Online Calculators
Browse fitness, health, finance, math, and everyday calculators. Enter numbers, get an estimate—inputs stay on your device. Not a substitute for professional advice.
Tip Calculator
Find tip amount, total with tip, and equal split per person. Runs locally in your browser — no signup and no data sent to a server.
CalculatorsInstantPercentage Calculator
Solve percent-of, reverse percent, and percent change problems instantly. Processing stays on your device.
CalculatorsInstantDiscount Calculator
Enter the original price and discount percent to see savings and the final price. No signup — runs locally.
CalculatorsInstantGPA Calculator
Add courses with letter grades and credits to get a weighted GPA on the common 4.0 scale. All math stays in your browser.
CalculatorsInstantScientific Calculator
A browser-based scientific calculator for everyday math, trig, and logs. Runs locally — nothing is uploaded.
CalculatorsInstantAverage Calculator
Paste or type a list of numbers to get mean, median, mode, count, and sum. Processing stays on your device.
CalculatorsInstantUnit Price Calculator
Divide total price by quantity to get price per unit — useful for groceries and bulk buys. Runs in your browser.
CalculatorsInstantFuel Cost Calculator
Estimate how much fuel a trip needs and what it costs. Enter distance, efficiency, and price per gallon or liter — all local math.
CalculatorsInstantBMI Calculator
Compute body mass index from height and weight, then see the WHO screening category. Runs locally — not a clinical assessment.
CalculatorsInstantSalary to Hourly Calculator
Convert between annual salary and hourly pay using your hours per week and weeks per year. Gross figures only — no tax withholding.
CalculatorsInstantOvertime Pay Calculator
Estimate gross pay with regular and overtime hours at 1.5× or 2× multipliers. Not payroll or legal advice.
CalculatorsInstantProfit Margin Calculator
Find profit, profit margin, and markup from cost and price — or set a target margin to get the required sell price.
CalculatorsInstantBody Fat Calculator
Estimate body fat percentage from height and circumference measurements using the US Navy method. Private, local math — not a clinical diagnosis.
CalculatorsInstantIdeal Weight Calculator
Get a Devine-formula ideal weight estimate from height and sex. Screening math only — not a health target prescription.
CalculatorsInstantMacro Calculator
Convert a calorie target into protein, carbohydrate, and fat grams using your chosen percentages.
CalculatorsInstantProtein Intake Calculator
Multiply body weight by a grams-per-kilogram factor to estimate daily protein. Not dietary advice.
CalculatorsInstantWater Intake Calculator
Estimate daily fluid volume from body weight using a simple ml-per-kg rule of thumb.
CalculatorsInstantHeart Rate Zone Calculator
Estimate maximum heart rate and five training zones from age using the common 220 − age rule.
CalculatorsInstantSleep Cycle Calculator
Pick a wake-up time and see bedtime options based on ~90-minute cycles plus a short fall-asleep buffer.
CalculatorsInstantRunning Pace Calculator
Enter race or run distance and finish time to get average pace per kilometer and speed.
CalculatorsInstantPregnancy Due Date Calculator
Estimate a due date from the first day of the last menstrual period using Naegele’s rule (LMP + 280 days).
CalculatorsInstantOvulation Calculator
Estimate ovulation and a fertile window from last period date and average cycle length. Not contraception or medical advice.
CalculatorsInstantBreak-Even Calculator
Find how many units you need to sell to cover fixed costs given price and variable cost per unit.
CalculatorsInstantBudget Calculator
Add income and expense lines to see total spending and what remains.
CalculatorsInstantFreelance Rate Calculator
Work out a target hourly rate from desired annual income, yearly expenses, billable hours, and time off.
CalculatorsInstantFraction Calculator
Perform fraction arithmetic and simplify results automatically in your browser.
CalculatorsInstantGCF Calculator
Calculate the greatest common factor of two whole numbers using the Euclidean algorithm.
CalculatorsInstantLCM Calculator
Calculate the least common multiple of two whole numbers from their GCF.
CalculatorsInstantProbability Calculator
Enter probabilities between 0 and 1 for two independent events to get AND and OR results.
CalculatorsInstantCombination Calculator
Compute how many ways to choose r items from n when order does not matter (nCr).
CalculatorsInstantPermutation Calculator
Compute how many ordered arrangements of r items from n (nPr).
CalculatorsInstantZakat Calculator
Estimate zakat from total zakatable wealth and a nisab threshold using a configurable rate (default 2.5%).
CalculatorsInstantGold Zakat Calculator
Estimate zakat on gold holdings from grams, price per gram, and a nisab weight threshold.
CalculatorsInstantSalary After Tax Calculator
Apply a custom tax percentage to gross pay for a quick net estimate. Not official tax software.
CalculatorsInstantElectricity Cost Calculator
Multiply energy use (kWh) by your rate to estimate cost for a period you choose.
CalculatorsInstantCost of Living Calculator
Compare a home-city cost basket to another city’s basket using totals you provide — no external price database.
CalculatorsInstant
These tools are for personal estimates. They are not medical, financial, tax, or legal advice.
How these calculators work
Formulas run in JavaScript in your browser. Health and finance tools include disclaimers because results are estimates only. Read our Disclaimer.
Who these tools are for
Anyone who needs a quick tip, percentage, BMI estimate, or similar calculation without installing an app.
FAQ
Is this medical or financial advice?expand_more
No. See each tool’s disclaimer and our site Disclaimer. Use results for general information only.
Are my inputs uploaded?expand_more
No. Calculations run locally in your browser.
Do I need an account?expand_more
No signup required.
Looking for something else? Browse all tools · Read the blog.