Put free calculators on your website in one line
Pick a ToolNova tool, copy the snippet and paste it into any page. Works on WordPress, Wix, Squarespace, Blogger, Webflow and plain HTML.
- Free forever
- No sign-up or API key
- Resizes to fit your page
Tools you can embed
19 hand-picked tools that run entirely in your visitor's browser, so they load fast and never send their data anywhere.
Percentage & Ratio Calculator
Calculators & ConvertersNine calculators in one: X% of Y, X is what percent of Y, percentage change, add or subtract a percent, reverse percentage, percent difference, percentage points, ratio solver and fraction to percent, with working shown.
BMI Calculator
Calculators & ConvertersBMI calculator with WHO and Asian cut-offs, a live gauge, healthy weight range, US Navy body-fat %, waist ratios, four ideal-weight formulas, BMR and a saved progress chart.
Height Comparison
Calculators & ConvertersCompare heights of people, celebrities, animals and landmarks side by side to scale. Drag to reorder, add photos, shoes and builds, see exact differences, check your height percentile by country and predict a child's adult height.
Age Calculator
Calculators & ConvertersCalculate exact age in years, months and days with live totals, age on any past or future date, next birthday countdown, Hijri (lunar) age, 10,000-day milestones and age difference between two people.
Length Converter
Calculators & ConvertersConvert cm, inches, feet, meters, km and miles plus survey, nautical, typography and astronomy units. Type 5'9" or 1m 75cm, read fractions to 1/64 inch, and export conversion charts.
Temperature Converter
Calculators & ConvertersConvert °C, °F, K, °R, Réaumur, Delisle, Newton and Rømer, switch to Δ mode for temperature differences, and calculate heat index, wind chill and dew point. Includes oven gas marks and a reference chart.
TDEE & Macro Calculator
Calculators & ConvertersCalculate BMR (Mifflin, Harris-Benedict, Katch-McArdle) and TDEE, set a pace in kg or lb per week, and get a macro plan with per-meal targets, water, fiber and a 26-week projection to your goal weight.
Final Grade Calculator
Calculators & ConvertersFind what you need on the final exam for each letter grade, calculate weighted course grades with points or percentages, see the average needed on remaining work, and calculate term and cumulative GPA with honors/AP weighting.
Discount Calculator
Calculators & ConvertersCalculate sale price with stacked % and fixed coupons, tax and quantity; find the discount % or original price; value buy-one-get-one deals; and compare up to 8 deals by unit price.
Days Between Dates Calculator
Calculators & ConvertersCount calendar days, working days and each weekday between two dates with Sat-Sun, Fri-Sat or custom weekends and holidays, or add and subtract years, months, weeks, days or business days.
Tip Calculator
Calculators & ConvertersCalculate the tip and total, split evenly or by what each person ordered, tip on pre-tax or original price, round the total or per person, and check tipping customs in 12 countries.
Loan & EMI Calculator
Finance CalculatorsCalculate loan EMI, total interest and APR, build a full amortization schedule, model prepayments and rate changes, check how much you can borrow and compare loan offers.
GST / VAT / Sales Tax Calculator
Finance CalculatorsAdd or remove GST, VAT or sales tax instantly. Rates for 50+ countries, all US states and Canadian provinces, India CGST/SGST/IGST split, multi-rate bills and reverse rate finder.
Compound Interest Calculator
Finance CalculatorsProject how savings and investments grow with compound interest, regular contributions, step-ups, inflation and tax. Solve for the deposit needed to reach a goal and compare return scenarios.
Hourly to Salary Calculator
Finance CalculatorsFree hourly to salary calculator. Convert hourly wage to annual, monthly, weekly and daily pay (or salary back to hourly) based on your hours per week and weeks per year.
Profit Margin Calculator
Finance CalculatorsCalculate gross margin and markup from any two values, true profit per order after platform fees, ads and returns, your break-even point and how much more you must sell after a discount.
Debt Snowball vs Avalanche Calculator
Finance CalculatorsCompare debt snowball and debt avalanche side by side. Add all your debts, plan extra payments, see your debt-free date, payoff order, interest saved and a month-by-month schedule.
Classroom Seating Chart Generator
Productivity ToolsMake a classroom seating chart in minutes. Paste your class list, pick rows, pairs, groups, round tables, U-shape, circle or draw your own room, then smart-seat students with keep-apart rules, front-row needs and boy/girl or mixed-ability balance. Print, PDF, PNG or CSV. Free, no login.
Zakat Calculator
Islamic ToolsCalculate your Zakat accurately on cash, gold, silver, business assets, investments and crypto. Set the Nisab using live gold or silver prices, deduct debts, and get your exact 2.5% Zakat due, free, private, and no signup.
How it works
- 01
Pick a tool
Choose a calculator or converter that fits your article, lesson or landing page.
- 02
Match your site
Choose light, dark or automatic theme, set a size and add your brand colour. The live preview updates as you go.
- 03
Paste the snippet
Copy the code and paste it into an HTML or custom-code block. That's it: no account, no plugin, no upkeep.
Made to fit on your page
Every embed is the same tool our visitors use, stripped of menus and ads so it looks at home on your site.
Auto height
The frame grows and shrinks with the tool, so there are no inner scrollbars.
Your colours
Light, dark or follow the visitor's system setting, plus a custom accent colour.
Private by design
Calculations run in the browser. No cookies, no tracking and no ads inside the frame.
Lightweight
Lazy-loaded, so the embed doesn't slow down the rest of your page.
Mobile friendly
Layouts adapt from wide desktop columns down to small phone screens.
Free, always
No limits and no paid tier. We only ask that you keep the small credit link.
Who uses ToolNova embeds
Bloggers
Let readers run the numbers right inside your post instead of leaving for another site.
Teachers
Add grade, percentage and unit tools to class pages and learning portals.
Finance sites
Loan, interest, tax and salary calculators that keep visitors on your page.
Health & fitness
BMI and calorie calculators for coaches, gyms and wellness blogs.
Frequently asked questions
Is embedding really free?
Yes. There is no fee, no usage limit and no account. The only condition is that you keep the small ToolNova credit link that comes with the snippet.
Does it work with WordPress, Wix or Blogger?
Yes. Paste the snippet into a Custom HTML block (WordPress), an Embed HTML element (Wix), an HTML/JavaScript gadget (Blogger) or any block that accepts raw HTML.
Will the embed slow down my page?
No. The frame is lazy-loaded, so it only loads when a visitor scrolls near it, and it runs separately from your own page.
What happens to the data visitors enter?
Nothing leaves their browser. The embeddable tools calculate everything locally and carry no ads, analytics or tracking cookies.
Can I embed a tool that isn't listed here?
We only offer tools that run fully in the browser and work well inside a frame. Ask for the one you need and we'll look at adding it.
Don't see the tool you need?
Tell us what your readers would use and we'll consider building it or making it embeddable.