Library
All calculators
Every calculator on Calculator Answers, organized by category.
Education
Grade math for students and parents — final grades, weighted averages, and the score you need on the final.
Education
Final Grade Calculator
Calculate your final course grade from your current grade and your final exam score.
Education
Weighted Grade Calculator
Combine assignments, quizzes, and exams by weight to get a precise weighted course average.
Education
Final Exam Calculator
Find out exactly what you need to score on your final exam to hit your target course grade.
Education
College GPA Calculator
Compute your semester GPA on the standard 4.0 scale — add courses with credit hours and letter grades.
Education
Pythagorean Theorem Calculator
Solve a right triangle for any missing side using a² + b² = c² — enter two sides and we compute the third.
Education
Chronological Age Calculator
Find the exact age between any two dates in years, months, days — plus total months, weeks, and days.
Education
P Value Calculator
Convert a z-score to a p-value for a one-tailed or two-tailed test, with the area on each side of the curve.
Education
Variance Calculator
Compute sample and population variance, mean, count, and standard deviation from a list of numbers.
Education
Integral Calculator
Compute definite integrals of polynomials with the power rule, or numerically with Simpson's rule for safe expressions.
Education
Percentage Increase Calculator
Compute the percentage change between two values — increase or decrease — with absolute change and multiplier.
Education
Derivative Calculator
Differentiate polynomials term by term with the power rule — clear breakdown of each term's derivative.
Education
Standard Deviation Calculator
Compute population and sample standard deviation, variance, mean, and count from a list of numbers.
Home
Project calculators for around the house — concrete and gravel by volume, with bag and tonnage estimates.
Home
Concrete Calculator
Estimate the cubic yards and number of bags of concrete you need for slabs, footings, and columns.
Home
Gravel Calculator
Estimate cubic yards and tons of gravel needed to cover an area at any depth.
Home
Cubic Feet Calculator
Calculate volume in cubic feet from any length, width, and height — supports feet, inches, yards, centimeters, and meters.
Home
Cubic Yard Calculator
Find the cubic yards you need for concrete, gravel, mulch, or soil from length, width, and depth — with weight estimates.
Home
Mulch Calculator
Estimate cubic yards and the number of 2 cu ft and 3 cu ft bags of mulch needed to cover an area.
Home
Square Footage Calculator
Compute square feet, square yards, square meters, and acres from any length and width — for rooms, flooring, walls, or yards.
Money
Quick money math you reach for at the table or the register — tips, splits, and sales tax.
Money
Tip Calculator
Split a bill, calculate a fair tip, and round amounts cleanly across any number of people.
Money
Sales Tax Calculator
Add or remove sales tax from any amount with a precise breakdown of subtotal, tax, and total.
Money
Dividend Calculator
Estimate annual, quarterly, and monthly dividend income from share price, holding size, and dividend yield.
Money
Discount Calculator
Apply a percentage discount to any price and see savings, sale price, and total — with optional sales tax.
Money
Credit Card Payoff Calculator
Estimate how long it takes to pay off a credit card balance and how much interest you'll pay — with extra-payment what-if.
Money
Overtime Calculator
Calculate gross pay from regular and overtime hours at any multiplier (default 1.5×), with effective hourly rate.
Money
Markup Calculator
Find selling price, gross profit, and margin from cost plus markup — or work backwards from cost and selling price.
Money
Roth IRA Calculator
Project the future value of a Roth IRA from current balance, annual contribution, time horizon, and expected return.
Writing
Real-time word and character counts with platform presets, reading times, and limit tracking.
Writing
Word Counter
Count words, characters, sentences, and paragraphs in real time, with reading and speaking time estimates.
Writing
Character Counter
Count characters with and without spaces, plus words, lines, and paragraphs — perfect for limit-bound writing.
Writing
Syllable Counter
Estimate the number of syllables in any text, plus words, sentences, and average syllables per word.
Writing
Sentence Counter
Count sentences, words, and characters in any text, with average words per sentence — useful for editing for flow.
Writing
Readability Calculator
Score any text on Flesch Reading Ease and Flesch-Kincaid Grade Level, with the inputs that drive each formula.
Writing
Words to Minutes Calculator
Convert a word count or pasted script into estimated speaking time at slow, average, fast, or custom speeds.
Writing
Paragraph Counter
Count paragraphs, words, and sentences in any text, with average words per paragraph.
Pets
Modern dog- and cat-age conversions to human years, grounded in current veterinary research.
Pets
Dog Age Calculator
Convert your dog's age to human years using the modern logarithmic formula, with breed-size adjustments.
Pets
Cat Age Calculator
Convert your cat's age to human years using the standard veterinary scale.
Pets
Puppy Weight Calculator
Estimate a puppy's adult weight range from current age, weight, and breed size — honest range, not a false exact figure.
Pets
Dog Food Calculator
Estimate how much food your dog needs each day, based on weight, life stage, activity, and the calories per cup of your food.
Pets
Cat Food Calculator
Estimate how much dry or wet food your cat needs each day, based on weight, life stage, activity, and food calorie density.
Pets
Dog Calorie Calculator
Estimate your dog's daily calorie needs from weight, life stage, activity level, and neuter status — Resting and Daily Energy Requirements.
Pets
Cat Calorie Calculator
Estimate your cat's daily calorie needs from weight, life stage, activity, and indoor or outdoor lifestyle.
Pets
Pet Weight Converter
Convert pet weights between pounds, ounces, kilograms, and grams — useful for food labels, vet records, and weight tracking.
Bible
Gematria and biblical numerology — letter-to-number ciphers with clear, side-by-side breakdowns.
Bible
Gematria Calculator
Compute English, Hebrew, and Greek gematria for any word or phrase across six ciphers, with a letter-by-letter breakdown.
Bible
Hebrew Gematria Calculator
Compute the standard Hebrew gematria value of any Hebrew word or phrase, with a transparent letter-by-letter breakdown.
Bible
Greek Gematria Calculator
Compute the Greek isopsephy value of any Greek word or phrase — accents are normalized — with a letter-by-letter breakdown.
Health
Body-baseline calculators — daily energy expenditure and other estimates grounded in the standard formulas.
Health
TDEE Calculator
Estimate your Total Daily Energy Expenditure from sex, age, height, weight, and activity — with maintenance, cut, and bulk targets.
Health
BMI Calculator
Compute Body Mass Index from height and weight, with the standard category scale and the healthy weight range for your height.
Health
BMR Calculator
Estimate your Basal Metabolic Rate — the calories your body burns at rest — using the Mifflin–St Jeor equation.
Health
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy circumference method, with the standard fitness category scale.
Health
Ideal Weight Calculator
Estimate a healthy weight range from height and sex using the Hamwi, Devine, Robinson, and Miller formulas — and the BMI healthy range.
Health
Macro Calculator
Split a daily calorie target into grams of protein, carbs, and fat with goal-based presets — fat loss, maintenance, or muscle gain.