🧮 Category · 28 tools
Free calculator tools
Money, health, school and home-project calculators. Every tool is free, needs no account and runs in your browser, so your files stay on your device.
Most used
➗ Percentage Calculator
Calculate percentages quickly and easily
🏠 Mortgage & Loan Calculator
Full monthly payment with property tax, insurance, PMI and HOA (PITI), extra-payment savings, payoff date and…
📏 Unit Converter
Convert 15 kinds of units with exact factors
💱 Currency Converter
Convert between currencies with live exchange rates
⚖️ BMI Calculator
Calculate your Body Mass Index instantly
🏦 Loan Calculator
Monthly payment, how much you can borrow or payoff time for a personal loan
All 28 calculator tools
🎂 Age Calculator
Exact age, days between dates, business days, add/subtract dates and countdowns
📈 Compound Interest Calculator
See how your savings grow with monthly contributions
🍽️ Tip Calculator
Calculate the tip and split the bill between people
💰 Paycheck & Salary Calculator
Take-home pay after 2026 federal tax, Social Security and Medicare
🎓 GPA Calculator
Semester and cumulative GPA on the 4.0 scale with +/− grades, weighted Honors/AP, and the grades you need to…
🏷️ Discount Calculator
Sale price after % or $ off, stacked discounts, what % off it was, BOGO and “3 for $10” deals, with optional…
½ Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers with steps; simplify, and convert decimals…
🕘 Time Card Calculator
Add up work hours from clock-in and clock-out times with unpaid breaks, overnight shifts, rounding, overtime…
📝 Grade Calculator
Weighted course grade from percents or points, what you need on the rest of the class, and the final exam…
🔥 Calorie Calculator
Daily calories to maintain, lose or gain weight (TDEE) with Mifflin-St Jeor, Harris-Benedict or…
🏛️ Roman Numeral Converter
Convert numbers to Roman numerals and back with a place-value breakdown, standard-form check, overline…
🧮 Scientific Calculator
Free online scientific calculator with sin, cos, tan, logs, powers, roots, factorials and percent
σ Standard Deviation Calculator
Paste a list of numbers for sample and population standard deviation, variance, mean, median, mode…
🚗 Auto Loan Calculator
Monthly car payment with trade-in, down payment, state sales tax and fees
🏖️ Retirement Calculator (401k)
Project your 401(k) or retirement savings with raises, employer match and the 2026 IRS limit
📏 Body Fat Calculator
Estimate body fat % with the U.S
💳 Credit Card Payoff Calculator
See how long it takes to pay off a credit card and the interest you pay
📐 Square Footage Calculator
Find square feet for rooms, lawns and floors
🧱 Concrete Calculator
How much concrete for a slab, footing, post hole, column or stairs
🍂 Mulch Calculator
How much mulch you need for garden beds and tree rings
🪨 Gravel Calculator
Tons and cubic yards of gravel, crushed stone, pea gravel, river rock or sand for a driveway, path or patio
💵 Sales Tax & VAT Calculator
Add, remove or find sales tax and VAT
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