Accurate math, plainly explained · 302+ calculator

Your numbers. Your decisions.

200+ calculators that don't just spit out a number — they explain what it means, show the formula and lead you to the right decision. From mortgages to BMI, VAT to tips.

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Accurate

Calculations use standard financial and medical formulas — no hidden fees.

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Private

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Explained

Not just a number — formula, steps, examples and common mistakes.

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Anywhere

Works on phone, tablet, desktop. No install, no signup.

Categories

Finance

29 calculator

Health

27 calculator

Math

28 calculator

Date & Time

20 calculator

Converters

30 calculator

Business

4 calculator

Education

11 calculator

Real estate

6 calculator

Automotive

12 calculator

Lifestyle

9 calculator

Engineering

6 calculator

Statistics

16 calculator

Construction

12 calculator

Cooking

6 calculator

Labor & Payroll

6 calculator

Games & Lottery

14 calculator

AI

5 calculator

Crypto

6 calculator

Sports

6 calculator

Physics

7 calculator

Pregnancy

5 calculator

Electricity

5 calculator

Taxes

5 calculator

Printing & 3D

4 calculator

Packaging

3 calculator

Manufacturing

5 calculator

Fasteners & Bolts

5 calculator

Cables

5 calculator

Engineering Standards

5 calculator

Popular calculators

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Mortgage calculator

Calculates your monthly mortgage payment, total interest paid and full amortization schedule. Shows…

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Loan payment calculator

Computes the monthly payment, total interest and total cost of any personal or consumer loan. Compare bank…

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Car loan calculator

Shows the monthly payment for a car loan given price, down payment, rate and term. Use it before you walk…

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Compound interest calculator

Projects how much your investment will grow over time with compound interest — a lump sum, regular…

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VAT calculator

Adds or removes VAT from an amount in one click. Shows net, VAT amount and gross — essential for…

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Tip calculator

Computes tip and splits the bill fairly between people. Works with any percentage (5–25%) and any currency.

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Discount calculator

Shows final price after discount and how much you actually save. Handles single discounts (30%) or…

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BMI (body mass index) calculator

Calculates Body Mass Index from your height and weight and tells you the WHO category — underweight,…

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Calorie calculator

Estimates daily calorie needs based on sex, age, weight, height and activity level. Shows targets for…

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Percentage calculator

Computes X% of a number, what percent one number is of another, and the % change between two values. The…

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Age calculator

Exact age in years, months, days, hours and minutes from birth date to any target date. Useful for legal…

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Universal unit converter

Universal unit converter — accurate calculation with explanations, formula and examples. Understand how it…

Local context: New Zealand specifics

New Zealand keeps things simple, and Kalkulatora.net reflects that — one GST rate, metric units, no state-level variation.

Key local facts

Local examples

Every figure above applies to New Zealand specifically and is reviewed when the rules change.