Calculators

CalcNova’s calculators cover the math most people need day to day, from quick arithmetic to dedicated tools for specific problems. The homepage scientific calculator handles general calculations plus graphing, matrix, fraction, percentage, standard deviation, and triangle modes, while the separate pages below each focus on one job and explain every result. Everything runs free in your browser with no sign-up.

Calculators built into the homepage

These modes all live inside the online scientific calculator on the CalcNova homepage. Open the page and switch modes to use them.

  • Scientific Calculator — handles arithmetic, trigonometry, logarithms, powers, roots, and more, with degree and radian modes for angle work. The best starting point for most everyday and classroom calculations.
  • Graphing Calculator — plots up to three functions at once with pan and zoom, so you can see where curves cross zero or how changing a value shifts a graph. Useful for building intuition in algebra and pre-calculus. A full standalone version is on the Graphing Calculator page.
  • Matrix Calculator — adds, subtracts, and multiplies matrices up to 4 by 4, and finds determinants, inverses, and transposes without writing out each step by hand. Built for linear algebra homework and quick checks.
  • Fraction Calculator — works with mixed numbers using addition, subtraction, multiplication, and division, simplifying every result automatically. A handy mode when you need exact fraction answers instead of decimals.
  • Percentage Calculator — finds percentages, percentage change, and what one number is as a share of another. Good for discounts, tips, grades, and any quick share calculation.
  • Standard Deviation Calculator — enter a list of numbers to see how spread out they are at a glance. Useful for a quick sense of variability before running a fuller analysis.
  • Triangle Calculator — solves triangles from the sides and angles you already know. A quick way to check geometry homework or find a missing side without reaching for formulas.

    • Separate calculator pages

    Each of these has its own page with a focused tool, worked examples, and an explanation of the method behind the answer.

    • Right Triangle Calculator — solves for the sides, angles, and area of a right triangle when you know any two values besides the right angle. Built for geometry problems where the Pythagorean theorem and trigonometric ratios do the heavy lifting.
    • Geometry — Interactive geometry board: points, lines, circles, triangles and polygons with live lengths, angles and areas.
    • 6 Month Calculator — finds the exact date six months from any start day, with the weekday, total days, weeks, and weekdays counted for you. Made for probation periods, lease reviews, warranties, and other half-year deadlines.
    • Equation Solver — solves linear equations and quadratic equations with the discriminant and each root shown. A focused tool for algebra practice and checking your work on equations in x.
    • Graphing Calculator — Plot functions and see roots, intersections and turning points, with sliders, a values table and PNG export.
    • Statistics Calculator — paste a list of numbers to get the mean, median, mode, range, variance, and both population and sample standard deviation in one table. Designed for students and anyone summarizing a small data set.
    • Age Calculator — works out an exact age in years, months, and days from a birth date to any given date, plus total days lived and the countdown to the next birthday. Useful for forms, milestones, and curiosity.
    • Fractions Calculator — add, subtract, multiply and divide fractions and mixed numbers with simplified answers, decimals and step-by-step working. Example: 1 1/2 + 2/3 = 13/6 = 2 1/6.
    • AdSense Revenue Calculator — estimates ad earnings from pageviews and Page RPM. Example: 100,000 pageviews at $5 RPM = $500.
    • Complex Numbers Calculator — adds, subtracts, multiplies and divides complex numbers with each step shown. For example, (1+2i)+(3+4i) = 4+6i.
    • Percentage Calculator – works out X% of Y, what-share percentages, and percent change. Example: 20% of 200 = 40.
    • Discount Calculator – shows the discount amount, the sale price and what you save from any percent-off deal. Example: $80 at 25% off → you save $20 and pay $60.
    • Tip Calculator – splits restaurant bills with tip by person in one step. Example: $50 bill + 20% tip split by 2 → $30 each.
    • Loan Calculator – works out the monthly payment, total interest and total paid for any loan from the amount, rate and term. Example: $10,000 at 5% for 12 months → $856.07 per month.
    • Compound Interest Calculator – grows a starting amount with yearly, monthly or daily compounding and shows the future value and interest earned. Example: $1,000 at 5% for 2 years → $1,102.50.
    • Mortgage Calculator – works out the monthly payment, loan amount and total interest for a home loan from the price, down payment, rate and term. Example: $200,000 home with $40,000 down at 6% for 30 years → $959.28 per month.
    • BMI Calculator – checks body mass index in US or metric units with the weight category. Example: 70 kg at 175 cm → BMI 22.9 (Normal).
    • Body Fat Calculator – estimates body fat percentage from tape measurements with the U.S. Navy method, plus a BMI-based estimate. Example: a man with a 34 in waist, 16 in neck, and 70 in height → 15.5% body fat (Fitness).
    • Calorie Calculator – works out your BMR and daily calories to maintain, lose, or gain weight with the Mifflin-St Jeor equation. Example: man, 30, 70 kg, 175 cm, moderately active → BMR 1,648.75 kcal/day, 2,555.56 kcal to maintain.
    • Pregnancy Calculator – estimates your due date from your LMP or a known due date, with gestational week and trimester. Example: LMP 1 January 2026 → due date 8 October 2026.
    • Date Difference Calculator – counts the years, months, days and total days between two dates. Example: Jan 1 to Mar 1, 2024 → 2 months, 60 days total.
    • Random Number Generator – picks a whole number between any minimum and maximum, both ends included. Example: min 1, max 100 → 42.
    • Roman Numeral Converter – converts numbers to Roman numerals and back for 1 to 3999. Example: 2026 = MMXXVI.
    • Factors Calculator – lists every factor and factor pair of any whole number with the trial-division working shown. Example: factors of 18 → 1, 2, 3, 6, 9, 18.
    • LCM Calculator – finds the least common multiple of any set of whole numbers with prime factorization steps. Example: LCM of 6 and 10 → 30.
    • Prime Number Checker – Check whether a number is prime, see all its factors and prime factorization, and generate lists of primes.
    • Multiplication Chart – Interactive and printable times table chart with practice mode.
    • Simple Calculator – Free basic online calculator with big buttons.
    • Slope Calculator – finds the slope of the line through two points, with all three line forms and both intercepts. Example: points (2, 5) and (9, 19) → slope 2.
    • Midpoint Calculator – finds the point halfway between two points, with the distance and a missing-endpoint mode. Example: points (6, 3) and (12, 7) → midpoint (9, 5).
    • Time Duration Calculator – finds the hours, minutes and seconds between any two dates and times. Example: Jan 1, 2024 10:00 to Jan 2, 2024 12:30 → 1 day, 2 hours, 30 minutes.
    • GPA Calculator – works out your grade point average from letter grades and credit hours on the 4.0 scale. Example: A (3 credits) + B (3 credits) → GPA 3.50.

    Frequently asked questions

    Which calculator should I start with?

    Start with the homepage scientific calculator for general math. Move to a dedicated page when you need its specific output, such as the roots of an equation, a full statistics summary, or an exact age in years, months, and days.

    Do I need an account to use these calculators?

    No. Every calculator on this site runs free in your browser with no sign-up, no download, and no payment.

    Are my numbers sent to a server?

    No. All calculations happen in your own browser. Nothing you type is sent to a server or stored online, which is also explained in the CalcNova FAQ.

    Can I use these calculators on my phone?

    Yes. The calculator pages adjust to smaller screens, so the tools work on phones and tablets as well as on desktop computers.