Free Calculator Widgets for Your Website
Add a working calculator to your blog or website in 30 seconds. Copy one snippet, paste it into any HTML block — WordPress, Ghost, Squarespace, Wix, Webflow — and it just works. No signup, no API key, no JavaScript to write, free forever.
How it works
1. Pick a calculator below and click Copy embed code. 2. Paste the snippet into an HTML block on your site. 3. Done — the calculator runs live inside your page, styled to fit a 680px column, served from Cloudflare’s edge. Every calculator on CalcCorp is embeddable: on any calculator page, click the </> Embed button under the tool.
Education & Student Widgets
GPA Calculator
Free GPA calculator showing unweighted and weighted GPA side by side on the 4.0 scale, with credit hours and +…
Final Grade Calculator
Final grade calculator: enter your current grade, the final’s weight and your target. At 84% with a 30% final,…
College GPA Calculator
Free college GPA calculator: enter courses, letter grades and credit hours for your semester GPA on the 4.0 sc…
High School GPA Calculator (Weighted and Unweighted)
Free high school GPA calculator: get weighted and unweighted GPA side by side. Adds +0.5 for Honors and +1.0 f…
Weighted Grade Calculator
Weighted grade calculator: enter category weights and scores. HW 20/92, Quiz 15/85, Midterm 25/78 = 84.4% on c…
Semester Grade Calculator
Free semester grade calculator: enter Q1, Q2 and final exam with editable 40/40/20 weights. Get your semester …
Cumulative GPA Calculator
Cumulative GPA calculator that weights each term by credits — 3.10 over 45 credits plus a 3.60 term of 15 cred…
CGPA Calculator for Indian Students
Free CGPA calculator for Indian students: convert SGPA to CGPA with credit weights, then to percentage using C…
SGPA Calculator (10-Point Grading Scale)
Free SGPA calculator on the Indian 10-point scale (O=10 to F=0). Enter grades and credits per subject to get S…
Attendance Percentage Calculator
Attendance percentage calculator: see your current %, classes needed to reach 75%, and how many you can safely…
Marks Percentage Calculator
Free marks percentage calculator for CBSE and state boards. Add subjects with unequal maximums, see division b…
Class Rank Calculator
Free class rank calculator: enter rank and class size for your top % and percentile. Rank 25 of 320 = top 7.8%…
Craft & Sewing Widgets
Yarn Yardage Calculator
Free yarn yardage calculator: how much yarn you need by project and weight — 1,125–1,625 yds for a worsted swe…
Quilt Calculator
Free quilt calculator that plans the whole project: enter quilt dimensions once to get backing, binding, and b…
Quilt Backing Calculator
Quilt calculator backing guide: yardage with 4-inch overhang, horizontal vs vertical seams on 44-inch fabric, …
Quilt Binding Calculator
Quilt calculator binding guide: perimeter plus 10-12 inches, strip counts from 44-inch fabric, 2.25 vs 2.5 inc…
Quilt Size Chart
Standard quilt dimensions chart from crib to king with US mattress sizes, drop and pillow tuck math, and the l…
Quilt Border Calculator
Free quilt border calculator guide: butted vs mitered strip math, diagonal-seam WOF piecing, and a worked 60x7…
Maker & Hobby Widgets
3D Printing Cost Calculator
Free 3D printing cost calculator: filament, electricity (18.83¢/kWh US avg), depreciation and failure rate. A …
Epoxy Resin Calculator
Epoxy resin calculator for tabletops, river tables, and molds. Converts inches to ounces (divide by 1.805), sp…
Candle Wax Calculator
Free candle wax calculator: water weight × 0.86 gives wax per container, fragrance oil at 6–10% load, and cost…
Board Foot Calculator
Free board foot calculator: thickness × width × length ÷ 12. Board feet per piece, totals, and cost with 2026 …
Firewood Cord Calculator
Free firewood cord calculator — convert stack length, height & depth to full cords (128 cu ft), face cords & d…
Fish Tank Volume Calculator
Free fish tank volume calculator for 6 shapes. US gallons (231 cu in each), liters, UK gallons, water weight a…
Aquarium Substrate Calculator
Free aquarium substrate calculator: pounds, kg, liters, and bag counts from tank footprint and depth. A 20-lon…
Aquarium CO2 Calculator
Free aquarium CO2 calculator: enter KH and pH to get dissolved CO2 in ppm via 3 × KH × 10^(7−pH). Target 20-30…
Voltage Drop Calculator
Free voltage drop calculator for 12V–240V circuits. Uses NEC Table 8 resistance (12 AWG = 1.93 Ω/1,000 ft) to …
Dipole Antenna Calculator
Free dipole antenna calculator: 468 ÷ f MHz gives half-wave length — a 40 m dipole cuts to 65 ft 5 in. Presets…
Homebrewing Widgets
ABV Calculator (Alcohol by Volume)
Free ABV calculator: enter OG and FG for alcohol by volume via (OG − FG) × 131.25 plus a high-gravity formula,…
Keg Carbonation Calculator (Set-and-Forget PSI + Line Length)
Free keg carbonation calculator: enter beer temp and CO2 volumes to get regulator PSI — 2.5 vols at 38°F = 11.…
Priming Sugar Calculator for Bottling Beer
Free priming sugar calculator for bottling beer: batch size, temp, and CO2 target in, grams out. A 5-gallon al…
IBU Calculator
Free IBU calculator using the Tinseth formula. Add up to 3 hop additions for total and per-addition IBUs. Amer…
Hydrometer Temperature Correction Calculator
Hydrometer temperature correction calculator: a 1.050 wort reads just 1.044 at 100°F. Fix readings for 60°F an…
Brix Calculator
Free Brix calculator converts Brix to specific gravity and back — 12 Brix ≈ SG 1.048 — with a wort correction …
Home & Money Widgets
Moving Cost Calculator
Free interstate moving cost calculator: weight × distance linehaul math, $4,000–$9,500 typical for 2–3BR moves…
Piano Moving Cost Calculator (2026)
Estimate piano moving costs for 2026: uprights $150–$400 local, grands $300–$1,000+, stairs $40–$100 per fligh…
Solar Payback Period Calculator (US)
Free US solar payback calculator for 2026. Net cost ÷ annual savings, payback math now the federal credit has …
Estimated Tax Payment Calculator
Q2 estimated tax due date 2026: Monday, June 15. All IRS quarterly tax dates, 100%/110% safe-harbor rules, and…
HSA Contribution Calculator
Calculate HSA contributions growth and tax savings. See how the triple tax advantage makes HSAs the most power…
Why embed a calculator?
Interactive tools keep readers on the page. A quilting blog that embeds the backing calculator answers the reader’s next question without sending them away; a homebrew club site with the ABV and priming widgets becomes the bookmark members return to. The widgets carry a small “Calculator by CalcCorp” credit — that’s the whole price. If you need a calculator we don’t have yet, request it here and we’ll usually build it within a week.