Free Online Calculators
35 free calculators covering age, BMI, loans, mortgage, tax, GPA, ROI and more. Every page includes a comparison table, use cases, and an editorial verdict.
Free Loan Calculator 2026 - Free & Easy
Use our free loan calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorAge Calculator
Use our free age calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorAge Calculator for High School
Age calculator for high school students: years, months, days since birth. Useful for age-restricted forms, exams, and ID checks.
CalculatorAmortization Calculator
Use our free amortization calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorAuto Loan Calculator
Use our free auto loan calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorBudget Calculator
Use our free budget calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorCompound Interest Calculator
Use our free compound interest calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorCompound Interest Calculator for Small Business
Compound interest calculator for small businesses. Project savings, business reserves, and reinvestment growth with monthly contributions and variable rates.
CalculatorCredit Card Payoff Calculator
Use our free credit card payoff calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorDate Difference Calculator - Days Between Two Dates
Calculate the number of days, weeks, months, and years between any two dates. Includes business-day mode, weekend handling, and age in years/months/days.
CalculatorDiscount Calculator
Use our free discount calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorDiscount Calculator for Beginners
Step-by-step discount calculator for beginners. Learn how to compute sale price, savings, and final total for any percentage off.
CalculatorEmergency Fund Calculator
Use our free emergency fund calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorFHA Loan Calculator Texas (Self-Employed)
Texas FHA loan calculator for self-employed borrowers: 2026 county loan limits, 2-year self-employment history, and how to qualify with variable income.
CalculatorFree Loan Calculator
Use our free loan calculator to estimate monthly payments, total interest, and full amortization with no signup and no email.
CalculatorGPA Calculator
Use our free gpa calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorInflation Calculator
Use our free inflation calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorMortgage Calculator (Instant)
Instant mortgage calculator with PMI, taxes, and insurance. Get the monthly payment, total interest, and full amortization in one click.
CalculatorNet Worth Calculator
Use our free net worth calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorPaycheck Calculator
Use our free paycheck calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorRetirement Calculator
Use our free retirement calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorSalary Calculator 2026
Convert gross annual salary to hourly, monthly, biweekly, and weekly pay for 2026. Includes federal tax estimate and FICA deductions.
CalculatorSquare Footage Calculator - Area & Material Estimator
Calculate square footage of rooms, walls, and irregular shapes. Includes material estimators for flooring, paint, and tile with waste-factor adjustment.
CalculatorStudent Loan Calculator
Use our free student loan calculator to estimate values instantly. No signup, accurate, mobile-friendly, works offline. Try it now.
CalculatorTax Calculator (No Signup)
Estimate 2025 federal income tax with no signup, no account, no email. Filing status, taxable income, deductions, and credits supported.
CalculatorBMI Calculator
Free BMI calculator using the standard formula. Enter height and weight, get BMI and category.
CalculatorFHA Loan Calculator Texas 2026
Texas FHA loan calculator for 2026. Enter home price, down payment, and credit score to get the monthly payment, MIP, and total interest.
CalculatorMortgage Calculator
Free mortgage calculator with PMI, taxes, and insurance. Updates as you type. Includes amortization.
CalculatorPercentage Calculator
Free percentage calculator. Compute X% of Y, percentage change, or what percent X is of Y.
CalculatorROI Calculator
Free ROI calculator. Enter initial investment and final value, get return on investment percentage.
CalculatorSalary Calculator
Free salary calculator. Convert annual to hourly, monthly, weekly, and biweekly. After-tax estimate included.
CalculatorTax Calculator
Free 2025 tax calculator. Federal and state brackets. Self-employment and capital gains included.
CalculatorTime Calculator
Time Calculator Add, subtract, and convert hours, minutes, and seconds.
CalculatorTip Calculator
Free tip calculator. Enter bill amount, tip percentage, and number of diners. Splits the total.
CalculatorUnit Calculator
Unit Calculator Perform multi-step unit math and combine conversion factors into one answer.
Which calculator should you use?
All 35 calculators on this site follow the same editorial standard: verified formula, worked examples, side-by-side comparison, and a verdict at the bottom of every page. No filler. No auto-generated fluff. Pick your category, pick your tool, get the number.
Standard reference formulas only
Every calculator uses the standard reference implementation of its formula. Edge cases return defined values or explicit warnings, not silent errors.
35 calculators across 5 domains
Math, health, finance, time, and date math — the domains where people most often need quick, reliable calculations.
Nothing leaves your browser
All calculations run client-side. No inputs are ever transmitted to any server.
Results update as you type
No submit button. No server round-trip. The result updates in real time as you change any input.