Free Online Calculators
Mortgage, loan, compound interest, BMI, calorie, age, percentage, tip and discount — instant and private, right in your browser.
Money calculators: which one do you need?
Use the mortgage calculator when a down payment and a 15–30 year term are involved — it shows the monthly payment and how much of it is interest. For car, personal, or education loans, the loan calculator handles any amount and term. Saving rather than borrowing? The compound interest calculator shows how deposits grow with monthly, quarterly, or yearly compounding — the difference between 5% simple and 5% compounded monthly over 20 years is real money.
For everyday math, the percentage calculator answers all three forms of "what percent" questions, while the tip calculator splits a restaurant bill (with tip) between any number of people and the discount calculator stacks a percentage off with coupon amounts to give the final sale price.
Health calculators
The BMI calculator uses the WHO formula (weight ÷ height²) in metric or imperial units and maps the result to the standard categories. The calorie calculator estimates your TDEE with the Mifflin-St Jeor equation — the one most dietitians use — then adjusts for your activity level and shows maintenance, cutting, and bulking targets. Both are estimates, not medical advice.
Dates and ages
The age calculator gives your exact age in years, months, and days (handling leap years correctly), plus a countdown to your next birthday — useful for forms that want age on a specific date. Working with pay instead? Try the hourly to salary calculator and time card calculator in our work & money tools.
Frequently Asked Questions
How is the mortgage calculator different from the loan calculator?+
The mortgage calculator is built around home buying: it takes a down payment and shows how principal and interest evolve over 15–30 year terms. The loan calculator is general-purpose — car loans, personal loans, education loans — with any term and a simple payment/interest split.
What formula do the interest calculators use?+
The mortgage and loan calculators use the standard amortization formula M = P·r(1+r)ⁿ/((1+r)ⁿ−1), where r is the monthly rate and n the number of payments. The compound interest calculator uses A = P(1+r/n)^(n·t) with selectable compounding frequency.
Are the BMI and calorie results medical advice?+
No. BMI uses the standard WHO formula (kg/m²) and the calorie calculator uses the Mifflin-St Jeor equation for TDEE — both are screening estimates. They don’t account for muscle mass, pregnancy, or medical conditions; treat them as starting points, not diagnoses.
Is my financial data private?+
Completely. Every calculator runs entirely in your browser — loan amounts, weights, and dates are never uploaded, stored, or sent to any server. You can even use them offline once the page loads.
Are these calculators free?+
Yes — every calculator is free with no signup and no usage limits, on any device.