Crochet Increase & Decrease Evenly Calculator: Distribute Stitches Across Any Row
Enter your current stitch count and target stitch count. The calculator returns the exact pattern to distribute increases or decreases evenly — ready to copy into your project notes.
To distribute increases evenly: divide total stitches by number of increases. To distribute decreases: divide total by number of decreases. Example: 30 stitches → 36 (6 increases) means *4 sc, 2 sc in next* × 6. The calculator outputs the ready-to-use pattern.
How even distribution works
When a pattern says "increase 6 evenly across the row," you need to calculate where to place each increase so the work doesn't bunch or ripple at one spot. The formula is: total stitches ÷ number of adjustments = spacing interval. If the result is a whole number, the pattern is clean. If it's a decimal, alternate between two adjacent intervals.
Example: 30 stitches, need 6 increases → 30 ÷ 6 = 5 → increase every 5th stitch → pattern *4 sc, 2 sc in next* × 6 = 36 stitches at row end.
Example with decimal: 32 stitches, need 6 increases → 32 ÷ 6 = 5.33 → alternate between 5 and 6 intervals. The calculator above figures out exactly how many of each.
When to use increases vs decreases
Increases add stitches and widen the fabric. Used for: hat crowns (top-down), garment shaping (waist to bust), flat circle construction, sleeve tapering. The standard abbreviation in crochet is "inc" or "2 sc in next" (work 2 stitches into one stitch).
Decreases remove stitches and narrow the fabric. Used for: hat decreases (bottom-up), garment shaping (bust to waist), amigurumi closure, V-neck shaping. The standard abbreviation is "dec" or "sc2tog" (work 2 stitches together).
Why even distribution matters
Place all 6 increases in the first half of a row and that half ruffles while the second half lies flat. Place all decreases at one edge and you produce a sharp corner instead of a gradual curve. Even distribution produces:
- Smooth shaping — gradual transitions between widths
- No visible "increase line" unless intentional
- Predictable garment fit — bust-to-waist shaping must be even on both sides
- Professional finish — most published patterns assume even distribution
Worked examples
Hat crown closing: 78 stitches → 12 stitches in 8 rounds. Each round decreases by ~8 stitches.
Sweater bust shaping: 120 stitches at waist → 140 at bust over 8 rows. 20 increases ÷ 8 rows = 2-3 increases per row, evenly placed at sides.
Amigurumi sphere: 30 stitches at widest → close to 6 stitches over 5 rounds. Pattern: round 1 = *4 sc, dec* × 5 (25), round 2 = *3 sc, dec* × 5 (20), and so on.
Triangular shawl: increases at both edges (2 per row) and centre spine (2 per row) every right-side row, evenly placed.
Pro tips for clean increases and decreases
- Use stitch markers at each adjustment position before you start the row. Spotting drift is much easier when positions are pre-marked.
- For amigurumi, use the invisible decrease (front loops only) instead of standard sc2tog. Result is gap-free.
- For garments, place increases/decreases at the same column over multiple rows for visible vertical shaping lines (used in raglan shoulder shaping).
- For circles, distribute around the round — don't bunch them on one side.
- If the math produces a decimal, round consistently. The calculator above handles this by alternating between two integer intervals.
Common increase/decrease problems
- "My fabric puckers at one spot": increases not evenly distributed. Recount; spread across the entire row.
- "My decrease leaves a visible gap": using standard sc2tog in amigurumi. Switch to invisible decrease.
- "My circle becomes lopsided": increases not evenly distributed around the round.
- "My garment is asymmetric": shaping not identical on both sides. Mark the first stitch of every row.
Direct answers.
How do I distribute increases evenly across a row?
Divide total stitches by number of increases needed. If 30 stitches need 6 increases, 30 ÷ 6 = 5 — increase every 5th stitch. The pattern becomes *(n-1) sc, 2 sc in next* repeated 6 times. For decimal results, alternate between two intervals.
What's the difference between standard and invisible decrease?
Standard sc2tog leaves a small visible gap. Invisible decrease works only through the FRONT loops of both stitches before the final yarn-over. Result is gap-free, ideal for amigurumi.
Why does my fabric pucker after increasing?
Almost always: increases not evenly distributed. Place them all in one section and that section ruffles while the rest stays flat.
How many stitches should I increase per round on a circle?
For a flat circle in single crochet: exactly 6 per round. For double crochet: 12 per round. Fewer produces cupping; more produces ruffling.
How do I know if my pattern wants me to increase or decrease evenly?
Read the row. 'Inc 6 evenly across' = add 6 stitches. 'Dec 6 evenly' = remove 6. The number in parentheses at the end of the row confirms the final count.
Can I use this calculator for knitting too?
Yes. Knitting uses the same maths for evenly distributed increases (k1f&b, m1) and decreases (k2tog, ssk). Select 'k' as the stitch type.
Sources & further reading
- Craft Yarn Council — Standard Yarn Weight System
- Crochet Guild of America (CGOA) — professional standards
- Clara Parkes, The Knitter's Book of Yarn (Potter Craft) — fibre property reference
- Edie Eckman, The Crochet Answer Book (Storey) — technique reference