08 Tech Group — All-in-One Calculator Hub

Mortgage Calculator

Estimate monthly mortgage payments, total interest, and loan payoff timelines.

Loan Calculator

Calculate monthly payments for personal, auto, and business loans.

Compound Interest Calculator

Project investment growth with compound interest and regular contributions.

Auto Loan Calculator

Estimate car loan payments, total interest, and trade-in impact.

Salary Calculator

Convert annual salary to hourly, weekly, and monthly pay estimates.

Investment Calculator

Project portfolio growth with starting capital and recurring deposits.

Inflation Calculator

See how inflation changes purchasing power over time.

Sales Tax / VAT Calculator

Add or remove sales tax / VAT from a price instantly.

Retirement Calculator

Project nest-egg growth from savings, returns, and retirement age.

Amortization Calculator

Build a full loan amortization schedule with principal and interest splits.

Currency Converter Calculator

Convert amounts between currencies using a custom exchange rate.

Income Tax Calculator

Estimate progressive income tax from brackets, income, and deductions.

401(k) Calculator

Project 401(k) growth with employee deferrals and employer match.

House Affordability Calculator

Estimate how much home you can afford from income and debt ratios.

Rent Calculator

Check rent affordability and split roommate shares fairly.

Credit Card Payoff Calculator

Estimate months and interest to pay off a credit card balance.

Debt Payoff Calculator

Plan payoff for a consolidated debt with fixed payments and APR.

Refinance Calculator

Compare current loan vs refinance payment, interest, and break-even.

Payment Calculator

Compute fixed loan or installment payments from principal, rate, and term.

Mortgage Payoff Calculator

See how extra payments shorten your mortgage and reduce total interest.

Interest Rate Calculator

Solve for APR or effective rate from payment, principal, and term.

Savings Calculator

Project savings growth with deposits, interest rate, and time horizon.

Marriage Tax Calculator

Compare combined tax liability for married filing jointly versus separately.

Estate Tax Calculator

Estimate estate tax on net assets above exemption thresholds.

Pension Calculator

Estimate monthly pension benefit from salary, years of service, and multiplier.

Social Security Calculator

Estimate retirement benefits from earnings history and claiming age.

Annuity Calculator

Project annuity accumulation from premiums, rate, and deferral period.

Annuity Payout Calculator

Convert annuity balance into estimated monthly income for life or fixed period.

Credit Card Calculator

Estimate monthly interest accrual and payoff timing from a credit card balance, APR, and fixed payment.

Debt Consolidation Calculator

Estimate payoff time and interest savings when consolidating multiple debts into one new loan.

Repayment Calculator

Estimate monthly repayment amount, number of payments, and total interest for a fixed-rate loan.

Student Loan Calculator

Estimate your student loan monthly payment and total interest using principal, APR, and repayment term.

College Cost Calculator

Project total college cost over multiple years using annual expenses and optional tuition inflation.

Simple Interest Calculator

Compute simple interest and maturity amount from principal, rate, and time.

CD Calculator

Estimate certificate of deposit (CD) maturity value from principal, rate, and term with compounding.

Bond Calculator

Estimate bond price from coupon rate, yield, face value, and maturity.

Mutual Fund Calculator

Project mutual fund growth from an initial investment, optional periodic contributions, and expected return.

Roth IRA Calculator

Project Roth IRA account growth from contributions and assumed return over time.

IRA Calculator

Project traditional IRA growth and future value using contributions, time, and an assumed return.

ROI Calculator

Calculate return on investment from gain and cost for projects or purchases.

APR Calculator

Estimate an annual percentage rate (APR) from interest amount, principal, and time.

Margin Calculator

Compute gross profit margin percentage from revenue and costs for products or services.

Business Loan Calculator

Estimate business loan monthly payment and total interest using principal, APR, and term.

Real Estate Calculator

Estimate property investment value changes using home price, rental income, and growth assumptions.

Present Value Calculator

Calculate present value from future cash flow and a discount rate.

Future Value Calculator

Compute future value from present amount, rate, and time using compounding.

Payback Period Calculator

Estimate how quickly an investment recovers its cost using annual cash flows.

Take-Home Paycheck Calculator

Estimate take-home pay from gross income using simplified deductions and tax assumptions.

Down Payment Calculator

Compute down payment amount from purchase price and down payment percentage.

Rent vs Buy Calculator

Compare the financial impact of renting versus buying using simplified monthly and cash-flow assumptions.

Fitness & Health Calculators

BMI, calories, body metrics, and wellness math.

27 tools

BMI Calculator

Calculate Body Mass Index and see standard weight category ranges.

Calorie / TDEE Calculator

Estimate daily calorie needs (BMR & TDEE) for maintain, cut, or bulk goals.

Body Fat Calculator

Estimate body fat percentage using the US Navy method.

Calories Burned Calculator

Estimate calories burned from activity type, weight, and duration.

Ideal Weight Calculator

Estimate ideal body weight ranges using common formulas.

Pregnancy Due Date Calculator

Estimate due date from last menstrual period (Naegele’s rule).

BMR Calculator

Estimate basal metabolic rate with Mifflin–St Jeor equations.

Macro Calculator

Split daily calories into protein, carbs, and fat grams.

Pregnancy Weight Gain Calculator

See IOM-style recommended pregnancy weight gain ranges by BMI.

Target Heart Rate Calculator

Find training heart-rate zones from age using % of max HR.

Protein Intake Calculator

Estimate daily protein needs from body weight and goal.

Ovulation Calculator

Estimate ovulation and fertile window from cycle length and LMP.

Conception Calculator

Estimate conception date from due date or gestational age.

Period Calculator

Predict next periods from last period date and cycle length.

Lean Body Mass Calculator

Estimate lean body mass and fat mass from weight and body fat %.

Carbohydrate Intake Calculator

Estimate daily carb grams from calories or activity needs.

Height Percentile Calculator

Estimate child height percentile from age, sex, and stature.

One Rep Max Calculator

Estimate your 1RM from submaximal weight and reps using proven formulas.

Fat Intake Calculator

Calculate daily fat grams from calories and target fat percentage.

GFR Calculator

Estimate glomerular filtration rate for kidney function screening.

Body Type Calculator

Classify somatotype tendencies from frame, shoulders, and waist ratios.

Body Surface Area Calculator

Compute BSA from height and weight using Du Bois and Mosteller formulas.

BAC Calculator

Estimate blood alcohol concentration from drinks, weight, and time.

Pace Calculator

Convert running pace, speed, distance, and time for race planning.

Army Body Fat Calculator

Estimate body fat percentage using U.S. Army circumference method.

Healthy Weight Calculator

Find healthy weight range from height using BMI and frame adjustments.

Overweight Calculator

Assess overweight and obesity class from BMI with category labels.

Math Calculators

Percentages, scientific ops, and core math helpers.

42 tools

Percentage Calculator

Solve percent of, percent change, and reverse percentage problems instantly.

Scientific Calculator

Browser scientific calculator with trig, logs, powers, and constants.

Fraction Calculator

Add, subtract, multiply, and divide fractions with simplified results.

Triangle Calculator

Find area, perimeter, and missing side with common triangle formulas.

Standard Deviation Calculator

Compute mean, variance, and sample/population standard deviation.

Volume Calculator

Compute volume for cube, box, sphere, cylinder, and cone shapes.

Area Calculator

Calculate area for rectangle, triangle, circle, trapezoid, and ellipse.

Random Number Generator

Generate random integers or decimals within a custom range.

Probability Calculator

Compute basic event probabilities, complements, and combined odds.

Z-Score Calculator

Convert a value to a z-score given mean and standard deviation.

Ratio Calculator

Simplify ratios and scale part-to-part amounts proportionally.

Number Sequence Calculator

Generate arithmetic and geometric sequences from first term and ratio.

Percent Error Calculator

Compute percent error between experimental and theoretical values.

Exponent Calculator

Raise numbers to powers including fractional and negative exponents.

Binary Calculator

Convert and perform arithmetic in base-2 binary notation.

Hex Calculator

Convert hexadecimal to decimal and perform hex arithmetic.

Half-Life Calculator

Model exponential decay from half-life, initial amount, and elapsed time.

Quadratic Formula Calculator

Solve ax² + bx + c = 0 with real and complex roots.

Slope Calculator

Find line slope from two points or from slope-intercept form.

Log Calculator

Evaluate logarithms with any base including natural log and log10.

Sample Size Calculator

Estimate survey sample size from margin of error and confidence level.

Confidence Interval Calculator

Calculate a confidence interval for a population mean using sample statistics and a confidence level.

Distance Calculator

Compute the distance between two points using the coordinate distance formula.

Circle Calculator

Calculate circle area and circumference from radius.

Surface Area Calculator

Estimate total surface area for common 3D shapes using their dimensions.

Pythagorean Theorem Calculator

Solve for the hypotenuse or a missing leg in a right triangle using the Pythagorean theorem.

Right Triangle Calculator

Find missing side lengths and angles in a right triangle using trigonometry and the Pythagorean theorem.

Root Calculator

Compute square roots, cube roots, and n-th roots as both roots and exponent powers.

Least Common Multiple Calculator

Compute the least common multiple (LCM) of two integers using GCD.

Greatest Common Factor Calculator

Compute the greatest common factor (GCF) using the Euclidean algorithm.

Factor Calculator

Analyze an integer by computing its prime factors and divisor counts.

Average Calculator

Compute arithmetic mean from a list of numbers quickly and accurately.

Mean, Median, Mode & Range Calculator

Compute mean, median, mode, and range to describe a dataset clearly.

Permutation & Combination Calculator

Calculate nCr and nPr to count arrangements and selections.

Rounding Calculator

Round values to a selected number of decimal places or significant digits.

Matrix Calculator

Perform common matrix operations such as addition, multiplication, transpose, and determinant-based checks.

Scientific Notation Calculator

Convert numbers to scientific notation and interpret them in decimal form.

Prime Factorization Calculator

Factor an integer into its prime components and show exponents.

Long Division Calculator

Perform long division to compute quotient and remainder with a clear step-by-step result.

P-Value Calculator

Estimate p-values for statistical tests using test statistic and distribution assumptions.

Big Number Calculator

Handle large integers and precise arithmetic for big-number calculations and probability counting.

Base64 Encode/Decode Calculator

Encode text to Base64 and decode Base64 back to readable strings safely for data transformation.

Everyday / Other Calculators

Age, time, passwords, and everyday utilities.

29 tools

Age Calculator

Find exact age in years, months, and days from a birth date.

Password Generator

Generate strong random passwords with length and character controls.

Time Duration Calculator

Find the duration between two dates and times.

Discount & Sale Calculator

Calculate sale prices, savings, and stacked discounts.

GPA Calculator

Compute weighted GPA from course grades and credit hours.

Grade Calculator

Find current course grade and the score needed on a final exam.

Fuel Cost Calculator

Estimate trip fuel cost from distance, MPG/L/100km, and fuel price.

Date Calculator

Calculate the difference between two dates and add or subtract a number of days.

Time Calculator

Convert between time units and compute time differences from start and end values.

Hours Calculator

Compute total hours worked or elapsed hours from start and end times with optional breaks.

Dice Roller

Roll virtual dice with a chosen number of sides and count results.

Conversion Calculator

Convert values between units using a selected conversion factor.

Gas Mileage Calculator

Estimate fuel economy (MPG) or fuel consumption from distance and fuel used.

Tip Calculator

Calculate tip amount and total bill using a tip percentage and optional split.

Mileage Calculator

Estimate remaining miles until your next service and calculate the next service odometer value.

Sleep Calculator

Plan bedtime using sleep cycles and a target wake-up time.

Day Counter

Count how many days are left until an event date or how many days have passed since it.

Concrete Calculator

Estimate concrete volume needed for a slab or simple footing from dimensions and thickness.

IP Subnet Calculator

Calculate subnet details such as network address, broadcast, and usable host range.

Bra Size Calculator

Estimate bra size from underbust and bust measurements using common sizing heuristics.

Voltage Drop Calculator

Estimate electrical voltage drop in a wire based on current, resistance, and length.

BTU Calculator

Estimate heating or cooling BTU requirements from area, climate assumptions, and insulation factors.

Square Footage Calculator

Calculate square footage for rectangular rooms and surfaces from length and width.

Love Calculator

Estimate a playful compatibility score from names using a simple, deterministic mapping method.

GDP Calculator

Estimate GDP using the expenditure approach: C + I + G + (X − M).

Horsepower Calculator

Convert between torque and horsepower and estimate horsepower from engine speed.

Resistor Calculator

Compute equivalent resistance for series and parallel resistor combinations and simple networks.

Ohm's Law Calculator

Use Ohm's law to compute voltage, current, or resistance in a simple resistive circuit.

Density Calculator

Calculate density from mass and volume, and convert between common measurement units.

Webmaster Calculators

Embeddable calculator widgets for your site.

2 tools

Webmaster

Mortgage Calculator Widget for Your Site

Generate embed code to place a mortgage calculator on your website.

Webmaster

Math Calculator Widget for Your Site

Generate embed code for a scientific calculator iframe on your website.