Free Online Calculators
25 calculators that run entirely in your browser. Nothing you type is uploaded, there is no sign-up, and there are no limits. Looking for image tools instead? They are over here.
Everyday Calculators
Percentages, averages, tips, dates, grades and GPA — the quick ones you reach for and close again.
Basic Calculator
Clean on-screen calculator with keyboard support.
Use Tool →Scientific Calculator
Trig, logs, powers, roots — DEG/RAD switch.
Use Tool →Percentage Calculator
% of a number, ratios & percent change.
Use Tool →Age Calculator
Exact age in years, months, days — and next birthday.
Use Tool →Date Difference Calculator
Days, weeks & months between any two dates.
Use Tool →Average Calculator
Mean, median, min/max & standard deviation.
Use Tool →GPA Calculator
US 4.0-scale GPA from grades & credit hours.
Use Tool →Grade Calculator
Weighted class grade & letter grade, live.
Use Tool →Final Grade Calculator
Exactly what you need on the final exam.
Use Tool →Sunrise & Sunset Calculator
Sunrise, sunset & golden hour for any place and date.
Use Tool →Health & Fitness Calculators
BMI, BMR, body fat, calories, macros and water intake, using the standard published formulas. For general information only — not medical advice.
Calorie Calculator
Daily calorie target for your goal + macro split.
Use Tool →BMI Calculator
Body Mass Index with CDC category & healthy range.
Use Tool →BMR Calculator
Calories you burn at rest, plus every activity level.
Use Tool →Body Fat Calculator
US Navy method — just a tape measure needed.
Use Tool →Macro Calculator
Turn a calorie target into protein/carb/fat grams.
Use Tool →Ideal Weight Calculator
Four medical formulas, one clear answer.
Use Tool →Water Intake Calculator
Personal daily hydration target in L, oz & cups.
Use Tool →Calories Burned Calculator
Calories burned by activity, weight & duration.
Use Tool →Finance Calculators
Loan and mortgage payments, simple and compound interest, take-home pay and discounts. Estimates for planning — not financial advice.
Paycheck Calculator (2026)
Take-home pay after federal, state & FICA taxes — all 50 states.
Use Tool →Loan / EMI Calculator
Monthly payment, total interest & total cost.
Use Tool →Mortgage Calculator
Full monthly payment with tax & insurance.
Use Tool →Compound Interest Calculator
Watch savings grow with monthly contributions.
Use Tool →Simple Interest Calculator
Quick I = P × r × t interest math.
Use Tool →Tip Calculator
Tip, total & fair per-person split.
Use Tool →Discount Calculator
Sale price after % off — even stacked discounts.
Use Tool →