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Mobile Money Fee Calculator (Côte d'Ivoire & Senegal)

Calculate and compare Wave, Orange Money, MTN and Moov fees across West & Central Africa (Senegal, Côte d'Ivoire, Cameroon, Benin, Togo, Mali, Burkina Faso): withdrawal, transfer and deposit.

FCFA ⇄ Euro Converter

Convert CFA franc (FCFA) to euro and back at the official fixed rate — no live rate needed.

Tontine / ROSCA Calculator

Plan a tontine (rotating savings, ROSCA): pot per round, who gets paid when, and the full cycle schedule.

Zakat Calculator

Zakat is 2.5% of eligible wealth held above the nisab for a lunar year.

BMI Calculator

Calculate your Body Mass Index (BMI) and find out which weight category you fall into.

Standard Deviation Calculator

Sample and population standard deviation, variance and mean from a list of numbers.

Health

BMI, calories, heart rate, body fat and more

BMI Calculator

Calculate your Body Mass Index (BMI) and find out which weight category you fall into.

Calorie Calculator

Find your daily calorie needs based on age, weight, height and activity level.

Running Pace Calculator

Find your running pace per kilometre and your average speed.

Body Fat Calculator

Estimate your body fat percentage with the U.S. Navy method.

Water Intake Calculator

Estimate how much water you should drink per day based on your weight and activity.

Macro Calculator

Split a daily calorie target into protein, carbs and fat for your goal.

Pregnancy Due Date Calculator

Estimate your due date and how far along you are, from your last period.

Ovulation Calculator

Find your most fertile days and ovulation date from your last period and cycle length.

Sleep Calculator

Find the best times to go to bed or wake up, based on 90-minute sleep cycles.

Ideal Weight Calculator

Estimate your ideal body weight from your height and sex, plus your healthy weight range.

Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio (WHR) and see your health-risk level.

Calories Burned Calculator

Estimate calories burned by activity, from your weight and the duration.

Smoking Cost Calculator

How much a smoking habit costs per year and over ten years.

Blood Pressure Category Calculator

Classify a blood-pressure reading (ACC/AHA) and show the pulse pressure. Informational only.

Steps to Distance & Calories

Convert a step count into distance walked and calories burned.

Calorie Deficit Calculator

The daily calorie deficit to reach a target weight within a set number of weeks.

Protein Intake Calculator

Recommended daily protein based on body weight and activity level.

Blood Alcohol Calculator (BAC estimate)

Estimate your blood alcohol level (g/L) using the Widmark formula.

Max Heart Rate & Training Zones

Estimate your maximum heart rate and training zones from your age.

Waist-to-Height Ratio Calculator

Your waist-to-height ratio and health-risk level (keep waist under half your height).

Lean Body Mass Calculator

Estimate your lean body mass and fat mass (Boer formula).

Body Surface Area Calculator (BSA)

Estimate your body surface area (m²) with the Mosteller formula.

One Rep Max Calculator (1RM)

Estimate your one-rep max and training loads from a set you've lifted.

Running Calories Calculator

Estimate the calories you burn running a given distance.

Sports

Pace, VO₂ max, power, heart rate, racing

VO₂ Max Calculator (Cooper Test)

Estimate VO₂ max from the distance run in a 12-minute Cooper test.

Race Time Predictor

Predict a race time at a new distance from a known result (Riegel formula).

Running Speed & Pace Calculator

Your speed (km/h) and pace (min/km) from a distance and a time.

Swimming Pace Calculator

Your pace per 100 m and speed from a swim distance and time.

Power-to-Weight Ratio Calculator

Your cycling power-to-weight ratio in watts per kilogram.

FTP Calculator

Functional threshold power from a 20-minute test (95%), plus W/kg.

Target Heart Rate Calculator (Karvonen)

Your training heart rate using the Karvonen heart-rate-reserve method.

Pace Converter (min/km ⇄ min/mile)

Convert running pace between minutes per kilometre and per mile.

Strength-to-Weight Ratio Calculator

How much you lift relative to your body weight.

Sweat Rate Calculator

Your fluid loss per hour from weight change and fluid drunk during exercise.

Finance

Mortgage, loans, interest, ROI, savings

Compound Interest Calculator

See how your savings or investment grows over time with compound interest.

Loan Calculator

Estimate your monthly loan or mortgage payment, total cost, and total interest.

VAT Calculator

Add or remove VAT (sales tax) from any amount and see the net, tax and gross values.

Salary Calculator

Convert a wage between hourly, weekly, monthly and annual figures.

Profit Margin Calculator

Calculate profit, margin and markup from your cost and selling price.

Simple Interest Calculator

Calculate simple interest and the total amount due over time.

Mortgage Calculator

Estimate your monthly home loan payment, total cost and total interest.

Budget Calculator (50/30/20)

Split your monthly income into needs, wants and savings with the 50/30/20 rule.

Mobile Money Fee Calculator (Côte d'Ivoire & Senegal)

Calculate and compare Wave, Orange Money, MTN and Moov fees across West & Central Africa (Senegal, Côte d'Ivoire, Cameroon, Benin, Togo, Mali, Burkina Faso): withdrawal, transfer and deposit.

FCFA ⇄ Euro Converter

Convert CFA franc (FCFA) to euro and back at the official fixed rate — no live rate needed.

Tontine / ROSCA Calculator

Plan a tontine (rotating savings, ROSCA): pot per round, who gets paid when, and the full cycle schedule.

Savings Goal Calculator

Find out how much to save each month to reach a target amount by a deadline.

Borrowing Capacity Calculator

Find out how much you can borrow based on the monthly payment you can afford.

ROI Calculator (Return on Investment)

Calculate your return on investment: net profit and ROI percentage from what you invested and got back.

Markup & Margin Calculator

From cost and selling price, get the profit, markup % and margin % (the two are often confused).

Reverse VAT Calculator (price excl. tax from incl.)

Find the pre-tax amount and the VAT from a tax-inclusive price.

Break-Even Point Calculator

How many units you must sell to cover your costs — plus the break-even revenue.

Rental Yield Calculator

Gross rental yield of a property from its price and monthly rent.

Notary Fees Calculator

Estimate notary / closing fees on a property purchase and the total cost.

Crypto Profit Calculator

Profit or loss and ROI on a crypto trade from buy price, sell price and quantity.

Car Depreciation Calculator

Estimate a car's value after several years at an annual depreciation rate.

Price per Square Meter Calculator

Property price divided by area — to compare listings fairly.

CAGR Calculator

Compound annual growth rate between a start and end value over several years.

Debt-to-Income Ratio Calculator

Your monthly debt payments as a percentage of your gross monthly income.

Down Payment Calculator

The deposit and the loan amount from a price and a down-payment percentage.

Inflation Calculator

How prices rise and purchasing power falls over time at a given inflation rate.

Net Worth Calculator

Your net worth: everything you own minus everything you owe.

Monthly Savings (SIP) Calculator

The future value of a regular monthly investment with compound growth.

Zakat Calculator

Zakat is 2.5% of eligible wealth held above the nisab for a lunar year.

Rule of 72 Calculator

How many years it takes to double (and triple) money at a given return.

Sales Commission Calculator

The commission earned on a sale and the amount left over.

APY Calculator (Effective Rate)

Turn a nominal rate and compounding frequency into the real annual yield.

FIRE Number Calculator

The portfolio you need to live off withdrawals, using the 4% rule.

Emergency Fund Calculator

How much to set aside to cover several months of expenses.

Cap Rate Calculator

The capitalization rate of a property: net operating income ÷ price.

Debt Payoff Calculator

How many months to clear a debt and the total interest you will pay.

Math

Percentage, fractions, equations, statistics

Percentage Calculator

Work out a percentage of any amount, plus the value increased or decreased by that percentage.

Rule of Three Calculator

Solve a proportion instantly: if A corresponds to B, find what C corresponds to.

Percentage Change Calculator

Calculate the percentage increase or decrease between two values.

Ratio Calculator

Simplify a ratio and get its decimal and percentage form.

Weighted Average Calculator

Calculate a weighted average (grades with coefficients, scores with weights) — add as many rows as you need.

GCD & LCM Calculator

Find the greatest common divisor (GCD) and least common multiple (LCM) of two whole numbers.

Power / Exponent Calculator

Raise a base to an exponent (bᵉ) — instantly.

Nth Root Calculator (square, cube…)

Find the square root, cube root or any nth root of a number.

Factorial Calculator (n!)

Compute the factorial of a whole number (n!), up to 170.

Modulo Calculator (remainder)

Find the remainder and quotient of a division (a mod b).

Percent Error Calculator

The percentage difference between a measured value and the true value.

Z-Score Calculator

How many standard deviations a value is from the mean.

Combinations & Permutations Calculator

Count the ways to choose or arrange r items from a set of n (nCr and nPr).

Slope Calculator

The slope, percent grade and angle of a line through two points.

Quadratic Equation Solver

Solve ax² + bx + c = 0 and get the discriminant and roots.

Distance Between Two Points

The straight-line distance between two points on a plane.

Logarithm Calculator

The logarithm of a number in any base, plus the natural log.

Arithmetic Sequence Calculator

The nth term and the sum of an arithmetic sequence.

Geometric Sequence Calculator

The nth term and the sum of a geometric sequence.

Roman Numeral Converter

Convert a number (1–3999) into Roman numerals.

Scientific Notation Converter

Express a number as a coefficient × 10 to a power.

Prime Number Checker

Check whether a number is prime and find its smallest divisor.

Fraction to Decimal Calculator

Convert a fraction into a decimal and a percentage.

Average Calculator (Mean)

Find the mean, median, sum, min and max of a list of numbers.

Statistics

Standard deviation, probability, confidence intervals

Standard Deviation Calculator

Sample and population standard deviation, variance and mean from a list of numbers.

Probability Calculator

The probability of an event as favourable outcomes ÷ total outcomes.

Odds to Probability Calculator

Convert odds (for : against) into a probability percentage.

Confidence Interval Calculator

The confidence interval for a mean: mean ± z·(SD/√n).

Sample Size Calculator

The sample size needed for a survey at a given confidence and margin of error.

Coefficient of Variation Calculator

The relative variability of data: standard deviation ÷ mean × 100.

Standard Error Calculator

The standard error of the mean: standard deviation ÷ √n.

Binomial Probability Calculator

The probability of exactly k successes in n independent trials.

Z-Score to Percentile Calculator

The percentile of a z-score on the standard normal distribution.

Margin of Error Calculator

The margin of error for a mean at a chosen confidence level.

Geometry

Area, perimeter, volume, Pythagoras

Circle Calculator (area, circumference)

From the radius, get a circle's diameter, circumference and area.

Rectangle Calculator (area, perimeter)

From length and width, get a rectangle's area, perimeter and diagonal.

Triangle Area Calculator

Find a triangle's area from its base and height.

Pythagorean Theorem Calculator (hypotenuse)

Find the hypotenuse of a right triangle from its two legs.

Cylinder Volume Calculator

Find the volume and surface area of a cylinder from its radius and height.

Sphere Volume Calculator

Find the volume and surface area of a sphere from its radius.

Cone Volume Calculator

The volume of a cone from its base radius and height.

Trapezoid Area Calculator

The area of a trapezoid from its two parallel sides and height.

Cube Volume Calculator

The volume and surface area of a cube from the length of one side.

Ellipse Area Calculator

The area and approximate perimeter of an ellipse from its two semi-axes.

Heron's Formula Calculator

The area of a triangle from the lengths of its three sides.

Pyramid Volume Calculator

The volume of a square pyramid from its base side and height.

Hexagon Area Calculator

The area and perimeter of a regular hexagon from its side length.

Rhombus Area Calculator

The area and side length of a rhombus from its two diagonals.

Circular Sector Calculator

The area and arc length of a circular sector from radius and angle.

Parallelogram Area Calculator

The area of a parallelogram from its base and height.

Regular Polygon Area Calculator

The area and perimeter of a regular polygon from sides and side length.

Physics

Ohm's law, force, energy, acceleration

Momentum Calculator

Linear momentum from mass and velocity (p = m·v).

Coulomb's Law Calculator

The electrostatic force between two point charges. Charges are in microcoulombs (µC).

Electrical Power Calculator

Power and resistance from voltage and current (P = V × I).

Wavelength Calculator

The wavelength of a wave from its frequency, using the speed of light.

Work Calculator (Physics)

Mechanical work done by a force over a distance (W = F × d).

Mechanical Power Calculator

Power as work done divided by the time taken (P = W ÷ t).

Pressure Calculator (P = F/A)

Pressure as force divided by area, in pascals and kilopascals.

Gravitational Force Calculator

Newton's gravitational force between two masses (F = G·m₁·m₂/r²).

Ohm's Law Calculator (V = R·I)

Find voltage and power from current and resistance.

Force Calculator (F = m·a)

Find force from mass and acceleration (Newton's second law).

Kinetic Energy Calculator

Find kinetic energy from mass and velocity.

Potential Energy Calculator

Find gravitational potential energy from mass and height.

Acceleration Calculator

Find acceleration from the change in velocity over time.

Chemistry

Molar mass, molarity, dilution, pH, gas laws

Moles to Grams Calculator

Convert moles of a substance to its mass using the molar mass.

Molarity Calculator

The molar concentration of a solution: moles of solute per litre.

Dilution Calculator (C₁V₁ = C₂V₂)

How much stock solution to take to reach a target concentration and volume.

Ideal Gas Law Calculator (PV = nRT)

The number of moles of a gas from its pressure, volume and temperature.

pH Calculator

The pH and pOH from the hydrogen ion concentration.

Percent Yield Calculator

The percent yield of a reaction: actual ÷ theoretical × 100.

Mass Percent Calculator

The mass percent concentration: mass of solute ÷ mass of solution × 100.

Half-Life Calculator

How much of a substance remains after a given time of decay.

Moles to Particles Calculator

The number of particles in a given amount of substance (Avogadro number).

Molality Calculator

The molal concentration: moles of solute per kilogram of solvent.

Ecology

Carbon footprint, water, energy and waste calculators to measure and reduce your environmental impact.

Car Carbon Footprint Calculator

Estimate the CO₂ your car emits per year from distance, fuel consumption and fuel type.

Flight Carbon Footprint Calculator

Estimate the CO₂e of a flight per passenger, by distance and haul type, with a car-distance equivalent.

Electricity Carbon Footprint Calculator

Convert your electricity use into CO₂ using your grid’s carbon intensity.

Tree Carbon Offset Calculator

How many trees does it take to absorb your CO₂ emissions? Based on ≈22 kg per mature tree per year.

Shower Water Usage Calculator

How much water do your showers use per week and per year? Duration × flow rate, with yearly total in m³.

Plastic Bottle Waste Calculator

Turn your weekly bottled-water habit into kilograms of plastic and CO₂ per year.

LED Savings Calculator

How much energy and money do you save by switching your bulbs to LED?

Solar Panel Savings Calculator

Estimate the yearly production and value of a solar installation from its size and your climate.

Meat Carbon Footprint Calculator

Estimate the yearly CO₂e of your meat consumption by type, servings and portion size.

Paper Usage Calculator

Convert your daily printing into sheets, kilograms of paper and trees per year.

Conversion

Units, currencies, time zones, dates

Currency Converter

Convert between 160+ world currencies with live exchange rates, including the West & Central African CFA franc.

Temperature Converter

Convert between Celsius, Fahrenheit and Kelvin instantly.

Length Converter

Convert between meters, kilometers, miles, feet, inches and more — instantly.

Weight Converter

Convert between kilograms, grams, pounds, ounces, tonnes and more — instantly.

Area Converter

Convert between square meters, hectares, acres, square feet and more — instantly.

Volume Converter

Convert between liters, milliliters, gallons, cups, cubic meters and more — instantly.

Data Storage Converter

Convert between bits, bytes, KB, MB, GB, TB and binary units (KiB, MiB, GiB) — instantly.

Pressure Converter

Convert between bar, psi, pascal, atm, mmHg and more — instantly.

Energy Converter

Convert between joules, calories, kWh, kcal, BTU and more — instantly.

Power Converter

Convert between watts, kilowatts, horsepower (hp & metric ch), MW and BTU/h — instantly.

Data Rate Converter

Convert between Mbps, MB/s, Gbps and more — and settle the bit vs byte confusion.

Time Converter

Convert between seconds, minutes, hours, days, weeks, months and years — instantly.

Fuel Economy Converter

Convert fuel consumption between L/100 km, km/L and mpg (US & UK) — instantly.

Angle Converter

Convert between degrees, radians, gradians and turns — instantly.

Frequency Converter

Convert between Hz, kHz, MHz, GHz and rpm — instantly.

Torque Converter

Convert torque between N·m, kgf·m, lb·ft and lb·in — instantly.

Oven Temperature Converter

Convert oven temperature between °C, °F and the French thermostat mark.

Shoe Size Converter

Convert shoe sizes between EU, US and UK (men's, approximate).

Number Base Converter

Convert a decimal number to binary, octal and hexadecimal.

PX to REM Converter

Convert CSS pixels to rem and em based on a root font size.

Aspect Ratio Calculator

Simplify a width and height into a clean aspect ratio like 16:9.

RGB to HEX Converter

Convert an RGB color (0–255 each) to its #RRGGBB hex code.

Speed Converter

Convert speeds between km/h, mph, m/s and knots.

Home & DIY

Paint, tiles, concrete, wallpaper, lawn

BTU Calculator (Air Conditioning)

Estimate the cooling power (BTU/h) needed for a room from its floor area.

Stair Calculator

The number of steps and the real step height from a total rise.

Mulch & Topsoil Calculator

The volume of mulch or topsoil needed to cover an area to a depth.

Fence Calculator

The number of panels and posts needed for a fence of a given length.

Brick Calculator

How many bricks a wall needs, per m² and in total (with 10% waste).

Paint Calculator (litres needed)

How many litres of paint you need for a wall area and number of coats.

Tile Calculator (how many tiles)

Number of tiles to cover an area, including wastage.

Concrete Calculator (volume)

Volume of concrete for a slab from its length, width and thickness.

Wallpaper Calculator (rolls needed)

Number of wallpaper rolls for a wall area, including wastage.

Grass Seed Calculator

Kilograms of grass seed for a lawn area at a given sowing rate.

Everyday life

Tips, fuel, cooking, time, age