Speech Therapy Tools
Super Duper Age Calculator — Free Alternative
Generations of SLPs have used the Super Duper age calculator from Super Duper Publications to work out chronological age before scoring. WiseAgeCalc is a free alternative built for the same job: enter a birth date and test date, get exact age in years, months, and days using the ASHA borrowing method.
Same calculation convention, same result — plus visible borrowing steps, an adjusted-age mode for premature infants, and a mobile-first design for the therapy room.
Open the Free Age Calculator
Enter the child's birth date and test date. You get exact age in years, months, and days — copy it straight into your protocol form.
Calculate Age Now →What This Alternative Adds
- ✓Visible borrowing steps. The calculation is shown line by line, so you can verify it or teach the manual method to graduate clinicians.
- ✓Adjusted age for prematurity. Built-in corrected-age calculation for infants born early — required by PLS-5 and Bayley-4 under 24 months. See the prematurity guide.
- ✓Age in total months. One click converts the result to months for early intervention and IFSP paperwork. Age in months calculator.
- ✓Mobile-first. Works in any browser on phone, tablet, or desktop — no download, no login, no account.
SLP Assessments That Require Exact Age
Every norm-referenced speech and language assessment uses chronological age to select the correct norm table. A one-day error can shift a child into a different age band and change the standard score.
Goldman-Fristoe Test of Articulation
Age range: 2;0 – 21;11
One-month norm bands — day-level accuracy matters
Clinical Evaluation of Language Fundamentals
Age range: 5;0 – 21;11
ASHA 30-day method required for cross-month calculation
Preschool Language Scales
Age range: Birth – 7;11
Age in months and days; adjusted age for preemies under 24 months
Peabody Picture Vocabulary Test
Age range: 2;6 – 90+
Age in years and months; full date recorded for report
Expressive Vocabulary Test
Age range: 2;6 – 90+
Co-normed with PPVT-5 — same age calculation
Comprehensive Assessment of Spoken Language
Age range: 3;0 – 21;11
Norm table lookup by years and months
Same ASHA Method, Same Result
Chronological age calculators used in speech therapy — including Super Duper's — follow the ASHA 30-day borrowing convention: when the birth day is larger than the test day, borrow one month and treat it as exactly 30 days before subtracting. WiseAgeCalc applies the identical rule, so the result matches what you are used to.
Example — GFTA-3 Administration
Birth date
2020 / 11 / 28
Test date
2026 / 07 / 06
Age calculator result
5 years, 7 months, 8 days → Age band: 5;7
How to Use It
Enter the child's birth date
Select the birth month, day, and year. Any date back to 1900 is accepted.
Set the test administration date
Enter the exact date you administered the assessment — not the report date. Leave it blank to default to today.
Copy the result to your protocol form
You get exact age in years, months, and days, plus the years;months band (e.g., 5;7) for norm table lookup.
Frequently Asked Questions
What is the Super Duper age calculator?
Super Duper Publications, a well-known speech therapy materials publisher, offers a free online chronological age calculator that many SLPs have used for years. WiseAgeCalc is a free alternative using the same ASHA calculation convention.
Does this calculator give the same result as the Super Duper age calculator?
Yes. Both apply the standard borrowing convention — one month borrowed as 30 days when the birth day exceeds the test day. Given the same dates, the years, months, and days result is the same.
Why use an alternative?
WiseAgeCalc shows the full borrowing steps, includes adjusted age for premature infants, converts to total months for EI paperwork, and is built mobile-first — free, with no account required.
Which speech therapy assessments need exact chronological age?
All norm-referenced SLP assessments: GFTA-3, CELF-5, PLS-5, PPVT-5, EVT-3, CASL-2, and others. Age selects the norm table, so a one-day error can change the standard score.
Is this age calculator really free?
Yes — no login, no subscription, no download. It works in any browser on desktop, tablet, and phone.
Related Guides
Age Calculator for Speech Therapy
How SLPs calculate age for GFTA-3, CELF-5, PPVT-5, and EVT-3.
Pearson Age Calculator
Exact age for WPPSI-IV, Bayley-4, WISC-V, and other Pearson assessments.
How to Calculate Chronological Age
Step-by-step manual method and the ASHA borrowing rule explained.
Prematurity and Corrected Age
How to adjust chronological age for babies born early.