Mortgage Calculator
Monthly payment, schedule, interest.
Finance & Money
Plan loans, mortgages, savings, and everyday spending.
Loan Calculator
Payment, interest, amortization.
Tip Calculator
Tip %, split, rounding, CSV.
Currency Converter
Convert currencies with precision.
Federal Income Tax
Estimate U.S. federal tax.
Savings Calculator
Goal, deposits, interest growth.
General Math & Everyday
Quick math and conversions you actually use.
Percentage Calculator
Percent of, change, increase/decrease.
Unit Converter
Length, area, volume, weight, temperature.
Date Calculator
Add/subtract days, business days.
Age Calculator
Exact age today or on a date.
Age Difference
Years, months, days between birthdays.
Countdown
Time until an event, CSV export.
Health & Fitness
Check your numbers and set targets that make sense.
BMI Calculator
Body mass index with ranges.
BMR & Calorie
Daily calories by activity level.
Macro Calculator
Protein, carbs, fat targets.
Water Intake
Daily water needs with activity & climate.
Body Fat
Estimate using waist/neck/hip.
Pace Calculator
Run pace, time, distance math.
Students & Education
Grades, GPA, scientific notation, and more.
GPA Calculator
Grade point average with weights.
Grade Calculator
What score you need on the final.
Scientific Notation
Convert to/from scientific notation.
Percentage Calculator
Percent increase/decrease & of.
Countdown
Time to exams or deadlines.
Unit Converter
Common units for homework.
Construction & Real Estate
Estimate materials fast for DIY and pro projects.
Concrete Calculator
Volume & bag counts.
Tiles Calculator
Tile counts and waste factor.
Square Footage
Room and lot areas.
Unit Converter
Inches/feet, yards, metric.
Mortgage Calculator
Payments for real estate projects.
Paint Calculator
Gallons by wall size & coats.
Taxes
Straightforward calculators for U.S. federal and state taxes.
Federal Income Tax
Estimate U.S. federal tax.
Sales Tax Calculator
Add or back out sales tax.
FAQ
Are these calculators free to use?
Yes. Every tool on Click & Calc is free. No sign-up and no paywalls.
How accurate are the results?
We use standard formulas, current conventions, and clear assumptions. Each tool page explains its method. Confirm big decisions with a professional.
Can I request a new calculator?
Yes. Use the contact link below and tell us what you need.