Free Online Calculators for Money, Math, Time & Everyday Life
Calculate loans, percentages, dates, work hours, construction materials, grades, conversions and more. 155 free calculators with instant results and no sign-up required.
Popular Calculators
Start with one of the tools people use most often.
Mortgage Calculator
Estimate monthly mortgage payments.
Percentage Calculator
Calculate percentages and changes.
Time Card Calculator
Total work hours and break time.
Final Grade Calculator
Find the score needed on a final exam.
Concrete Calculator
Estimate concrete for a project.
Loan Calculator
Calculate payments and interest.
Amortization Calculator
Build a complete payment schedule.
GPA Calculator
Calculate current or projected GPA.
Calculate the questions people ask every day
Start with a focused topic for work hours, grades, concrete, percentages or mortgage payoff. Each topic connects calculators with worked examples and quick answers.
Work Hours & Time Cards
Lunch breaks, decimal hours, weekly totals and overtime estimates.
Explore work hours → SchoolGrades & Final Exams
Find the score you need on a final and compare common grade targets.
Explore grades → Home & constructionConcrete & Materials
Cubic yards, slab examples, waste allowances and premix bag estimates.
Explore concrete → Everyday mathPercentages & Discounts
Percent-of questions, reverse percentages, discounts and percent change.
Explore percentages → MoneyMortgage Payoff & Amortization
Payments, extra principal, payoff time and interest-saving scenarios.
Explore mortgages →Browse Calculators by Category
Find the right calculator for your needs.
Money & Finance
Loans, savings, interest and everyday money decisions
28 calculatorsMath
Percentages, algebra, geometry, fractions and statistics
33 calculatorsDates & Time
Ages, date differences, workdays and time calculations
14 calculatorsHome & Construction
Materials, measurements and project estimates
27 calculatorsBusiness
Pricing, profitability, marketing and business performance
19 calculatorsConversions
Convert everyday measurements quickly
18 calculatorsSchool
Grades, GPA, test scores and classroom calculations
8 calculatorsHealth & Fitness
Common health and fitness estimates
8 calculatorsWhat Do You Need to Calculate?
Choose a common question and go straight to the calculator that answers it.
Loans, mortgages & savings
How much will my mortgage payment be? →How long will it take to pay off my mortgage? →How much interest will my money earn? →How much house can I afford? →Percentages & everyday math
What percentage is one number of another? →How do I calculate percentage change? →How do I calculate an average? →How do I solve a ratio? →Dates, ages & work hours
How many days are between two dates? →How old am I exactly? →How many hours did I work? →What date is 90 days from a date? →Materials & project quantities
How much concrete do I need? →How much mulch do I need? →How much flooring do I need? →How many cubic yards do I need? →Helpful Calculator Guides
Learn the formulas and methods behind common calculations.
How Mortgage Payments Are Calculated
Understand principal, interest and how an amortization schedule changes over time.
Read guide → MathHow to Calculate Percentages
Learn percentage increase, decrease, difference and percent-of-number formulas.
Read guide → TimeHow to Calculate Work Hours
Convert clock-in and clock-out times into total paid hours and handle unpaid breaks.
Read guide → ConstructionHow Much Concrete Do I Need?
Estimate slabs, footings and other pours by converting dimensions into cubic yards.
Read guide →Calculations You Can Understand
Useful tools should make the method as clear as the answer.
Use the calculator library without paying.
Start calculating without creating a login.
Methods and assumptions are shown where practical.
Use the tools on phones, tablets and computers.
Calculations run directly in your browser.
Free Online Calculators for Everyday Questions
ERICH Calculators brings together more than 150 practical tools for money and finance, math, dates and time, home and construction, business, school, health and conversions. Each calculator is designed to get you to a clear result quickly while also explaining the formula or method where it is useful.
Not sure which tool you need? Browse all calculators, explore calculator topics, or use the search box above to jump directly to a specific calculation.
