Calculators for every everyday decision

Free, fast, ad-supported online calculators. No sign-up. Mortgage, BMI, calorie, loan, date and more — all in one oasis.

Finance

Mortgage Calculator

Estimate your monthly home loan payment.

Loan Calculator

Work out payments on personal, auto or any loan.

Health & Fitness

BMI Calculator

Body Mass Index from height and weight.

Calorie & TDEE Calculator

Daily calorie needs (BMR + activity).

Everyday

Date Difference Calculator

Days, weeks and months between two dates.

About CalcOasis

CalcOasis is a free hub of online calculators built for everyday decisions — from buying a home to tracking your fitness goals. Every tool runs entirely in your browser, so your numbers never leave your device. No account is required and the calculations are unlimited.