All 40 Calculators
Browse every free online calculator on Calnivo. Filter by category, or jump straight to the tool you need. All calculators run 100% in your browser — no sign-up, no data collected.
Financial Calculators
Plan loans, mortgages, investments and taxes with confidence.
Mortgage Calculator
Estimate your monthly mortgage payment, including principal, interest, taxes and insurance.
Loan Calculator
Calculate monthly payments, total interest and payoff for any fixed-rate loan.
Auto Loan Calculator
Figure out your monthly car payment and total interest over the loan term.
Interest Calculator
Compute simple and compound interest earned on a principal amount.
Payment Calculator
General payment calculator for loans with flexible compounding options.
Retirement Calculator
Project how much you will have saved by retirement based on contributions and growth.
Amortization Calculator
Generate a full amortization schedule showing principal and interest per period.
Investment Calculator
Estimate the future value of an investment with regular contributions.
Inflation Calculator
See how the purchasing power of money changes over time due to inflation.
Finance Calculator
Solve for any variable in the TVM equation: PV, FV, PMT, rate or periods.
Income Tax Calculator
Estimate federal income tax owed based on taxable income and brackets.
Compound Interest Calculator
See how compound interest grows your savings over time with regular deposits.
Salary Calculator
Convert between hourly, daily, weekly, monthly and annual salary.
Interest Rate Calculator
Determine the effective interest rate of a loan from payment and term.
Sales Tax Calculator
Quickly add sales tax to any purchase amount.
Fitness & Health Calculators
Track BMI, calories, body fat and key wellness metrics.
BMI Calculator
Calculate your Body Mass Index and see which weight category you fall into.
Calorie Calculator
Estimate daily calorie needs based on activity level and goals (TDEE).
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy circumference method.
BMR Calculator
Calculate your Basal Metabolic Rate — calories burned at complete rest.
Ideal Weight Calculator
Find your ideal body weight using several well-known formulas.
Pace Calculator
Compute your running pace, time or distance.
Pregnancy Calculator
Estimate your pregnancy timeline and key milestones from your last period.
Pregnancy Conception Calculator
Estimate the likely date of conception based on the due date or birth date.
Due Date Calculator
Calculate your baby's estimated due date from your last menstrual period.
Math Calculators
Scientific tools for fractions, percentages and geometry.
Scientific Calculator
A full scientific calculator with trig, logarithms, powers and memory.
Fraction Calculator
Add, subtract, multiply and divide fractions with step-by-step results.
Percentage Calculator
Solve common percentage problems: what is X% of Y, percent change, and more.
Random Number Generator
Generate random numbers within a custom range, with optional uniqueness.
Triangle Calculator
Solve triangles: find missing sides, angles, area and perimeter.
Standard Deviation Calculator
Compute mean, variance and standard deviation for a set of numbers.
Other Calculators
Everyday utilities for dates, time, grades and conversions.
Age Calculator
Calculate exact age in years, months, days and total days lived.
Date Calculator
Add or subtract days from a date, or find the duration between two dates.
Time Calculator
Add and subtract hours, minutes and seconds.
Hours Calculator
Calculate hours worked between two times, including break deductions.
GPA Calculator
Compute your grade point average across courses with credit weighting.
Grade Calculator
Find the final grade needed on remaining work to hit a target average.
Concrete Calculator
Estimate concrete volume needed for slabs, footing and columns in cubic yards.
Subnet Calculator
Calculate network, broadcast, subnet mask and host range from an IP/CIDR.
Password Generator
Create strong, random passwords with custom length and character sets.
Conversion Calculator
Convert between units of length, weight, temperature and volume.
Why Calnivo?
Every calculator runs locally in your browser — no backend, no database, no tracking. Results are estimates for planning purposes. For financial or medical decisions, consult a qualified professional. Read our privacy policy and terms.