FOC – Free Online Calculators

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FOC logoFree Online Calculators

Fast, accurate and easy-to-use calculators for loans, money and everyday math. No sign-up, and nothing you type is stored.

27 free calculatorsNo sign-upRuns in your browser
Try the Loan Payment Calculator
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Quick loan payment calculator

Loan Payment Calculator
Estimated monthly payment$0.00
Total interest$0.00
Total paid$0.00
Open the full calculator with payment schedule →Need a scientific calculator? Open it here →
Money & WorkLoans · Pay · TaxHealthBMI · Calories · WaterMath & DatesPercent · Dates · Tips

Popular calculators

Scientific CalculatorTrig, logs, powers, roots, factorials and memory keys. Works with your keyboard and on your phone.Open calculator →Loan Payment CalculatorMonthly payment, total interest, payoff date and a full amortization schedule, with an extra-payment option.Open calculator →Compound Interest CalculatorSee how savings and monthly contributions grow over time, with a chart and year-by-year table.Open calculator →Percentage CalculatorFind a percent of a number, percentage change, increase and decrease with step-by-step results.Open calculator →Age CalculatorYour exact age in years, months and days, plus your next birthday and milestone dates.Open calculator →Savings Goal CalculatorFind the monthly amount you need to save to reach a target by a date you choose.Open calculator →Hourly to Salary CalculatorConvert hourly pay to yearly, monthly and weekly pay, or turn a salary into an hourly wage.Open calculator →Discount CalculatorFind the sale price, the original price or the discount percentage, with extra coupons and sales tax.Open calculator →Days Between Dates CalculatorCount the days, weeks and weekdays between two dates, or add days to a date.Open calculator →Weighted Grade CalculatorFind your course grade from scores and weights, and what you need on the final.Open calculator →Tip Calculator & Bill SplitterWork out the tip and split the bill between friends in seconds.Open calculator →Credit Card Payoff CalculatorSee how long it takes to clear your card and how much interest it costs.Open calculator →Debt Snowball & Avalanche CalculatorCompare payoff plans for up to five debts and see your debt-free date.Open calculator →Rule of 72 CalculatorEstimate how long it takes to double your money, or for inflation to halve it.Open calculator →Overtime Pay CalculatorFind your weekly pay with time and a half, double time and bonuses.Open calculator →Self-Employment Tax CalculatorEstimate 2026 Social Security and Medicare tax for freelance and 1099 income.Open calculator →401(k) CalculatorProject your 401(k) balance at retirement with employer match and 2026 IRS limits.Open calculator →Roth IRA CalculatorCheck 2026 Roth IRA income limits and project tax-free retirement savings.Open calculator →Paycheck CalculatorSee your 2026 take-home pay after federal tax, FICA and 401(k).Open calculator →Student Loan CalculatorSee your student loan payment and how extra payments cut time and interest.Open calculator →House Affordability CalculatorFind out how much house you can afford with taxes, insurance and PMI.Open calculator → Budget CalculatorPlan your monthly budget and see how it compares with the 50/30/20 guide.Open calculator → BMI CalculatorFind your body mass index and adult weight category.Open calculator → Ovulation CalculatorEstimate your ovulation date and fertile window.Open calculator → Calorie CalculatorEstimate daily calories, BMR and sample targets.Open calculator → Protein CalculatorFind your daily protein range for your goal.Open calculator →Water Intake CalculatorEstimate how much water and other fluids you need each day, with extra for exercise.Open calculator →

How FOC calculators help

FOC – Free Online Calculators is a collection of simple, accurate tools for everyday money, health and number questions. Whether you are comparing loan payments, planning a monthly budget, estimating take-home pay or checking your BMI, each calculator gives you an instant answer and explains how the result was worked out.

Every calculator page includes a plain-English guide, the formula behind the result, worked examples and answers to common questions, so you can understand the numbers rather than just see them. Calculations run in your browser, nothing you type is stored, and there is nothing to sign up for.

New calculators are added regularly. Use the search box or the categories above to find the one you need, and visit the About page to learn more about how this site is built and maintained. Results are estimates for general information, so check important decisions with a qualified professional.

Why use FOC calculators?

Clear resultsEasy-to-read numbers, charts and tables.
Mobile friendlyWorks smoothly on phones, tablets and computers.
PrivateCalculations run in your browser. Your numbers are never saved.
FreeNo account needed. Always free to use.
Open the Scientific Calculator →

Results are estimates for general information and are not financial advice. See our Terms & Disclaimer.