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All 60 calculators and reference tables you can add to your site — free. Copy the code for any one in a click, or preview the embed first. Just keep the attribution link.
Financial Calculators
- Amortization Calculator See how each payment splits between principal and interest across the life of a loan.
- Auto Loan Calculator Work out car payments including down payment, trade-in, sales tax and fees.
- Compound Interest Calculator Convert an interest rate between compounding periods — APR to APY and back — so two quotes can be compared on equal terms.
- Credit Card Payoff Calculator Build a debt-avalanche payoff plan for several credit cards from one monthly budget — when each card clears, what it costs, and what to pay on each card every month.
- Home Equity Loan Calculator Estimate borrowing power and payments against your home equity.
- Income Tax Calculator Estimate the refund or amount owed on a 2025 or 2026 federal return, line by line.
- Inflation Calculator Convert an amount between any two months since 1913 with published U.S. CPI data, or project it at a flat rate.
- Interest Calculator Work out the compound interest and final balance on a lump sum plus regular contributions, allowing for tax and inflation.
- Interest Rate Calculator Find the effective interest rate on a loan or investment.
- Investment Calculator Project what a starting amount and regular contributions grow to, with the accumulation schedule year by year and month by month.
- Loan Calculator Calculate the monthly payment, total interest and payoff timeline for any fixed-rate loan.
- Mortgage Calculator Estimate your monthly mortgage payment including principal, interest, property tax, insurance and PMI, and a year-by-year amortization schedule.
- Payment Calculator Calculate the monthly payment or payoff term for a fixed loan.
- Retirement Calculator Estimate whether your savings and contributions will fund your retirement goals.
- Salary Calculator Convert pay between eight frequencies, before and after holidays and vacation days.
- Sales Tax Calculator Fill in any two of before-tax price, tax rate and after-tax price to get the third.
- Savings Calculator Project how regular deposits and interest can grow your savings, or calculate the monthly deposit needed to reach a savings goal.
- Simple Interest Calculator Calculate simple interest and the end balance, or solve back for the principal, term or rate — with the working shown.
- Tip Calculator Calculate the tip, total bill, and amount per person when splitting a bill.
- VAT Calculator Fill in any two of VAT rate, net price, gross price and tax amount to get the other two.
Health & Fitness Calculators
- BMI Calculator Calculate your Body Mass Index (BMI) from height and weight, see your WHO weight category, and your healthy weight range.
- BMR Calculator Estimate your Basal Metabolic Rate — the calories you burn at rest.
- Body Fat Calculator Estimate body fat from tape measurements with the U.S. Navy method, plus mass, category and a BMI estimate.
- Calorie Calculator Find your daily calorie needs for maintaining, losing or gaining weight.
- Due Date Calculator Estimate a pregnancy due date from the last menstrual period.
- Fat Intake Calculator Estimate recommended daily fat intake within your calorie target.
- Ideal Weight Calculator Find a healthy target weight range for your height using established formulas.
- Pace Calculator Calculate running pace and speed from distance and elapsed time, with equivalent finish times for common race distances.
- Pregnancy Calculator Track pregnancy weeks and key milestones.
- Protein Calculator Estimate daily protein needs based on body weight and activity.
- Target Heart Rate Calculator Find your training heart-rate zones from age and resting heart rate.
Math Calculators
- Area Calculator Calculate the area of a rectangle, square, triangle, circle, trapezoid, parallelogram or ellipse.
- Fraction Calculator Add, subtract, multiply and divide fractions with steps.
- Percentage Calculator Calculate percentages, percentage change and percent-of quickly.
- Random Number Generator Generate random numbers within a range, with options for uniqueness.
- Scientific Calculator A free online scientific calculator with trigonometry, logarithms, powers, roots, factorials, memory and constants — works on any device.
- Standard Deviation Calculator Compute the population and sample standard deviation, variance and mean of a data set, step by step.
- Statistics Calculator Calculate mean, median, mode, range, variance, standard deviation and quartiles from a data set, with a full five-number summary.
- Triangle Calculator Calculate a triangle's area, perimeter, angles and classification from three side lengths.
- Volume Calculator Calculate the volume of a cube, box, sphere, cylinder, cone, pyramid or capsule.
Everyday Calculators & Tools
- Age Calculator Calculate exact age in years, months and days from a birth date.
- Concrete Calculator Estimate concrete volume in cubic yards or metres for slabs and footings.
- Date Calculator Add or subtract days from a date, or find the days between two dates.
- GPA Calculator Compute grade point average from course grades and credit hours.
- Grade Calculator Find the grade you need and your weighted course average.
- Hours Calculator Calculate hours worked between two times, minus breaks.
- Password Generator Create strong, random passwords with configurable length and characters.
- Square Footage Calculator Calculate the square footage of a room or area for flooring, paint or landscaping, with a cost estimate.
- Time Calculator Add, subtract and convert units of time.
- Unit Conversion Calculator Convert length, weight, volume, temperature and more.
Reference tables
- Mortgage payment table Monthly principal-and-interest payment per $100,000 of mortgage, for every interest rate from 3% to 8% across 10, 15, 20 and 30-year terms.
- Loan payment table Monthly payment per $1,000 borrowed for auto and personal loans, across interest rates from 4% to 15% and terms from 12 to 72 months.
- Savings growth table How $10,000 grows with compound interest across annual returns of 2% to 10% over 5 to 40 years — a reference for the power of compounding.
- BMI chart The healthy, overweight and obese weight ranges for each height, based on the WHO BMI thresholds (18.5, 25 and 30) — in pounds and kilograms.
- Monthly investment table How a recurring monthly investment grows at a 7% annual return over 10 to 40 years — from $100 to $2,000 a month.
- Salary conversion table Common annual salaries converted to hourly, weekly, biweekly and monthly pay, based on a 40-hour, 52-week year.
- Inflation table What $100 held as cash will be worth in today’s money after 5 to 50 years at annual inflation rates of 2% to 5%.
- Ideal weight chart Ideal body weight for each height, for men and women, as a range across the Robinson, Miller, Devine and Hamwi formulas.
- Target heart rate chart Maximum heart rate and the light, moderate and hard training zones (in bpm) for every age from 20 to 70.
- Tip chart The tip amount for common bill totals at 15%, 18%, 20% and 25% — a quick gratuity reference for restaurants and services.