Free Online Calculators for Finance, Health & Math

Mortgage Affordability Calculator

Calculate home purchasing power with taxes, insurance & PMI

Life Insurance Needs Calculator (DIME)

Calculate family coverage gap with interactive DIME modeling

Term vs. Whole Life Insurance Calculator

Compare 20-year term + investing difference vs whole life cash value

Loan EMI & Amortization Calculator

Interactive month-by-month repayment schedule with extra payments

Auto Loan & Car Payment Calculator

Compare 36 to 84 month terms with trade-in value & sales tax

Debt Payoff Calculator (Snowball vs Avalanche)

Compare accelerated debt strategies and interest savings

Compound Interest Calculator

Visualize multi-year compound interest and wealth accumulation

Credit Card Payoff Calculator

Determine time to debt-free status under minimum payments

Federal Tax Bracket Calculator

Calculate effective vs marginal progressive tax rates

Investment Return Calculator

Model stock market compound returns with regular contributions

Savings Goal Calculator

Calculate monthly savings needed to hit financial independence

Net Worth Calculator

Track liquid assets, home equity, and debt liabilities

401(k) Retirement Calculator

Calculate 401(k) growth with employer match, salary raises, and compound interest

Roth IRA Calculator

Calculate tax-free retirement growth and compare Roth vs Traditional IRA returns

Traditional IRA Calculator

Calculate upfront tax deduction savings and tax-deferred retirement growth

Social Security Benefits Calculator

Compare monthly retirement payouts when claiming at age 62, 67, or 70

Defined Benefit Pension Calculator

Calculate annual state, federal, or corporate defined-benefit pension annuity

Student Loan Repayment Calculator

Calculate monthly college debt payments, total interest, and payoff timeline

College Tuition & Savings Calculator

Estimate future 4-year tuition inflation and required 529 plan savings

Mortgage Refinance Break-Even Calculator

Calculate monthly savings and break-even months when refinancing a home loan

HELOC Payment Calculator

Calculate interest-only draw period and principal repayment for a Home Equity Line of Credit

FHA Loan Calculator

Calculate FHA mortgage payments with upfront and annual Mortgage Insurance Premiums (MIP)

VA Mortgage Calculator

Calculate 0% down VA home loans with funding fee and zero monthly PMI

Car Lease Payment Calculator

Calculate monthly vehicle lease payments with money factor, MSRP, and residual value

Return on Investment (ROI) Calculator

Calculate net profit, total percentage ROI, and annualized rate of return

Internal Rate of Return (IRR) Calculator

Calculate internal rate of return for multi-period capital investments

Certificate of Deposit (CD) Calculator

Calculate CD compound interest, maturity value, and early withdrawal penalties

Bond Yield to Maturity (YTM) Calculator

Calculate bond current yield, yield to maturity (YTM), and coupon payments

Present Value (PV) Calculator

Calculate the present discounted value of future cash flows or lump sums

Future Value (FV) Calculator

Calculate the future compounded value of investments with periodic additions

Required Minimum Distribution (RMD) Calculator

Calculate mandatory annual IRS retirement account distributions by age

Home Down Payment Savings Calculator

Calculate required down payment, closing costs, and monthly savings timeline

SaaS Metrics & Rule of 40 Calculator

YouTube AdSense Earnings & RPM Calculator

Freelance Hourly Rate & Billable Hours Calculator

E-Commerce & Payment Gateway Fee Calculator

Home Solar Panel Payback & ROI Calculator

Crypto Dollar-Cost Averaging (DCA) Calculator

High-Yield Savings Account (HYSA) Calculator

StockX Seller Fee & Payout Calculator

Poshmark Seller Fee & Earnings Calculator

eBay Seller Fee & Profit Calculator

Mercari Seller Fee & Direct Deposit Calculator

50/30/20 Rule Budget & Spending Calculator

FIRE (Financial Independence, Retire Early) Calculator

Emergency Fund Safety Net & HYSA Interest Calculator

Rental Property Cash Flow & Cap Rate Calculator

70% Rule House Flipping & Maximum Offer Calculator

BRRRR Method Calculator (Buy, Rehab, Rent, Refinance, Repeat)

Life Insurance Needs Calculator (DIME)

Calculate exact family financial protection using DIME framework

Term vs. Whole Life Insurance Calculator

Compare 20-year term + investing difference vs whole life cash value

Car Insurance Estimator

Estimate target car insurance premiums based on vehicle and driving record

Mortgage & PITI Insurance Calculator

Calculate home affordability with property taxes and PMI insurance

BMI (Body Mass Index) Calculator

Official WHO metric and imperial weight category index

Calorie, TDEE & Macro Deficit Calculator

Daily calories for fat loss, muscle gain & macro splits

Running Pace & Marathon Split Calculator

Calculate min/mile and min/km splits for 5K to 26.2 marathons

Pregnancy Due Date & Trimester Timeline

Estimated delivery date and gestational development calendar

Sobriety & Recovery Milestone Tracker

Track clean days, health milestones & financial savings

Rehab Cost & Treatment Estimator

Estimate detox, inpatient, and outpatient recovery expenses

Body Fat Percentage Calculator (US Navy Method)

Calculate body fat percentage and fat vs lean mass using circumference measurements

Basal Metabolic Rate (BMR) Calculator

Calculate resting daily calories burned at complete physical rest

Ideal Body Weight Calculator

Compare ideal body weight estimates using Devine, Robinson, and Miller formulas

Lean Body Mass (LBM) Calculator

Calculate lean tissue weight and fat mass using Boer and James equations

Ovulation & Fertility Window Calculator

Calculate estimated ovulation day, fertile window, and next menstrual cycle

Conception Date Calculator

Estimate the exact conception date based on due date, ultrasound, or last period

Menstrual Period & Cycle Tracker

Predict your next 3 menstrual periods and PMS symptom phases

Pregnancy Weight Gain Calculator

Track healthy gestational weight gain guidelines by trimester

One Rep Max (1RM) Calculator

Calculate 1RM strength and training percentage percentages across Brzycki, Epley, and Lombardi formulas

Target Heart Rate & Training Zones Calculator

Calculate aerobic, anaerobic, and VO2 max heart rate zones using the Karvonen method

Blood Alcohol Content (BAC) Calculator

Calculate estimated blood alcohol concentration and sober-up timeline using Widmark's formula

Macronutrient Split Calculator

Calculate daily protein, carbohydrate, and fat targets for cutting, bulking, or maintaining

Daily Protein Requirement Calculator

Calculate optimal protein intake in grams for muscle building, endurance, or fat loss

Daily Water Intake & Hydration Calculator

Calculate optimal daily fluid intake based on body weight, climate, and exercise

Body Type & Shape Calculator

Determine body frame shape and Waist-to-Hip Ratio (WHR) health risk

Calories Burned by Activity Calculator

Calculate calories burned across 20+ sports using Metabolic Equivalent (MET) scores

Intermittent Fasting Schedule Calculator

Calculate eating and fasting windows for 16:8, 18:6, 20:4, and OMAD diets

GFR Kidney Function Calculator (CKD-EPI)

Calculate estimated Glomerular Filtration Rate (eGFR) and kidney disease staging

Caffeine Half-Life & Sleep Clearance Calculator

Calculate remaining caffeine in your bloodstream and optimal cutoff time for sleep

REM Sleep Cycle & Bedtime Calculator

Calculate optimal wake-up times and bedtimes based on 90-minute REM cycles

Full Scientific Calculator

Trigonometry, logarithms, exponents, and radian conversions

Standard Deviation & Variance Calculator

Sample s and population σ with step-by-step deviations

Fraction Calculator & Step-by-Step Solver

Add, subtract, multiply, divide with lowest term reduction

Percentage Calculator (3-in-1)

Percentage increase, decrease, and what percentage of X is Y

Prime Number Checker & Factorizer

Deterministic prime verification and factor analysis

GCD & LCM Calculator

Greatest Common Divisor & Least Common Multiple with Euclidean algorithm

Triangle Geometry & Trig Solver

Calculate triangle area, perimeter, angles, and sides using Heron's formula and trigonometry

3D Geometric Volume Calculator

Calculate volume for cylinders, spheres, cones, rectangular prisms, and pyramids

3D Surface Area Calculator

Calculate total and lateral surface area for geometric 3D shapes

Circle Area, Circumference & Diameter Calculator

Calculate circle radius, diameter, circumference, and area from any single dimension

Quadratic Equation Solver (ax² + bx + c = 0)

Find roots, vertex, discriminant, and factoring for quadratic equations

Percent Error Calculator

Calculate experimental vs theoretical percent error and absolute variance in lab experiments

Number Sequence & Series Calculator

Calculate arithmetic and geometric progressions, nth term, and sum of series

Exponent & Power Calculator

Calculate powers, negative exponents, fractional roots, and large numbers

Logarithm Calculator (log, ln, log2)

Calculate natural log (ln), common log (log10), and custom base logarithms

Slope & Line Equation Calculator

Calculate line slope (m), angle of inclination, and slope-intercept equation y = mx + b

Midpoint & Distance Formula Calculator

Calculate the exact midpoint and geometric distance between two coordinate points

Pythagorean Theorem Calculator (a² + b² = c²)

Calculate right triangle hypotenuse (c) or leg lengths (a, b) with exact radicals

Matrix Determinant & Inverse Calculator (2x2 & 3x3)

Calculate determinant, trace, and inverse for 2x2 and 3x3 square matrices

Permutations & Combinations (nPr & nCr) Calculator

Calculate nPr permutations and nCr combinations with order importance

Probability & Odds Calculator

Calculate independent events, mutually exclusive probabilities, and odds ratios

Random Number Generator (RNG)

Generate cryptographically random numbers, integers, and lucky picks

Virtual Dice Roller (d4, d6, d8, d10, d12, d20, d100)

Roll tabletop RPG dice with advantage, disadvantage, and modifier totals

Virtual Coin Flipper & Toss Simulator

Flip a coin with streak counters, heads vs tails ratios, and probability distribution

Binary Arithmetic & Bitwise Calculator

Add, subtract, and perform bitwise AND, OR, XOR operations on binary numbers

Hexadecimal Calculator & ASCII Converter

Add, subtract, and convert hexadecimal values to decimal and binary

Ratio & Aspect Ratio Scaler Calculator

Solve ratios A:B = C:X and scale video/image aspect ratios

Scientific Notation Calculator

Convert decimals to scientific notation (a × 10^b) and perform multiplication/division

Significant Figures (Sig Fig) Calculator

Count significant digits and round numbers according to scientific rules

Z-Score & Normal Distribution Calculator

Calculate standard score (Z), percentile ranking, and probability from a normal curve

Confidence Interval (CI) Calculator

Calculate sample mean confidence intervals (90%, 95%, 99%) and margin of error

Work Hours & Time Card Calculator

Weekly timesheet with lunch deduction, overtime & gross pay

College & High School GPA Calculator

Weighted 4.0 semester GPA with academic honors status

Final Exam & Course Grade Calculator

Calculate exact score needed on final exam to get target grade

Exact Age & Chronological Calculator

Years, months, days, minutes, and milestone birthdays

Tip & Bill Split Calculator

Calculate tip percentages and split checks among dining parties

Discount & Sales Tax Calculator

Calculate markdown percentage savings and final checkout price

Freelance Rate Calculator

Determine billable hourly and daily rates to hit target take-home salary

Concrete Slab & Footing Calculator

Calculate cubic yards, cubic feet, and 60lb/80lb bags for slabs and footings

Square Footage & Multi-Room Calculator

Calculate square feet and square meters for flooring, turf, and real estate

Mulch, Soil & Landscaping Calculator

Calculate cubic yards and 2 cu ft bags of mulch or topsoil for garden beds

Paint Coverage & Gallons Calculator

Calculate gallons of paint needed with door and window surface deductions

Floor & Wall Tile Calculator

Calculate tile count, boxes needed, and grout area with cutting waste

Drywall Sheet & Joint Compound Calculator

Calculate 4x8 and 4x12 sheetrock panels, joint compound buckets, and drywall screws

Gravel & Crushed Stone Calculator

Calculate tons and cubic yards of aggregate, gravel, and crushed stone for driveways

Air Conditioner BTU Sizing Calculator

Calculate required cooling BTU capacity based on room square footage, ceilings, and sun exposure

IP Subnet & CIDR Prefix Calculator

Calculate IPv4 subnet masks, usable host IP ranges, network and broadcast addresses

Bandwidth & File Download Time Calculator

Calculate download and upload duration for files across internet connection speeds

Date Difference & Duration Calculator

Calculate days, weeks, months, and business days between two dates

Time Duration & Clock Difference Calculator

Add, subtract, and calculate elapsed hours, minutes, and seconds between timestamps

Appliance Electricity Cost Calculator

Calculate electricity running cost per hour, day, month, and year based on wattage

Sales Tax & Pre-Tax Price Calculator

Calculate state/local sales tax additions and reverse calculate pre-tax prices

VAT Calculator (Inclusive & Exclusive)

Add VAT or remove VAT from gross and net prices for international invoices

Bra Size & Cup Measurement Calculator

Calculate accurate band and cup size from underbust and bust measurements

Dog Age in Human Years Calculator

Calculate canine age to human years using scientific epigenetic canine aging curves

Cat Age in Human Years Calculator

Calculate feline chronological age to equivalent human life stages

Love Compatibility & Name Match Calculator

Calculate relationship name compatibility score and fun romantic synergy

Cooking & Kitchen Measurement Converter

Convert cups, tablespoons, teaspoons, fluid ounces, milliliters, and grams

Baking Recipe Scaler & Servings Multiplier

Scale recipe ingredient quantities up or down by serving size or pan dimensions

Road Trip Fuel Cost & Gas Calculator

Calculate road trip fuel expense, gallons needed, and cost per passenger

Electric Vehicle (EV) Charging Cost Calculator

Calculate EV home charging cost, full battery expense, and cost per mile vs gas

Historical Inflation & Purchasing Power Calculator

Calculate purchasing power decay and inflation-adjusted dollar values over time

Compound Annual Growth Rate (CAGR) Calculator

Calculate geometric mean growth rate (CAGR) for business revenue and investments

Break-Even Sales & Unit Volume Calculator

Calculate units and revenue needed to cover fixed overhead and start profiting

Restaurant Bill Split & Tip Calculator

Split restaurant checks evenly or itemized with tip and sales tax percentages

Wedding Budget Breakdown & Estimator

Allocate wedding expenses across venue, catering, photography, and attire

Boat & Marine Loan Financing Calculator

Calculate marine loan monthly payments, interest, and terms up to 20 years

Estate Tax & Inheritance Exemption Calculator

Calculate federal estate tax liability and lifetime unified gift exemption

Electric Vehicle (EV) vs. Gas Fuel Cost Calculator

Final Exam Grade Needed Calculator

Weighted & Unweighted GPA Calculator

SAT to ACT Score Concordance Converter

Cups to Grams Baking & Ingredient Density Converter