume + cement bags for a slab.
Wallpaper Calculator
Rolls needed for a room.
Cooking Measurement Converter
Cups ↔ tbsp ↔ ml ↔ oz.
Recipe Scaler
Scale ingredients up or down.
Area Calculator
Rectangle, circle, triangle…
Speed Converter
km/h ↔ mph ↔ m/s ↔ knots.
Fuel Economy Converter
km/L ↔ L/100km ↔ MPG.
Shoe Size Converter
US ↔ UK ↔ EU ↔ cm.
Tax-Inclusive Calculator
Add or extract GST/VAT.
Hourly to Salary
Hourly rate → yearly income.
Add/Subtract Days
Date maths, business-days aware.
Typing Speed (WPM)
Words per minute from a sample.
Crop Size Calculator
Largest crop at a target ratio.
Screen PPI Calculator
Pixel density of any screen.
Energy Converter
Joule, calorie, kWh, BTU…
Power Converter
Watt, horsepower, BTU/h…
Pressure Converter
Bar, PSI, atm, Pascal…
Data Storage Converter
Bytes, KB, MB, GB, GiB…
Angle Converter
Degrees, radians, gradians.
Force Converter
Newton, kgf, lbf, dyne.
Frequency ↔ Wavelength
Radio/light frequency to wavelength.
Ohm's Law Calculator
V, I, R and power.
Torque Converter
Nm, lb-ft, lb-in, kgf·m.
Density Converter
kg/m³, g/cm³, lb/ft³.
Volume Converter
Litres, gallons, cups, m³.
Percentage Change Series
% change across a list.
Proportion Solver
Solve A/B = C/X.
Wind Chill Calculator
How cold it really feels.
Heat Index Calculator
How hot it really feels.
Dew Point Calculator
Comfort from temp & humidity.
Race Time Predictor
Predict 5K→marathon times.
Body Surface Area
BSA for medicine.
Clothing Size Converter
US ↔ UK ↔ EU sizes.
Words Per Page
Word count → page estimate.
Simple Interest Calculator
Interest without compounding.
Discount Calculator
Stack multiple discounts.
Sales Tax Calculator
Add sales tax to a price.
Freelance Rate Calculator
What to charge per hour.
ROAS Calculator
Return on ad spend.
CPM / CPC Calculator
Ad cost metrics.
Customer LTV Calculator
Lifetime value of a customer.
Loan Affordability
How much can you borrow?
Down Payment Calculator
Deposit and loan amount.
Rule of 72 Calculator
When does money double?
Annuity Calculator
Future & present value.
NPV Calculator
Discounted cash-flow value.
Gross to Net Salary
Take-home after deductions.
Commission Calculator
Sales commission + base.
Percent of Total
Each item as a % of the sum.
Savings Rate Calculator
What % of income you save.
Compounding Frequency
Annually vs daily vs continuous.
Length Converter
mm, cm, m, km, in, ft, mi…
Weight Converter
mg, g, kg, oz, lb, stone.
Time Unit Converter
ms, s, min, hours, days, years.
Oven Temperature Converter
°C ↔ °F ↔ Gas Mark.
Decimal to Fraction
0.375 → 3/8, simplified.
Quadratic Equation Solver
Roots of ax² + bx + c = 0, real or complex.
GCD & LCM Calculator
Greatest common divisor & least multiple.
Prime Checker & Factorizer
Is it prime? If not, see its factors.
Combinations & Permutations
nCr and nPr, exact — even huge numbers.
Triangle Calculator
Area, angles & type from three sides.
Pythagorean Theorem Calculator
Find the missing side of a right triangle.
Circle Calculator
Radius, diameter, circumference, area.
Logarithm Calculator
log₁₀, ln, log₂ or any base.
Ratio Calculator
Solve A:B = C:X proportions.
Slope Calculator
Slope, line equation, distance, midpoint.
Weighted Average Calculator
Averages where some values count more.
Rounding Calculator
Decimals, significant figures, or nearest N.
Scientific Notation Converter
0.00034 ↔ 3.4 × 10⁻⁴.
Sequence Calculator
Arithmetic & geometric: nth term + sum.
Waist-to-Hip Ratio Calculator
A quick health-risk screening number.
Smoking Cost Calculator
See what smoking really costs you.
Child Height Predictor
Mid-parental height estimate.
Calories Burned Calculator
Estimate burn from any activity.
Margin & Markup Calculator
Profit margin vs markup, per unit.
Break-Even Calculator
Units to sell before you profit.
Number Format Converter
Western ↔ South-Asian ↔ European grouping.
Reading Time Calculator
How long will your article take to read?
Week Number Finder
ISO week and day-of-year for any date.