Calculate anything, instantly.

NumLab offers powerful, free online calculators to help you plan your finances, track your health, optimize investments, and make smarter everyday decisions.

Free & Instant

No sign-up, no fees — get results in seconds.

Accurate Formulas

Built by experts, tested for reliability.

Always Accessible

Use on any device, anywhere.

Private & Secure

Your numbers stay yours — no data tracking.

Popular Categories

Finance & Budgeting

Manage money with budgeting, savings, debt payoff, and goal calculators.

Income & Salary

Track salary, take-home pay, freelance income, and more.

Investing & Wealth

Grow your money with ROI, interest, and wealth planning tools.

Loans & Credit

Calculate loan payments, interest, and credit payoff.

Taxes

Estimate tax returns, withholdings, and deductions.

Health & Fitness

Track BMI, calories, workouts, and fitness goals.

Nutrition & Body Metrics

Measure ideal weight, water intake, macros, and more.

Medical & Wellness

Calculate dosages, health stats, and wellness ranges.

Real Estate & Housing

Plan mortgage payments, rent costs, and affordability.

Retirement Planning

Estimate retirement savings and future income.

Popular Calculators

Savings Goal Planner

Calculate how much to save each month to reach your goal by a target date.

Monthly Savings = (Goal Amount − Current Savings) / Months Until Target Date

Zero-Based Budget Calculator

Allocate your income fully until your remaining balance is zero.

Remaining = Income − Sum of all category amounts

Loan Payment Calculator

Calculate your monthly loan payment based on amount, interest, and term.

M = P × r × (1 + r)^n / ((1 + r)^n − 1)

Debt Snowball Planner

Organize and pay off debts from smallest to largest balance.

Sort debts by balance; apply extra payment to smallest debt first

Debt Avalanche Planner

Organize debts by highest interest rate to minimize total interest paid.

Sort debts by interest rate descending; apply extra payment to highest rate first

Early Payoff Savings Calculator

Estimate how much interest you save by paying off debt early.

Compare total interest with and without extra payments

Debt-to-Income Ratio Calculator

See how your monthly debt compares to your income.

DTI = (Monthly Debt Payments / Gross Monthly Income) × 100

Debt Consolidation Estimator

Compare total payments with and without consolidation.

Compare total cost and interest before and after consolidation

Minimum Payment Time Estimator

Estimate how long it will take to pay off a debt using minimum payments.

Amortized formula for monthly payoff time and total interest

Credit Card Payoff Planner

Plan how long it will take to pay off your credit card balance.

Amortized payoff formula