Calculator Directory
Search and browse our suite of verified calculators across tax, salary, loans, business, mathematics, health, construction, and conversion.
Mortgage & Loan Amortization Schedule Calculator
Calculate monthly mortgage payments, complete loan amortization schedule, total principal vs interest ratio, and early payoff acceleration.
2D Scientific Graphing Calculator & Function Plotter
Interactive Cartesian coordinate plotter. Graph multiple mathematical curves, inspect roots, intercepts, trigonometric functions, polynomials, and asymptotes.
Fraction Calculator with Step-by-Step Solution
Add, subtract, multiply, and divide fractions and mixed numbers with step-by-step LCD determination, cross-multiplication, and GCD simplification.
Feet and Inches Construction & Carpentry Calculator
Add, subtract, and multiply architectural dimensions in feet, inches, and fractions (down to 1/16th) with instant metric millimeter conversion.
Concrete Calculator (Slabs, Footings & Columns)
Calculate concrete volume in cubic yards, cubic feet, and cubic metres, plus required 60lb, 80lb, and 50kg premix bags with customizable wastage margin.
Pregnancy Due Date & Trimester Milestone Calculator
Calculate your estimated delivery date (EDD), current gestational age in weeks and days, and trimester milestones based on Naegele's rule.
Body Fat Percentage Calculator (US Navy Method)
Measure body fat percentage, lean muscle mass, and fat mass using circumference measurements standardized by the US Navy.
Macronutrient Splitter & TDEE Calculator
Calculate daily calorie targets and exact gram breakdowns for Protein, Carbohydrates, and Fats based on fitness goals (Cutting, Maintenance, Bulking).
Standard Deviation, Variance & Statistics Calculator
Calculate sample and population standard deviation (σ / s), variance, arithmetic mean, sum of squares, and margin of error with full mathematical step table.
Quadratic Equation Solver (ax² + bx + c = 0)
Solve quadratic polynomials with step-by-step discriminant (b² - 4ac) analysis, vertex coordinates, and real or complex imaginary roots.
Flooring & Tile Box Estimator
Calculate square footage/metres, number of tile boxes, grout required, and 10% wastage allowance for hardwood, tile, and laminate projects.
Tip & Bill Splitter Calculator
Calculate restaurant tip percentage, local sales tax, total invoice, and split evenly or rounded per person.
Ohm's Law & Electrical Power Calculator
Calculate Voltage (V), Current (I), Resistance (R), and Power (P) in watts for DC and single-phase AC circuits.
South Africa PAYE Tax Calculator
Estimate South African monthly PAYE for the 2026/27 or 2025/26 tax year, including age-based rebates, retirement contributions, medical scheme fees tax credits and UIF.
Home Loan & Bond Repayment Calculator
Calculate monthly mortgage repayments, total interest paid, and full amortization schedule.
Compound Interest & Investment Calculator
Forecast investment growth with compound frequency, regular monthly deposits, and inflation adjustment.
BMI Calculator (Body Mass Index)
Check your body mass index according to World Health Organization weight classifications.
VAT Calculator (Inclusive & Exclusive)
Instantly add or extract Value Added Tax at standard 15% (South Africa), 20% (UK), or custom rates.
Percentage Calculator (3-in-1)
Calculate what percentage X is of Y, find percentage increases/decreases, and calculate percentage values.
Universal Unit & Measurement Converter
Convert length, mass, and area between metric and imperial systems with certified precision.
Trip Fuel Cost & Consumption Calculator
Calculate total petrol/diesel cost for road trips based on distance, fuel economy, and passenger split.
Weighted GPA Calculator
Calculate your cumulative and semester Grade Point Average on a 4.0 credit-weighted scale.
Simple Interest Calculator
Estimate simple interest, ending balance, and principal growth without compounding.
Personal Loan Payment Calculator
Estimate fixed monthly repayments, total paid, and interest for a fixed-rate installment loan.
Discount and Sale Price Calculator
Calculate the saving and final price after a percentage discount, with optional tax applied after discount.
Percentage Change Calculator
Measure percentage increase or decrease between an original and a new value.
Mean, Median and Mode Calculator
Summarize a list of up to ten numeric observations using common measures of central tendency.
Profit Margin and Markup Calculator
Calculate gross profit, margin, and markup from selling price and cost.
Break-Even Point Calculator
Estimate the sales units and revenue required to cover fixed costs at a given price and variable cost.
Savings Goal Calculator
Estimate monthly savings required to reach a target by a chosen number of months, with optional annual growth.
Inflation and Purchasing Power Calculator
Estimate a future price or the equivalent purchasing power after constant annual inflation.
Sales Tax and VAT Calculator
Add a supplied tax rate to a net price or extract the tax component from a tax-inclusive price.
Sales Commission Calculator
Estimate commission earnings from sales value and a flat commission rate, with optional base pay.
Unit Price Comparison Calculator
Compare the price per unit across two pack sizes to see which offer is better value.
Compound Annual Growth Rate (CAGR) Calculator
Calculate the annualized growth rate between an initial and final value over a period.
Speed, Distance and Time Calculator
Solve for average speed, travel distance, or duration from the other two values.
Density, Mass and Volume Calculator
Calculate density, mass, or volume from the other two quantities.
Force Calculator (Newton's Second Law)
Calculate net force from mass and acceleration or solve for either variable.
Kinetic Energy Calculator
Calculate translational kinetic energy from an object's mass and speed.
Circle Area, Circumference and Diameter Calculator
Calculate circle area, circumference, diameter, and radius relationships.
Triangle Area Calculator (Heron's Formula)
Calculate triangle area from three side lengths and check whether they form a valid triangle.
Rectangle Area and Perimeter Calculator
Calculate area, perimeter, and diagonal length from rectangle dimensions.
Cylinder Volume and Surface Area Calculator
Calculate cylinder volume, curved surface area, and total surface area.
Paint Coverage and Quantity Calculator
Estimate paint volume from wall dimensions, coverage per litre, number of coats, and an allowance for waste.
Gravel, Mulch and Aggregate Volume Calculator
Estimate material volume for a rectangular area at a chosen depth, including optional waste allowance.
Board Foot Lumber Calculator
Estimate board feet for lumber from thickness, width, and length in inches and total piece count.
Time Duration Calculator
Add hours and minutes or estimate total elapsed minutes and decimal hours.
Ratio Simplifier
Reduce a positive integer ratio to its simplest whole-number form and calculate each part's share.
Greatest Common Factor and Least Common Multiple Calculator
Find the greatest common factor and least common multiple of two integers.
Date Difference Calculator
Calculate elapsed days and weeks between two calendar dates entered in ISO format.
Age Calculator
Calculate completed years, months, and days between a date of birth and a chosen date.
Weighted Average Calculator
Calculate a weighted average when each value contributes a different share of the total.
Return on Investment (ROI) Calculator
Estimate net gain or loss and simple ROI from an investment cost and current value.
Investment Payback Period Calculator
Estimate how long a one-time investment takes to recover from a steady annual net cash benefit.
Hourly Wage and Annual Salary Converter
Convert an hourly wage into estimated weekly, monthly, and annual gross earnings from hours and weeks worked.
Acceleration Calculator
Calculate average acceleration from the change in velocity over elapsed time.
Mechanical Work Calculator
Calculate work done by a constant force acting along a displacement.
Power Calculator
Calculate average power from work done over time.
Sphere Volume and Surface Area Calculator
Calculate sphere volume, surface area, and diameter from radius.
Trapezoid Area Calculator
Calculate the area of a trapezoid from its two parallel bases and perpendicular height.
Ideal Gas Law Calculator
Estimate pressure, volume, amount of gas, or absolute temperature using the ideal gas relationship.
Data Transfer Time Calculator
Estimate transfer duration from file size and sustained data-transfer speed.
Tile Quantity and Waste Calculator
Estimate tile count from floor area and tile dimensions, with a configurable waste allowance.
Percentage Points Difference Calculator
Distinguish an absolute percentage-point difference from relative percentage change.
Z-Score Calculator
Calculate how many standard deviations an observation is above or below a distribution mean.
Auto Loan Payment Calculator
Estimate vehicle loan payments after down payment, trade-in credit, sales tax, and fees.
Credit Card Payoff Calculator
Estimate the time and interest needed to repay a card balance with a fixed monthly payment.
Retirement Savings Growth Calculator
Project a savings balance from an initial amount, recurring monthly contributions, and an assumed annual return.
Geometric Mean Calculator
Calculate the geometric mean of positive values for multiplicative growth and ratio analysis.
Harmonic Mean Calculator
Calculate the harmonic mean of positive observations, useful for certain rate and ratio averages.
Proportion Solver
Solve a missing value in a simple proportion a/b = c/x.
Combinations and Permutations Calculator
Calculate ordered permutations or unordered combinations for n items taken r at a time.
Exponent and Power Calculator
Calculate a base raised to an exponent and show a reciprocal interpretation where applicable.
Logarithm Calculator
Calculate the logarithm of a positive value to a valid positive base other than one.
Prime Factorization Calculator
Express a positive integer as a product of prime factors.
Pearson Correlation Coefficient Calculator
Estimate the linear correlation between four paired observations using Pearson's r.
Basal Metabolic Rate (BMR) Estimate
Estimate resting energy needs using the Mifflin-St Jeor equation and user-entered age, height, weight, and sex coefficient.
Body Surface Area Calculator
Estimate body surface area using the Mosteller formula from height and weight.
Running Pace and Speed Calculator
Calculate average pace per kilometre and speed from distance and elapsed time.
Recipe Ingredient Scaler
Scale ingredient quantities proportionally from an original serving count to a target serving count.
Digital Storage Unit Converter
Convert digital storage quantities between decimal units and binary IEC units.
Cone Volume and Surface Area Calculator
Calculate cone volume, slant height, and surface area from radius and perpendicular height.
Percentage Increase
Use the percentage increase to estimate a result from clearly labelled inputs and a stated formula.
Percentage Decrease
Use the percentage decrease to estimate a result from clearly labelled inputs and a stated formula.
Ratio as a Decimal
Use the ratio as a decimal to estimate a result from clearly labelled inputs and a stated formula.
Midpoint
Use the midpoint to estimate a result from clearly labelled inputs and a stated formula.
Distance Between Coordinate Differences
Use the distance between coordinate differences to estimate a result from clearly labelled inputs and a stated formula.
Slope from Rise and Run
Use the slope from rise and run to estimate a result from clearly labelled inputs and a stated formula.
Quadratic Discriminant
Use the quadratic discriminant to estimate a result from clearly labelled inputs and a stated formula.
Circular Sector Area
Use the circular sector area to estimate a result from clearly labelled inputs and a stated formula.
Arc Length
Use the arc length to estimate a result from clearly labelled inputs and a stated formula.
Pyramid Volume
Use the pyramid volume to estimate a result from clearly labelled inputs and a stated formula.
Prism Volume
Use the prism volume to estimate a result from clearly labelled inputs and a stated formula.
Pythagorean Hypotenuse
Use the pythagorean hypotenuse to estimate a result from clearly labelled inputs and a stated formula.
Right Triangle Area
Use the right triangle area to estimate a result from clearly labelled inputs and a stated formula.
Fuel Economy L/100 km to MPG
Use the fuel economy l/100 km to mpg to estimate a result from clearly labelled inputs and a stated formula.
Travel Time
Use the travel time to estimate a result from clearly labelled inputs and a stated formula.
Mass from Density and Volume
Use the mass from density and volume to estimate a result from clearly labelled inputs and a stated formula.
Gravitational Potential Energy
Use the gravitational potential energy to estimate a result from clearly labelled inputs and a stated formula.
Pressure
Use the pressure to estimate a result from clearly labelled inputs and a stated formula.
Ohm's Law Voltage
Use the ohm's law voltage to estimate a result from clearly labelled inputs and a stated formula.
Ohm's Law Current
Use the ohm's law current to estimate a result from clearly labelled inputs and a stated formula.
Ohm's Law Resistance
Use the ohm's law resistance to estimate a result from clearly labelled inputs and a stated formula.
Electrical Power
Use the electrical power to estimate a result from clearly labelled inputs and a stated formula.
Target Weight at BMI
Use the target weight at bmi to estimate a result from clearly labelled inputs and a stated formula.
Calorie Deficit
Use the calorie deficit to estimate a result from clearly labelled inputs and a stated formula.
Protein Intake Estimate
Use the protein intake estimate to estimate a result from clearly labelled inputs and a stated formula.
Markup and Selling Price
Use the markup and selling price to estimate a result from clearly labelled inputs and a stated formula.
Gross Profit Margin
Use the gross profit margin to estimate a result from clearly labelled inputs and a stated formula.
Break-Even Units
Use the break-even units to estimate a result from clearly labelled inputs and a stated formula.
Compound Growth over Three Years
Use the compound growth over three years to estimate a result from clearly labelled inputs and a stated formula.
Regular Savings Growth
Use the regular savings growth to estimate a result from clearly labelled inputs and a stated formula.
Simple Investment Return
Use the simple investment return to estimate a result from clearly labelled inputs and a stated formula.
Inflation Adjustment
Use the inflation adjustment to estimate a result from clearly labelled inputs and a stated formula.
Flooring Area with Waste
Use the flooring area with waste to estimate a result from clearly labelled inputs and a stated formula.
Tile Count Estimate
Use the tile count estimate to estimate a result from clearly labelled inputs and a stated formula.
Concrete Slab Base Area
Use the concrete slab base area to estimate a result from clearly labelled inputs and a stated formula.
Roof Pitch Percentage
Use the roof pitch percentage to estimate a result from clearly labelled inputs and a stated formula.
Rectangular Water Tank Capacity
Use the rectangular water tank capacity to estimate a result from clearly labelled inputs and a stated formula.
Loan-to-Value Ratio
Use the loan-to-value ratio to estimate a result from clearly labelled inputs and a stated formula.