Free tools that actually work

No signups. No paywalls. No bloat. Just accurate tools you can verify yourself — finance, health, math, and everyday tools with clear explanations of every formula.

Everyday

Everyday

Age Calculator Calculate your exact age in years, months, and days. Find the time between any two dates — perfect for deadlines and milestones. Cooking Converter Convert cooking measurements — cups to grams, tablespoons to teaspoons, fluid ounces to milliliters. For any recipe. Fuel Cost Calculator Calculate fuel cost for a trip. Enter distance, fuel efficiency, and price per gallon or liter to see total fuel cost. Mileage Calculator Calculate vehicle mileage and fuel efficiency. Enter distance and fuel used to get MPG, L/100km, or km/L. Time Card Calculator Calculate work hours from clock in and out times. Handles breaks, overtime, and weekly totals for timesheets. Tip Calculator Calculate tips and split the bill. Enter bill amount, tip percent, and number of people to get per-person totals instantly. Unit Converter Convert between length, weight, temperature, and volume units. Metric to imperial and back — accurate, instant, free.

Finance

Business

Currency Converter Convert between 150+ world currencies with live exchange rates. Free, fast, no signup. Historical rate charts included. Discount Calculator Calculate the final price after a discount. Enter original price and discount percent to see how much you save instantly. Hourly to Salary Calculator Convert hourly wage to annual salary. Enter hourly rate and hours per week to see yearly, monthly, and weekly pay. ROI Calculator Calculate return on investment (ROI). Enter initial cost and final value to see total return, annualized ROI, and profit. Sales Tax Calculator Calculate sales tax on any purchase. Enter price and tax rate to get total cost and tax amount. Works for US, VAT, and GST.

Debt

Credit Card Payoff Calculator Calculate how long it takes to pay off credit card debt. Compare snowball vs avalanche methods and see total interest saved. Early Payoff Calculator See how extra payments shrink your mortgage. Compare biweekly vs lump-sum payoff strategies and find your debt-free date. Loan Amortization Calculator Generate a full amortization schedule for any loan. See principal vs interest breakdown for every payment over the loan term. Mortgage Calculator Calculate your monthly mortgage payment, total interest, and full amortization schedule. Includes taxes, insurance, and PMI options.

Savings

College Savings Calculator Project college savings growth with monthly contributions and compounding interest. See if you are on track for tuition. Compound Interest Calculator See how compound interest grows your money over time. Daily, monthly, or annual compounding with regular contributions. Emergency Fund Calculator Calculate how much emergency savings you need. Based on your monthly expenses and recommended months of coverage. Retirement Calculator Estimate how much you need to retire. Calculate retirement savings, withdrawal rate, and how long your nest egg will last. Savings Goal Calculator Figure out how much to save monthly to reach your goal. Accounts for interest, starting balance, and time horizon.

Health, Math & Science

Health

BMI Calculator Calculate your Body Mass Index (BMI) instantly. Enter height and weight to see your BMI category and healthy weight range. Body Fat Calculator Calculate body fat percentage using the US Navy method. Enter measurements to see your body fat category and lean mass. Calorie Calculator Find your daily calorie needs with the Mifflin-St Jeor equation. TDEE, BMR, and macros for weight loss, maintenance, or muscle gain. Ideal Weight Calculator Find your ideal body weight using Devine, Robinson, Miller, and Hamwi formulas. Based on height and gender. Water Intake Calculator Calculate your recommended daily water intake based on body weight, activity level, and climate. Stay hydrated.

Math

Area Calculator Calculate area for rectangles, triangles, circles, and trapezoids. Enter dimensions to get square units instantly. Average Calculator Calculate the mean, median, and sum of any set of numbers. Enter values separated by commas for instant results. Circle Calculator Find circumference, area, and diameter of a circle from its radius. All circle properties calculated instantly. Grade Calculator Calculate your class grade from weighted assignments and exams. Add assessments, set weights, and see what you need on the final. Percentage Calculator Calculate percentage of a number, percentage change, and percentage difference. All common percentage operations in one tool. Quadratic Equation Solver Solve quadratic equations (ax²+bx+c=0) using the quadratic formula. Shows real and complex roots, step by step. Volume Calculator Calculate volume for cubes, cylinders, spheres, and cones. Enter dimensions to get cubic units instantly.

Science

Density Calculator Calculate density from mass and volume using ρ=m/V. Also solve for mass or volume given density. Metric and imperial. Force Calculator Calculate force using Newton second law (F=ma). Solve for force, mass, or acceleration with multi-unit support. Power Calculator Calculate power using P=W/t or P=Fv. Solve for power, work, time, force, or velocity with multi-unit support. Speed Distance Time Calculator Calculate speed, distance, or time using the formula d=s×t. Solve for any one variable given the other two. Temperature Converter Convert between Celsius, Fahrenheit, and Kelvin instantly. Accurate temperature conversion for any purpose.

This seems like a lot of really specific tools.

Yes.

I've made tools and calculators for every scenario I can think of. I was tired of looking at different websites and just made my own with everything I could think of.