Free online calculators,
done properly.
80+ precise calculators for mortgages, loans, taxes, BMI, calories, fractions, statistics, and the everyday arithmetic in between. Free, instant, no sign-up.
Scientific Calculator
Eighty-three calculators,
precisely tuned.
Financial Calculators
Mortgage, loan, investment, tax, and other financial tools.
Estimate your monthly mortgage payment with taxes, insurance, and PMI.
Calculate payments for amortized, deferred, and bond loans.
Open calculatorSimple and compound interest calculations with schedule.
Open calculatorFind monthly payment, term, or interest rate for any loan.
Open calculatorProject retirement savings and income.
Full amortization schedule for fixed-rate loans.
Open calculatorCalculate investment growth with compound interest.
Adjust money amounts for inflation over time.
Open calculatorSolve for PV, FV, rate, payment, or periods.
Open calculatorFitness & Health
BMI, calorie, body fat, pregnancy, and health calculators.
Calculate Body Mass Index for adults.
Estimate daily calorie needs based on activity level.
Open calculatorEstimate body fat percentage using measurements.
Open calculatorCalculate Basal Metabolic Rate (calories at rest).
Open calculatorFind ideal body weight ranges for your height.
Calculate running pace, distance, or time.
Open calculatorU.S. Army body fat percentage estimation.
Calculate lean body mass from total weight and body fat.
Open calculatorFind the healthy weight range for your height.
Open calculatorMath Calculators
Scientific, fraction, geometry, statistics, and algebra tools.
Full-featured scientific calculator with trig, log, and more.
Add, subtract, multiply, and divide fractions.
Open calculatorCalculate percentages, increases, and decreases.
Open calculatorGenerate random numbers within a range.
Open calculatorCalculate percent error between expected and actual values.
Calculate powers and roots of numbers.
Open calculatorPerform arithmetic in binary number system.
Calculate radioactive decay and half-life problems.
Open calculatorSolve quadratic equations using the quadratic formula.
Open calculatorLatest Articles
Tips, guides, and insights about calculators and everyday numbers.
Inflation Calculator: Measure Money's Real Value
Learn how an inflation calculator shows what money was worth in the past and will be worth in the future, plus how…
Binary Calculator: Convert Decimal to Binary
Learn how a binary calculator converts decimal numbers to binary and back, with step-by-step methods, binary addition, and quick conversion tricks.
Army Body Fat Calculator: The 2026 WHtR Rule
The Army body fat test has changed. Learn how the new waist-to-height standard works, how to check it at home, and how…
Investment Calculator: Grow Wealth Step by Step
Learn how an investment calculator projects growth from savings and returns, how fees and inflation change results, and how to plan step…
Exponent Calculator: Powers and Root Rules
Learn how an exponent calculator handles powers, negative and fractional exponents, and roots, plus the seven exponent rules every student should know.
Pace Calculator: Plan Your Running & Marathon
Learn how a pace calculator works, convert pace to finish times for 5K to marathon, predict race results, and plan smart splits…
Frequently Asked Questions
Find answers here. Can't find what you're looking for? Contact us.
General Questions
Yes — every calculator on ILoveCal is completely free. No sign-up, no subscription, no hidden fees. Just open the tool and get your answer instantly.
Our calculators use standard formulas and provide accurate estimates. For important financial or medical decisions, we recommend verifying results with a licensed professional.
No account is needed. Simply navigate to any calculator, enter your values, and get instant results. Your data is never stored on our servers.
Yes. Timezones and daylight saving rules can affect time-based calculations. Date and time tools run in your browser's local timezone for the most relevant results.
Financial Calculators
Banks may include origination fees, insurance, escrow adjustments, and institution-specific rounding rules. Our results are standard-formula estimates and may differ slightly.
We use the standard amortisation formula: M = P[r(1+r)ⁿ] / [(1+r)ⁿ−1], where P is the principal, r is the monthly rate, and n is the total number of payments.
No — the compound interest calculator shows gross growth without deducting taxes or fees. Consult a financial advisor for tax-adjusted projections.
Health & Fitness
BMI is a population-level screening tool, not a precise measure of individual health. It doesn't account for body composition, so athletes with high muscle mass may be misclassified. Consult a doctor for personalised guidance.
TDEE (Total Daily Energy Expenditure) is the total number of calories you burn each day. Knowing your TDEE helps you set accurate calorie targets for weight loss, maintenance, or gain.
We use Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period. This is an estimate — actual delivery dates vary by about 2 weeks in either direction.
Math Tools
An "Error" appears when the expression is invalid — common causes are division by zero, square root of a negative number, or logarithm of zero or a negative number. Clear and re-enter the expression.
DEG (degrees) and RAD (radians) are two units for measuring angles. Most everyday calculations use degrees. Radians are standard in higher mathematics and physics. Switch using the toggle at the top of the scientific calculator.
Using This Site
Use the search bar at the top of the home page. Type a keyword like "mortgage", "BMI", or "percentage" and matching calculators will appear instantly in the dropdown.
Yes — all calculators are fully responsive and tested on smartphones and tablets. The scientific calculator has a simplified keypad layout on smaller screens for easier use.
Use our Contact page to report bugs or suggest new calculators. We read every message and aim to respond within 2 business days.